Document:

EX-10.9

Exhibit 10.9

CHANGE IN CONTROL SEVERANCE AGREEMENT

This Change in Control Severance Agreement (the “Agreement”) is dated as of December
31, 2010 (the “Effective Date”), by and between Hubbell Incorporated, a Connecticut
corporation (the “Company”), and William T. Tolley (the “Executive”).

WHEREAS, the Company’s Board of Directors (the “Board”) considers the continued
services of key executives of the Company to be in the best interests of the Company and its
stockholders;

WHEREAS, the Board desires to assure, and has determined that it is appropriate and in the
best interests of the Company and its stockholders to reinforce and encourage, the continued
attention and dedication of key executives of the Company to their duties of employment without
personal distraction or conflict of interest in circumstances which could arise from the occurrence
of a Change in Control (as defined below);

WHEREAS, the Company’s Board of Directors has authorized the Company to enter into change in
control severance agreements with those key executives of the Company and any of its respective
subsidiaries (all of such entities, with the Company hereinafter referred to as an
“Employer”), such agreements to set forth the severance compensation which the Company
agrees under certain circumstances to pay such executives;

WHEREAS, the Executive is a key executive of an Employer and has been designated by the Board
as an executive to be offered such a change in control severance agreement with the Company;

WHEREAS, the Executive was previously entitled to receive certain severance benefits following
a Change in Control pursuant to that certain Amended and Restated Continuity Agreement dated as of
November 1, 2007 by and between the Company and the Executive(the “Prior Agreement”); and

WHEREAS, effective as of the Effective Date, the Company and the Executive desire to terminate
the Prior Agreement and enter into this Agreement, which shall supersede the Prior Agreement in its
entirety.

NOW, THEREFORE, in consideration of the premises and the mutual covenants and agreements
contained herein and other good and valuable consideration, the receipt and sufficiency of which is
hereby acknowledged, the Company and the Executive agree as follows:

1. Certain Definitions. As used in this Agreement, the following terms shall have the
following meanings:

(a) “Agreement” shall have the meaning set forth in the preamble hereto.

(b) “Benefit Continuation Period” shall mean the 30 month period immediately following
the date of the Qualifying Event.

(c) “Board” shall have the meaning set forth in the recitals hereto.

(d) “Bonus” shall mean the average of the actual bonuses paid or payable to the
Executive under any Company annual incentive compensation plans for the three consecutive fiscal
year period immediately prior to the year in which the Change in Control occurs.

(e) “Cause” shall mean:

(i) the willful and continued failure of the Executive to perform substantially all of his
duties with an Employer (other than any such failure resulting from Disability), after a written
demand for substantial performance is delivered to the Executive by the Board which specifically
identifies the manner in which the Board believes that the Executive has not substantially
performed his duties;

(ii) the willful engaging by the Executive in gross misconduct which is materially and
demonstrably injurious to the Company or any Employer; or

(iii) the conviction of, or the plea of guilty or nolo contendere to, a
felony;

provided that a termination of the Executive for Cause shall be made by delivery to the
Executive of a copy of a resolution duly adopted by the affirmative vote of not less than a
three-fourths majority of the non-employee directors of the Company or of the ultimate parent of
the entity which caused the Change in Control (if the Company has become a subsidiary) at a meeting
of such directors called and held for such purpose, after 30 days prior written notice to the
Executive specifying the basis for such termination and the particulars thereof and a reasonable
opportunity for the Executive to cure or otherwise resolve the behavior in question prior to such
meeting, finding that in the reasonable judgment of such directors, the conduct or event set forth
in any of clauses (i), (ii) or (iii) above has occurred and that such occurrence warrants the
Executive’s termination.

(f) “Change in Control” shall mean any one of the following:

(i) Continuing Directors during any 12 month period no longer constitute a majority of the
Directors;

(ii) any person, or persons acting as a group (within the meaning of Treas. Reg.
§1.409A-3(i)(5)(vi)(D)), acquires (or has acquired within the 12 month period ending on the date of
the last acquisition by such person or persons), directly or indirectly, thirty percent (30%) or
more of the voting power of the then outstanding securities of the Company entitled to vote for the
election of Directors; provided that this Section 1(f)(ii) shall not apply with respect to
any acquisition of securities by (A) the trust under a Trust Indenture dated September 2, 1957 made
by Louie E. Roche, (B) the trust under a Trust Indenture dated August 23, 1957 made by Harvey
Hubbell, and (C) any employee benefit plan (within the meaning of Section 3(3) of the Employee
Retirement Income Security Act of 1974, as amended) maintained by the Company or any affiliate of
the Company;

(iii) any person, or persons acting as a group (within the meaning of Treas. Reg.
§1.409A-3(i)(5)(v)(B)), acquires ownership (including any previously owned securities) of more than
fifty percent (50%) of either (x) the voting power value of the then outstanding securities of the
Company entitled to vote for the election of Directors or (y) the fair market value of the Company;
provided that this Section 1(f)(iii) shall not apply with respect to any acquisition of
securities by (A) the trust under a Trust Indenture dated September 2, 1957 made by Louie E. Roche,
(B) the trust under a Trust Indenture dated August 23, 1957 made by Harvey Hubbell, and (C) any
employee benefit plan (within the meaning of Section 3(3) of the Employee Retirement Income
Security Act of 1974, as amended) maintained by the Company or any affiliate of the Company; or

(iv) a sale of substantially all of the Company’s assets;

provided that the transaction or event described in Section 1(f)(i), (ii), (iii) or (iv)
constitutes a “change in control event” as defined in Treas. Reg. §1.409A-3(i)(5).

(g) “Code” shall mean the Internal Revenue Code of 1986, as amended.

(h) “Company” shall have the meaning set forth in the preamble hereto.

(i) “Continuing Director” shall mean any individual who is a member of the Board on
December 9, 1986 or was designated (before such person’s initial election as a Director) as a
Continuing Director by 2/3 of the then Continuing Directors.

(j) “Director” shall mean an individual who is a member of the Board on the relevant
date.

(k) “Disability” shall mean the Executive’s absence from the full-time performance of
the Executive’s duties (as such duties existed immediately prior to such absence) for 180
consecutive business days, when the Executive is disabled as a result of incapacity due to physical
or mental illness.

(l) “Effective Date” shall have the meaning set forth in the preamble hereto.

(m) “Employer” shall have the meaning set forth in the recitals hereto.

(n) “Excise Tax” shall have the meaning set forth in Section 7.

(o) “Executive” shall have the meaning set forth in the preamble hereto.

(p) “Good Reason” shall mean the occurrence, within the term of this Agreement, of any
of the following without the Executive’s express written consent:

(i) after a Change in Control, any material reduction in the Executive’s base salary from that
which was in effect immediately prior to the Change in Control, any material reduction in the
Executive’s annual cash bonus below such bonus paid or payable in respect of the calendar year
immediately prior to the year in which the Change in Control occurs, or any material reduction in
the Executive’s aggregate annual cash compensation (including base salary and bonus) from that
which was in effect immediately prior to the Change in Control;

(ii) any material and adverse diminution in the Executives’ duties, responsibilities, status,
position or authority with the Company or any of its affiliates following a Change in Control;
provided, however, that no such diminution shall be deemed to exist solely because
of changes in the Executive’s duties, responsibilities or titles as a consequence of the Company
ceasing to be a company with publicly-traded securities or becoming a wholly-owned subsidiary of
another company;

(iii) any relocation of the Executive’s primary workplace to a location that is more than 35
miles from the Executive’s primary workplace as of the date immediately prior to the Change in
Control; or

(iv) any failure by the Company to obtain from any successor to the Company an agreement
reasonably satisfactory to the Executive to assume and perform this Agreement, as contemplated by
Section 13(a) hereof;

provided that, notwithstanding the foregoing, the Executive may not resign his employment
for Good Reason unless (x) the Executive provides the Company with at least 30 days prior written
notice of his intent to resign for Good Reason (which notice is provided not later than the
60th day following the occurrence of the event constituting Good Reason) and (y) the
Company does not cure or resolve the behavior otherwise constituting Good Reason within such 30 day
period.

(q) “Notice of Termination” shall have the meaning set forth in Section 3(c).

(r) “Other Agreement” shall have the meaning set forth in Section 12(b).

(s) “Parachute Value” shall mean of a Payment shall mean the present value as of the
date of the Change in Control for purposes of Section 280G of the Code of the portion of such
Payment that constitutes a “parachute payment” under Section 280G(b)(2) of the Code, as determined
for purposes of determining whether and to what extent the Excise Tax will apply to such Payment.

(t) “Payment” shall have the meaning set forth in Section 7.

(u) “Prior Agreement” shall have the meaning set forth in the recitals hereto.

(v) “Qualifying Event” shall have the meaning set forth in Section 4.

(w) “Release” shall have the meaning set forth in Section 5(a).

(x) “Release Expiration Date” shall have the meaning set forth in Section 5(a).

(y) “Retirement” shall mean the Executive’s voluntary Separation from Service pursuant
to late, normal or early retirement under a pension plan sponsored by an Employer, as defined in
such plan, but only if such retirement occurs prior to a termination by an Employer without Cause
or by the Executive for Good Reason.

(z) “Safe Harbor Amount” shall mean 2.99 times the Executive’s “base amount,” within
the meaning of Section 280G(b)(3) of the Code.

(aa) “Section 409A” shall mean Section 409A of the Code and the Department of Treasury
regulations and other interpretive guidance issued thereunder.

(bb) “Separation from Service” shall have the meaning set forth in Section 3(b).

(cc) “Severance Multiple” shall mean 2.50; provided, however, that
notwithstanding the foregoing, for each full month that elapses during the period beginning on the
date the Executive attains age 63 and ending on the date the Executive attains age 65, the
Severance Multiple shall be reduced by an amount equal to the product of (i) 1/24 and (ii) the
excess of (A) the original Severance Multiple set forth above over (B) 1.0 (rounded to the nearest
hundredth).

(dd) “Supplemental Retirement Plan” shall mean (i) the Company’s Amended and Restated
Supplemental Executive Retirement Plan, (ii) the Company’s Supplemental Management Retirement Plan,
(iii) the Company’s Amended and Restated Top Hat Restoration Plan, and (iv) the Company’s Defined
Contribution Restoration Plan.

(ee) “Target Bonus” shall have the meaning set forth in Section 4(b)(i)(C).

2. Term. This Agreement shall become effective on the Effective Date and shall remain
in effect until the first anniversary of the Effective Date; provided, however,
that this Agreement shall automatically renew on each successive anniversary of the Effective Date
unless an Employer provides the Executive, in writing, at least 90 days prior to the renewal date,
notice that this Agreement shall not be renewed; provided, further, that such
notice of non-renewal may not be provided at any time following the date an agreement is signed by
the Company which, if consummated, would result in a Change in Control. Notwithstanding the
foregoing, in the event that a Change in Control occurs at any time prior to the termination of
this Agreement in accordance with the preceding sentence, this Agreement shall not terminate until
the second anniversary of the Change in Control (or, if later, the second anniversary of the
consummation of the transaction(s) contemplated in the Change in Control).

3. Eligibility for Compensation.

(a) Change in Control. No compensation or other benefit pursuant to Section 4 hereof
shall be payable under this Agreement unless and until either:

(i) a Change in Control shall have occurred while the Executive is an employee of an Employer
and the Executive’s employment by an Employer thereafter shall have terminated in accordance with
Section 3(b)(i) hereof; or

(ii) the Executive’s employment by an Employer shall have terminated in accordance with
Section 3(b)(ii) hereof prior to the occurrence of a Change in Control.

(b) Termination of Employment. The Executive shall be entitled to the compensation
provided for in Section 4 hereof if:

(i) within two years after a Change in Control, the Executive’s employment is terminated (A)
by an Employer for any reason other than (I) the Executive’s Disability or Retirement, (II) the
Executive’s death or (III) for Cause, or (B) by the Executive with Good Reason; or

(ii) (A) an agreement is signed which, if consummated, would result in a Change in Control,
(B) the Executive’s employment is terminated by an Employer without Cause or by the Executive with
Good Reason prior to the consummation of such Change in Control, (C) the Executive’s termination of
employment is at the direction of the acquiror or merger partner or otherwise in connection with
the anticipated Change in Control, and (D) such Change in Control actually occurs;

provided that the Executive’s termination of employment described in Section 3(b)(i) or
3(b)(ii) constitutes a “separation from service” (within the meaning of Treas. Reg. §1.409A-1(h))
(a “Separation from Service”).

(c) Notice of Termination. Any purported termination of the Executive’s employment
(other than on account of the Executive’s death) with an Employer shall be communicated by a Notice
of Termination to the Executive, if such termination is by an Employer, or to an Employer, if such
termination is by the Executive. For purposes of this Agreement, “Notice of Termination”
shall mean a written notice which shall indicate the specific termination provision in this
Agreement relied upon and shall set forth in reasonable detail the facts and circumstances claimed
to be a basis for termination of the Executive’s employment under the provisions so indicated. For
purposes of this Agreement, no purported termination of the Executive’s employment with an Employer
shall be effective without such a Notice of Termination having been given.

4. Compensation upon Qualifying Termination. Subject to the Executive’s execution and
non-revocation of a Release pursuant to Section 5(a), upon the date of (x) the Executive’s
termination of employment pursuant to Section 3(b)(i) or (y) the consummation of a Change in
Control pursuant to Section 3(b)(ii) (each, a “Qualifying Event”), the Executive shall
become entitled to receive the following payments and benefits at the time set forth in Section
5(b):

(a) Severance. The Company shall pay or cause to be paid to the Executive a cash
severance amount equal to the product of (i) the Severance Multiple and (ii) the sum of (A) the
Executive’s annual base salary on the date of the Change in Control (or, if higher, the annual base
salary in effect immediately prior to the giving of the Notice of Termination), and (B) the
Executive’s Bonus. This cash severance amount shall be payable in a lump sum calculated without
any discount.

(b) Additional Payments and Benefits. The Executive shall also be entitled to
receive:

(i) a lump-sum cash payment equal to the sum of (A) the Executive’s accrued but unpaid base
salary through the date of Separation from Service, (B) the unpaid portion, if any, of bonuses
previously earned by the Executive pursuant to any Company annual incentive compensation plans, (C)
the pro rata portion of 100% of the Executive’s then-current target bonus (as previously
established by the Compensation Committee) (the “Target Bonus”), calculated through the
date of the Qualifying Event, and (D) an amount equal to any accrued vacation pay, in each case in
full satisfaction of the Executive’s rights thereto;

(ii) a lump-sum cash payment equal to the excess of (A) the present value of the payments that
the Executive would be entitled to receive under the Supplemental Retirement Plans in which the
Executive is eligible to participate immediately prior to the Qualifying Event, assuming that the
Executive receives (1) additional service credit for purposes of eligibility, vesting and benefit
accrual under such Supplemental Retirement Plans, to the extent applicable, with respect to the
number of months equal to the Benefit Continuation Period and (2) additional age credit under such
Supplemental Retirement Plans with respect to the number of months equal to the Benefit
Continuation Period solely to the extent applicable for purposes of calculating any early
retirement reduction (in each case, calculated using the assumptions set forth under such
Supplemental Retirement Plans) over (B) the present value of the payments that the Executive would
be entitled to receive under such Supplemental Retirement Plans absent the additional service and
age credit credited pursuant to Sections 4(b)(ii)(A)(1) and (2);

(iii) continued medical, dental, vision and life insurance coverage (excluding accident, death
and disability insurance) for the Executive and the Executive’s eligible dependents or, to the
extent such coverage is not commercially available, such other arrangements reasonably acceptable
to the Executive, on the same basis as in effect immediately prior to the Change in Control or the
Qualifying Termination, whichever is deemed to provide for more substantial benefits, during the
Benefit Continuation Period; provided that the amount of benefits the Executive receives in
any one year shall not affect the amount of benefits he may receive in any subsequent year; and

(iv) all other accrued or vested benefits and any compensation previously deferred in
accordance with the terms of the applicable plan.

(c) Outplacement. If so requested by the Executive, outplacement services shall be
provided for a period of one year by a professional outplacement provider selected by the
Executive; provided, however, that such outplacement services shall be provided to
the Executive at a cost to the Company of not more than fifteen percent (15%) of the Executive’s
annual base salary immediately prior to the Qualifying Event.

5. Release; Timing of Payment; Withholding.  

(a) Payments and benefits provided pursuant to Section 4 are conditioned on the Executive’s
execution and non-revocation of a release of claims agreement and covenant not to sue in
substantially the form attached hereto as Exhibit A (a “Release”). The Company
shall deliver the Release to the Executive within seven (7) days following the date of the
Qualifying Event (and the Company’s failure to deliver a Release prior to the expiration of such
seven (7) day period shall constitute a waiver of any requirement to execute a Release) and the
Executive shall be required to execute the Release on or prior to the Release Expiration Date. If
the Executive fails to execute the Release on or prior to the Release Expiration Date or timely
revokes his acceptance of the Release thereafter, the Executive shall not be entitled to receive
any of the payments and benefits provided pursuant to Section 4. For purposes of this Agreement,
“Release Expiration Date” shall mean the date that is 21 days following the date upon which
the Company timely delivers the Release to the Executive, or, in the event that the Executive’s
termination of employment is “in connection with an exit incentive or other employment termination
program (as such phrase is defined in the Age Discrimination in Employment Act of 1967), the date
that is 45 days following such delivery date.

(b) Except as otherwise provided in Section 10, all lump sum payments under Section 4 shall be
paid on the first payroll date to occur on or after the 60th day following the
Qualifying Event. For the avoidance of doubt, to the extent that the Executive is entitled to
receive any lump sum payments with reference to any Supplemental Retirement Plans in connection
with the Qualifying Event, pursuant to Section 4(b)(ii), the present value of his Supplemental
Retirement Plan benefit(s) shall be calculated under the terms of the applicable Supplemental
Retirement Plans and, for purposes of determining the lump-sum payment under Section 4(a)(ii), such
calculation of present value shall include any additional age and service credit provided pursuant
to Section 4(b)(ii).

(c) Payments and benefits provided pursuant to Section 4 shall be subject to any applicable
payroll and other taxes required to be withheld.

6. Compensation upon Death, Disability or Retirement. If the Executive’s employment
is terminated by reason of death, Disability or Retirement prior to any other termination, the
Executive will be entitled to receive:

(a) the sum of (i) the Executive’s accrued but unpaid salary through the date of such
termination, (ii) a pro-rata portion of the Executive’s Target Bonus for the year in which the
Executive’s employment is terminated due to death or Disability (calculated through the date of
such termination), and (iii) an amount equal to any accrued vacation pay; and

(b) other accrued or vested benefits and any compensation previously deferred in accordance
with the terms of the applicable plans.

7. Excess Parachute Payments. If it is determined (as hereafter provided) that any
payment or distribution by the Company or any Employer to or for the benefit of the Executive,
whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or
otherwise pursuant to or by reason of any other agreement, policy, plan, program or arrangement,
including without limitation any stock option, stock appreciation right or similar right, or the
lapse or termination of any restriction on or the vesting or exercisability of any of the foregoing
(a “Payment”) would be subject to the excise tax imposed by Section 4999 of the Code (or
any successor provision thereto) by reason of being “contingent on a change in ownership or
control” of the Company, within the meaning of Section 280G of the Code (or any successor provision
thereto) or to any similar tax imposed by state or local law, or any interest or penalties with
respect to such excise tax (such tax or taxes, together with any such interest or penalties, are
hereafter collectively referred to as the “Excise Tax”), then, in the event that the
after-tax value of all Payments to the Executive (such after-tax value to reflect the deduction of
the Excise Tax and all income or other taxes on such Payments) would, in the aggregate, be less
than the after-tax value to the Executive of the Safe Harbor Amount, (a) the cash portions of the
Payments payable to the Executive under this Agreement shall be reduced, in the order in which they
are due to be paid, until the Parachute Value of all Payments paid to the Executive, in the
aggregate, equals the Safe Harbor Amount, and (b) if the reduction of the cash portions of the
Payments, payable under this Agreement, to zero would not be sufficient to reduce the Parachute
Value of all Payments to the Safe Harbor Amount, then any cash portions of the Payments payable to
the Executive under any other agreements, policies, plans, programs or arrangements shall be
reduced, in the order in which they are due to be paid, until the Parachute Value of all Payments
paid to the Executive, in the aggregate, equals the Safe Harbor Amount, and (c) if the reduction of
all cash portions of the Payments, payable pursuant to this Agreement or otherwise, to zero would
not be sufficient to reduce the Parachute Value of all Payments to the Safe Harbor Amount, then
non-cash portions of the Payments shall be reduced, in the order in which they are due to be paid,
until the Parachute Value of all Payments paid to the Executive, in the aggregate, equals the Safe
Harbor Amount. All calculations under this section shall be determined by the Company and the
Company’s outside auditors.

8. Expenses. In addition to all other amounts payable to the Executive under this
Agreement, during the term of this Agreement and for a period of twenty (20) years following the
Qualifying Event, the Company shall pay or reimburse the Executive for legal fees (including,
without limitation, any and all court costs and attorneys’ fees and expenses) incurred by the
Executive in connection with or as a result of any claim, action or proceeding brought by the
Company or the Executive with respect to or arising out of this Agreement or any provision hereof;
provided, however, that in the case of an action brought by the Executive, the
Company shall have no obligation for any such legal fees if the Company is successful in
establishing with the court that the Executive’s action was frivolous or otherwise without any
reasonable legal or factual basis. All such expenses shall be reimbursed by December 31 of the
year following the year in which the expense was incurred. The amount of expenses reimbursed in
one year shall not affect the amount eligible for reimbursement in any subsequent year.

9. Offsets. Notwithstanding anything to the contrary in this Agreement, to the extent
that the Executive receives severance or similar payments and/or benefits under any other Company
plan, program, agreement, policy, practice or arrangement, or under the WARN Act or similar state
law, the payments and benefits due to the Executive under this Agreement will be correspondingly
reduced on a dollar-for-dollar basis.

10. Section 409A Delay. Notwithstanding anything to the contrary in this Agreement,
if the Company determines that the Executive is deemed at the time of his Separation from Service
to be a “specified employee” for purposes of Section 409A(a)(2)(B)(i) of the Code, to the extent
delayed commencement of the payment of any portion of the amounts to which the Executive is
entitled under this Agreement is required in order to avoid a prohibited distribution under Section
409A(a)(2)(B)(i) of the Code, then such portion shall not be provided to the Executive prior to the
earlier of (a) the expiration of the six-month period measured from the date of the Executive’s
Separation from Service or (b) the date of the Executive’s death. Upon the expiration of the
applicable deferral period under Section 409A(a)(2)(B)(i) of the Code, all payments deferred
pursuant to this Section 10 shall be paid in a lump sum to the Executive, plus interest thereon
from the date of the Executive’s Separation from Service through the payment date at a rate equal
to the prime rate of interest as reported in the Wall Street Journal from time to time. Any
remaining payments due under this Agreement shall be paid as otherwise provided herein.

11. Obligations Absolute; Non-Exclusivity of Rights; Joint and Several Liability.

(a) The obligations of the Company to make the payment to the Executive and to make the
arrangements provided for herein shall be absolute and unconditional and, except as provided in
Section 7 or 9, shall not be reduced by any circumstances, including, without limitation, any
set-off, counterclaim, recoupment, defense or other right which the Company may have against the
Executive or any third party at any time.

(b) Nothing in this Agreement shall prevent or limit the Executive’s continuing or future
participation in any benefit, bonus, incentive or other plan or program provided by the Company or
any other Employer and for which the Executive may qualify, nor shall anything herein limit or
reduce such rights as the Executive may have under any agreements with the Company or any other
Employer.

(c) Each entity included in the definition of “Employer” and any successors or assigns shall
be jointly and severally liable with the Company under this Agreement.

12. Not an Employment Agreement; Effect on Other Rights.

(a) This Agreement is not, and nothing herein shall be deemed to create, a contract of
employment between the Executive and the Company. Any Employer may terminate the employment of the
Executive at any time, subject to the terms of this Agreement and/or any employment agreement or
arrangement between an Employer and the Executive that may then be in effect.

(b) With respect to any employment agreement with the Executive in effect immediately prior to
a Change in Control, nothing herein shall have any effect on the Executive’s rights thereunder;
provided, however, that in the event of the Executive’s termination of employment
in accordance with Section 3(b) hereof, this Agreement shall govern solely for the purpose of
providing the terms of all payments and additional benefits to which the Executive is entitled upon
such termination and any payments or benefits provided under any employment agreement with the
Executive in effect immediately prior to the Change in Control shall reduce the corresponding type
of payments or benefits hereunder. Notwithstanding the foregoing, in the event that the
Executive’s employment is terminated prior to the occurrence of a Change in Control under the
circumstances provided for in Section 3(b)(ii) and such circumstances also entitle the Executive to
payments and benefits under any other employment or other agreement as in effect prior to the
Change in Control (and “Other Agreement”), then, until the Change in Control occurs, the
Executive will receive the payments and benefits to which he is entitled under such Other
Agreement. Upon the occurrence of the Change in Control, the Company will pay to the Executive in
cash the amount to which he is entitled under this Agreement (reduced by the amounts already paid
under the Other Agreement) in respect of cash payments and shall provide or increase any other
noncash benefits to those provided for hereunder (after taking into account noncash benefits, if
any, provided under such Other Agreement). Amounts which are vested benefits or which the
Executive is otherwise entitled to receive under any plan or program of the Company or any other
Employer shall be payable in accordance with such plan or program, except as explicitly modified by
this Agreement.

13. Successors; Binding Agreement; Assignment.

(a) The Company shall require any successor (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to all or substantially all of the business of the Company, by
agreement to expressly, absolutely and unconditionally assume and agree to perform this Agreement
in the same manner and to the same extent that the Company would be required to perform it if no
such succession had taken place. Failure of the Company to obtain such agreement prior to the
effectiveness of any such succession shall be a material breach of this Agreement and shall entitle
the Executive to terminate the Executive’s employment with the Company or such successor for Good
Reason immediately prior to or at any time after such succession. Upon and following the
assumption of this Agreement by a successor, “Company,” as used in this Agreement, shall mean (i)
the Company (as defined above), and (ii) any successor to all the stock of the Company or to all or
substantially all of the Company’s business or assets which executes and delivers an agreement
provided for in this Section 13(a) or which otherwise becomes bound by all the terms and provisions
of this Agreement by operation of law, including any parent or subsidiary of such a successor.

(b) This Agreement shall inure to the benefit of and be enforceable by the Executive’s
personal or legal representatives, executors, administrators, successors, heirs, distributes,
devisees and legatees. If the Executive should die while any amount would be payable to the
Executive hereunder if the Executive had continued to live, all such amounts, unless otherwise
provided herein, shall be paid in accordance with the terms of this Agreement to the Executive’s
estate or designated beneficiary. Neither this Agreement nor any right arising hereunder may be
assigned or pledged by the Executive.

14. Notice. For purposes of this Agreement, notices and all other communications
provided for in this Agreement or contemplated hereby shall be in writing and shall be deemed to
have been duly given when personally delivered, delivered by a nationally-recognized overnight
delivery service or when mailed United States certified or registered mail, return receipt
requested, postage prepaid, and addressed, in the case of the Company, to the Company at:

Hubbell Incorporated

40 Waterview Drive

P.O. Box 1000

Shelton, Connecticut 06484

Attention: General Counsel

and, in the case of the Executive, to the Executive at the address set forth on the execution page
at the end hereof.

Either party may designate a different address by giving notice of change of address in the
manner provided above, except that notices of change of address shall be effective only upon
receipt.

15. Restrictive Covenants; Confidentiality.

(a) All payments and benefits provided under Section 4 are conditioned on and subject to the
Executive’s continuing compliance with this Agreement and any other agreements regarding
non-competition and non-solicitation of employees and customers.

(b) The Executive shall retain in confidence any and all confidential information concerning
the Company and its respective business which is now known or hereafter becomes known to the
Executive, except as otherwise required by law and except information (i) ascertainable and easily
obtained from public information, (ii) received by the Executive at any time after the Executive’s
employment by the Company shall have terminated, from a third party not employed by or otherwise
affiliated with the Company, or (iii) which is or becomes known to the public by any means other
than a breach of this Section 15(b). Upon the termination of his employment, the Executive will
not take or keep any proprietary or confidential information or documentation belonging to the
Company.

16. Entire Agreement; Amendments; No Waiver.

(a) This Agreement contains the entire understanding of the parties with respect to the
subject matter described herein, and no agreements or representations, oral or otherwise, express
or implied, with respect to the subject matter hereof have been made by either party which are not
expressly set forth in this Agreement. The Executive represents and agrees that this Agreement
supersedes the Prior Agreement, which shall no longer be in force or have any effect.

(b) No provision of this Agreement may be amended, altered, modified, waived or discharged
unless such amendment, alteration, modification, waiver or discharge is agreed to in writing and
signed by the Executive and such officer of the Company as shall be specifically designated by the
Board.

(c) No waiver by either party, at any time, of any breach by the other party of, or of
compliance by the other party with, any condition or provision of this Agreement to be performed or
complied with by such other party shall be deemed a waiver of any similar or dissimilar provision
or condition of this Agreement or any other breach of or failure to comply with the same condition
or provision at the same time or at any prior or subsequent time.

17. Severability. If any one or more of the provisions of this Agreement shall be
held to be invalid, illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be affected thereby. To the extent permitted by
applicable law, each party hereto waives such provision of law which renders any provision of this
Agreement invalid, illegal or unenforceable.

18. Governing Law; Venue. The validity, interpretation, construction and performance
of this Agreement shall be governed on a non-exclusive basis by the laws of the State of
Connecticut without giving effect to its conflict of laws rules. For purposes of jurisdiction and
venue, the Company and each Employer hereby consents to jurisdiction and venue in any suit, action
or proceeding with respect to this Agreement in any court of competent jurisdiction in the sate in
which the Executive resides at the commencement of such suit, action or proceeding and waives any
objection, challenge or dispute as to such jurisdiction or venue being proper.

19. Section 409A Compliance. To the extent applicable, this Agreement shall be
interpreted in accordance with, and incorporate the terms and conditions required by, Section 409A.
Notwithstanding any provision of this Agreement to the contrary, in the event that the Company
determines that any compensation or benefits payable under this Agreement will be immediately
taxable to the Executive under Section 409A, the Company reserves the right (without any obligation
to do so or to indemnify the Executive for failure to do so) to (a) adopt such amendments to this
Agreement and appropriate policies and procedures, including amendments, policies and procedures
with retroactive effect, that the Company determines to be necessary or appropriate to preserve the
intended tax treatment of the benefits provided by this Agreement, to preserve the economic
benefits of this Agreement and to avoid less favorable accounting or tax consequences for the
Company and/or (b) take such other actions as the Company determines to be necessary or appropriate
to exempt the amounts payable hereunder from Section 409A or to comply with the requirements of
Section 409A and thereby avoid the application of penalty taxes thereunder. No provision of this
Agreement shall be interpreted or construed to transfer any liability for failure to comply with
Section 409A from the Executive or any other individual to the Company or any of its affiliates,
employees or agents.

20. Counterparts. This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original and all of which together shall be deemed to constitute one and
the same instrument.

IN WITNESS WHEREOF, the parties hereto have executed this Change in Control Severance
Agreement as of the date first above written.

HUBBELL INCORPORATED

By: /s/ Stephen M. Mais

Vice President, Human Resources

EXECUTIVE

/s/ William T. Tolley

EXHIBIT A

WAIVER AND RELEASE OF CLAIMS AGREEMENT

[      ] (the “Releasor”) on behalf of himself and his spouse and child or
children (if any), and his heirs, beneficiaries, devisees, executors, administrators, attorneys,
personal representatives, successors and assigns, hereby forever releases and discharges Hubbell
Incorporated, a Connecticut corporation (the “Company”), and any of its past, present, or
future parent, affiliated, related, and/or subsidiary entities, and all of the past and present
directors, shareholders, officers, general or limited partners, members, employees, agents,
attorneys, advisors, representatives, successors and assigns of such entities, and employee benefit
plans in which the Releasor is or has been a participant by virtue of his employment with the
Company (collectively, the “Releasees”), from, and covenants not to sue any of the
Releasees with respect to, any and all claims, debts, demands, accounts, judgments, rights, causes
of action, equitable relief, damages, costs, charges, complaints, obligations, promises,
agreements, controversies, suits, expenses, compensation, responsibility and liability of every
kind and character whatsoever (including attorneys’ fees and costs), whether in law or equity,
known or unknown, asserted or unasserted, suspected or unsuspected (collectively,
“Claims”), which the Releasor has or may have had against such Releasees or any of them
arising out of, resulting from, relating to, based upon or otherwise in connection with, in whole
or in part, any events or circumstances arising or occurring on or prior to the date this Waiver
and Release of Claims Agreement (the “Release”) is executed, including, without limitation,
any and all Claims directly or indirectly arising out of, relating to or in any other way involving
in any manner whatsoever (a) the Releasor’s employment with the Company or its subsidiaries or the
termination thereof, (b) the Releasor’s status at any time as a holder of any securities of the
Company and (c) any and all Claims arising under federal, state, or local laws relating to
employment, or securities, including without limitation claims of wrongful discharge, breach of
express or implied contract, fraud, misrepresentation, defamation, or liability in tort, claims of
any kind that may be brought in any court or administrative agency, any claims arising under Title
VII of the Civil Rights Act of 1964, the Age Discrimination in Employment Act, the Americans with
Disabilities Act, the Fair Labor Standards Act, the Employee Retirement Income Security Act, the
Family and Medical Leave Act, the Securities Act of 1933, the Securities Exchange Act of 1934, the
Sarbanes-Oxley Act, and similar state or local statutes, ordinances, and regulations;
provided, however, notwithstanding anything to the contrary set forth herein, that
this general release shall not extend to benefit claims under employee benefit plans in which the
Releasor is a participant by virtue of his employment with the Company or its subsidiaries.

The Releasor understands that this Release includes a release of claims arising under the Age
Discrimination in Employment Act (ADEA). The Releasor understands and warrants that he has been
given a period of 21 days to review and consider this release. The Releasor further warrants that
he understands that he may use as much or all of his 21-day period as he wishes before signing, and
warrants that he has done so. The Releasor further warrants that he understands that, with respect
to the release of age discrimination claims only, he has a period of seven days after executing on
the second signature line below to revoke the release of age discrimination claims by notice in
writing to the Company.

The Releasor is hereby advised to consult with an attorney prior to executing this Release.
By his signature below, the Releasor warrants that he has had the opportunity to do so and to be
fully and fairly advised by that legal counsel as to the terms of this Release.

ACKNOWLEDGEMENT (AS TO ALL CLAIMS

OTHER THAN AGE DISCRIMINATION CLAIMS)

The undersigned, having had full opportunity to review this Release with counsel of his
choosing, signifies his agreement to the terms of this Release (other than as it relates to age
discrimination claims) by his signature below.

[Releasor] Date

ACKNOWLEDGEMENT (AGE DISCRIMINATION CLAIMS)

The undersigned, having had full opportunity to review this release with counsel of his
choosing, signifies his agreement to the terms of this release (as it relates to age discrimination
claims) by his signature below.

[Releasor] DateEX-10.1

SECOND SUPPLEMENTAL INDENTURE

SECOND SUPPLEMENTAL INDENTURE, dated as of December 30, 2010 (this “Second Supplemental
Indenture”), among Allied World Assurance Company Holdings, Ltd, a Bermuda company (the
“Company”), Allied World Assurance Company Holdings, AG, a Swiss company and the parent of
the Company (the “Guarantor”), and The Bank of New York Mellon (f/k/a The Bank of New
York), a New York banking corporation, as trustee (the “Trustee”). Capitalized terms used
but not defined in this Second Supplemental Indenture have the meanings ascribed to such terms in
the Indenture (as defined below).

WHEREAS, the Company has executed and delivered to the Trustee an indenture (the “Original
Indenture”), dated as of July 26, 2006, between the Company and the Trustee, as supplemented by
the First Supplemental Indenture (the “First Supplemental Indenture” and together with the
Original Indenture, the “Indenture”), dated as of July 26, 2006, providing for the issuance
by the Company of its 7.50% Senior Notes due 2016 (the “Notes”);

WHEREAS, on December 1, 2010, the Company and the Guarantor consummated the Scheme of
Arrangement (the “Scheme of Arrangement”) pursuant to which the Company became a wholly
owned subsidiary of the Guarantor;

WHEREAS, in connection with the Scheme of Arrangement, the Guarantor desires to provide a full
and unconditional guarantee (the “Guarantee”) of the obligations of the Company under the
Notes;

WHEREAS, Section 901(4) of the Indenture provides, in part, that the Company, when authorized
by a Board Resolution, and the Trustee may, without the consent of any Holders, enter into a
supplemental indenture to provide guarantees of the Securities;

WHEREAS, the Company has furnished the Trustee a duly authorized and executed Company Order,
dated December 30, 2010, authorizing the execution of this Second Supplemental Indenture; and

WHEREAS, all things necessary to make this Second Supplemental Indenture a valid agreement of
the Company, the Guarantor and the Trustee and a valid supplement to the Indenture have been done;

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant
and agree for the equal and ratable benefit of the Holders of the Notes, as follows:

ARTICLE I

GUARANTEE

SECTION 1.1. Guarantee. The Guarantor hereby unconditionally and irrevocably
guarantees to each Holder and to the Trustee and its successors and assigns (a) the full and
punctual payment of principal of and interest on the Notes when due, whether at maturity, by
acceleration, by redemption or otherwise, and all other monetary obligations of the Company under
the Indenture and the Notes and (b) the full and punctual performance within applicable grace
periods of all other obligations of the Company under the Indenture and the Notes (all the
foregoing being hereinafter collectively called the “Guaranteed Obligations”). The
Guarantor further agrees that the Guaranteed Obligations may be extended or renewed, in whole or in
part, without notice or further assent from the Guarantor and that the Guarantor will remain bound
under its Guarantee herein notwithstanding any extension or renewal of any obligations under the
Notes.

The Guarantor waives presentation to, demand of, payment from and protest to the Company of
any of the Guaranteed Obligations and also waives notice of protest for nonpayment. The Guarantor
waives notice of any default under the Notes or the Guaranteed Obligations. The obligations of the
Guarantor hereunder shall not be affected by (1) the failure of any Holder or the Trustee to assert
any claim or demand or to enforce any right or remedy against the Company or any other Person under
the Indenture, the Notes or any other agreement or otherwise; (2) any extension or renewal of any
thereof; (3) any rescission, waiver, amendment or modification of any of the terms or provisions of
the Indenture, the Notes or any other agreement; (4) the release of any security held by any Holder
or the Trustee for the Guaranteed Obligations or any of them; (5) the failure of any Holder or the
Trustee to exercise any right or remedy against any other guarantor of the Guaranteed Obligations;
or (6) any change in the ownership of the Guarantor.

The Guarantor further agrees that its Guarantee herein constitutes a guarantee of payment,
performance and compliance when due (and not a guarantee of collection) and waives any right to
require that any resort be had by any Holder or the Trustee to any security held for payment of the
Guaranteed Obligations.

Except as expressly set forth in Section 1.2 below, the obligations of the Guarantor hereunder
shall not be subject to any reduction, limitation, impairment or termination for any reason,
including any claim of waiver, release, surrender, alteration or compromise, and shall not be
subject to any defense of setoff, counterclaim, recoupment or termination whatsoever or by reason
of the invalidity, illegality or unenforceability of the Guaranteed Obligations or otherwise.
Without limiting the generality of the foregoing, the obligations of the Guarantor herein shall not
be discharged or impaired or otherwise affected by the failure of any Holder or the Trustee to
assert any claim or demand or to enforce any remedy under the Indenture, the Notes or any other
agreement, by any waiver or modification of any thereof, by any default, failure or delay, willful
or otherwise, in the performance of the obligations, or by any other act or thing or omission or
delay to do any other act or thing which may or might in any manner or to any extent vary the risk
of the Guarantor or would otherwise operate as a discharge of the Guarantor as a matter of law or
equity.

The Guarantor further agrees that its Guarantee herein shall continue to be effective or be
reinstated, as the case may be, if at any time payment, or any part thereof, of principal of or
interest on any Note is rescinded or must otherwise be restored by any Holder or the Trustee upon
the bankruptcy or reorganization of the Company or otherwise.

In furtherance of the foregoing and not in limitation of any other right which any Holder or
the Trustee has at law or in equity against the Guarantor by virtue hereof, upon the failure of the
Company to pay the principal of or interest on any Note when and as the same shall become due,
whether at maturity, by acceleration, by redemption or otherwise, or to perform or comply with any
other obligation under the Notes, the Guarantor hereby promises to and shall, upon receipt of
written demand by the Trustee, forthwith pay, or cause to be paid, in cash, to the Holders or the
Trustee an amount equal to the sum of (A) the unpaid amount of such Guaranteed Obligations,
(B) accrued and unpaid interest on such Guaranteed Obligations (but only to the extent not
prohibited by law) and (C) all other monetary Guaranteed Obligations of the Company to the Holders
and the Trustee.

The Guarantor agrees that it shall not be entitled to any right of subrogation in respect of
any obligations under the Notes guaranteed hereby until payment in full of all obligations under
the Notes. The Guarantor agrees that, as between it, on the one hand, and the Holders and the
Trustee, on the other hand, (i) the maturity of the Guaranteed Obligations may be accelerated as
provided in the Indenture for the purposes of the Guarantor’s Guarantee herein, notwithstanding any
stay, injunction or other prohibition preventing such acceleration in respect of the Guaranteed
Obligations guaranteed hereby, and (ii) in the event of any declaration of acceleration of such
Guaranteed Obligations as provided herein, such Guaranteed Obligations (whether or not due and
payable) shall forthwith become due and payable by the Guarantor for the purposes of this Article
1.

The Guarantor also agrees to pay any and all costs and expenses (including reasonable
attorneys’ fees) incurred by the Trustee or any Holder in enforcing any rights under this Article
1.

SECTION 1.2. Limitation on Liability. Any term or provision of this Second
Supplemental Indenture to the contrary notwithstanding, the maximum aggregate amount of the
Guaranteed Obligations guaranteed hereunder by the Guarantor shall not exceed the maximum amount
that can be hereby guaranteed without rendering this Second Supplemental Indenture, as it relates
to the Guarantor, voidable under applicable law relating to fraudulent conveyance or fraudulent
transfer or similar laws affecting the rights of creditors generally.

SECTION 1.3. Successors and Assigns. This Article 1 shall be binding upon the
Guarantor and its successors and assigns and shall inure to the benefit of the successors and
assigns of the Trustee and the Holders and, in the event of any transfer or assignment of rights by
any Holder or the Trustee, the rights and privileges conferred upon that party in the Indenture and
in the Notes shall automatically extend to and be vested in such transferee or assignee, all
subject to the terms and conditions of the Indenture.

SECTION 1.4. No Waiver. Neither a failure nor a delay on the part of either the
Trustee or the Holders in exercising any right, power or privilege under this Article 1 shall
operate as a waiver thereof, nor shall a single or partial exercise thereof preclude any other or
further exercise of any right, power or privilege. The rights, remedies and benefits of the
Trustee and the Holders herein expressly specified are cumulative and not exclusive of any other
rights, remedies or benefits which either may have under this Article 1 at law, in equity, by
statute or otherwise.

SECTION 1.5. Modification. No modification, amendment or waiver of any provision of
this Article 1, nor the consent to any departure by the Guarantor therefrom, shall in any event be
effective unless the same shall be in writing and signed by the Trustee, and then such waiver or
consent shall be effective only in the specific instance and for the purpose for which given. No
notice to or demand on the Guarantor in any case shall entitle the Guarantor to any other or
further notice or demand in the same, similar or other circumstances.

SECTION 1.6. Notation of Guarantee Not Required. The Guarantor hereby agrees that the
Guarantee set forth in this Article 1 shall remain in full force and effect notwithstanding the
absence on any Note of a notation relating to the Guarantee.

SECTION 1.7. Release of the Guarantor. The Guarantee shall be automatically and
unconditionally released and discharged, and no action by the Guarantor, the Company or the Trustee
shall be required for the release of the Guarantee:

(i) upon defeasance and discharge of the Notes pursuant to Articles 403 and 404 of the
Indenture;

(ii) upon the full satisfaction of the Company’s obligations under the Indenture; or

(iii) upon the Company delivering to the Trustee an Officers’ Certificate stating that the
Guarantee is released in full, provided that no Default or Event of Default has occurred and is
continuing.

ARTICLE II

MISCELLANEOUS

SECTION 2.1. Effect of the Second Supplemental Indenture. Except as expressly
amended hereby, the Indenture is in all respects ratified and confirmed and all the terms,
conditions and provisions thereof shall remain in full force and effect. This Second Supplemental
Indenture shall form a part of the Indenture for all purposes, and every Holder heretofore or
hereafter authenticated and delivered shall be bound hereby. All provisions of this Second
Supplemental Indenture shall be deemed to be incorporated in, and a part of, the Indenture; and the
Indenture and this Second Supplemental Indenture, shall be read, taken and construed as one and the
same instrument.

SECTION 2.2. Effect of Headings. The Article and Section headings herein are inserted
for convenience only and shall not be deemed part thereof.

SECTION 2.3. Severability Clause. In case any provision in this Second Supplemental
Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

SECTION 2.4. Conflict. In the event that there is a conflict or inconsistency
between the Indenture and this Second Supplemental Indenture, the provisions of this Second
Supplemental Indenture shall control; provided, however, if any provision set forth in this Second
Supplemental Indenture limits, qualifies or conflicts with another provision herein which is
required or deemed to be included in the Indenture by any of the provisions of the Trust Indenture
Act, such required or deemed provision shall control.

SECTION 2.5. Governing Law. THIS SECOND SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

SECTION 2.6. Submission to Jurisdiction. By execution and delivery of this Second
Supplemental Indenture, the Company and the Guarantor submit to the jurisdiction of any Federal or
state court sitting in The City of New York or its Borough of Manhattan over any suit, action or
proceeding arising out of or relating to this Second Supplemental Indenture and the Guarantee
contained herein.

SECTION 2.7. Trustee. The Trustee shall not be responsible in any manner whatsoever
for or in respect of the validity or sufficiency of this Second Supplemental Indenture or for or in
respect of the recitals contained herein, all of which are made solely by the Company and the
Guarantor.

SECTION 2.8. Counterparts. This Second Supplemental Indenture may be executed in
any number of counterparts, each of which so executed shall be deemed to be an original, but all
such counterparts shall together constitute but one and the same instrument.

1

IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be
duly executed as of the day and year first written above.

ALLIED WORLD ASSURANCE COMPANY

HOLDINGS, LTD

By:    /s/ Scott A. Carmilani

Name: Scott A. Carmilani

Title: President & Chief Executive Officer

ALLIED WORLD ASSURANCE COMPANY

HOLDINGS, AG

as GUARANTOR

By:    /s/ Scott A. Carmilani

Name: Scott A. Carmilani

Title: President & Chief Executive Officer

THE BANK OF NEW YORK MELLON,

as TRUSTEE

By:    /s/ Latoya S. Elvin

Name: Latoya S. Elvin

Title: Associate

2

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