EA740 Series

Inside Containment Areas

Nuclear Qualified Products

Limit Switches/Receptacle
Assembly...
For Nuclear
Environments

Features:

Technical Data:• Qualified to IEEE Standards 344-1975, 323-1974, and382-1972.
• Manufactured to a quality assurance program designed
to meet the requirements of 10CFR50, Appendix B, andANSI N45.2, as applicable.
• Die-cast bronze housing.
• Stainless steel top cover and fasteners.
• Gold-plated contacts.
• High temperature components throughout.
• High temperature lubricants.
• Pressure and radiation resistant• Seismic and vibration resistant.
• Resists chemical spray.
• Three mounting styles.
• EA 740 has a cam action latching mechanism.

• Two normally open and two normally closed, NEMAform Z contact arrangement.
• Enclosure meets NEMA 1, 4 and 13 requirements fordust-tight, water-tight and oil-tight applications.
• Operating lever is adjustable in 7°30' increments
through 360°.
• Adequate wiring space for nine conductors.
• Rated at 21°C to 90°C.
• Short term exposure to 175°C.
• EA 740 has 18° pre-travel, maximum travel 90°.
• Weight EA 740: 4.3 lbs.; EA 740 with Receptacle: 5.3lbs.
• DBE maximum test parameters — temperature 340°F,
pressure 70 PSIG, radiation 204 megarads gamma.

Receptacle Data

Continuous Current Rating
75-100% Power Factor*
125 VAC
250 VAC480 VAC
600 VAC
125 VDC
250 VDC

20 AMPS*
15 AMPS*
10 AMPS*
5 AMPS*
5 AMPS
1.5 AMPS• Qualified receptacle sealed in place.
• Qualified ring tongue terminal applied to leads.
• Every assembly tested before shipment.
• Qualified lead wires.
• Receptacle keyed for proper alignment of connector.
• All circuits wired.
• Circuits of receptacle identified the same as limit switch
A, B, C, D, etc.

EA740 Series

Nuclear Qualified Products

FOR INSIDE CONTAINMENT AREAS SWITCHES SHOULD BE SPECIFIED AS FOLLOWS:

EA740 Series
SeriesOperation
CWStandard

WideLong

Series

EA74020000

50000

80000

20001

50001

80001

20100

50100

80100

Maint.
"M"
Cam

26000

56000

86000

Maint.
"M7"
Cam

26700

EA740
CCW
Standard CW & CCW(B2 cam)

EA740
Maint.

EA740 Series with Receptacle
Standard

50040

80040

20041

50041

80041

20140

50140

80140

Maint.
"M"
Cam

26040

56040

86040

Maint.
"M7"
Cam

26740

56740

86740

Male Receptacle Assemblies may be ordered separately.
Please order part number EC290-19001.

Dimensions

0.92"(23.4)

3.19"(81.0)Long Mounting
0.50"(12.7)
0.68"(17.3)

0.260/0.255 Dia.
Four Holes Each

0.66"
(16.8)
0.28"
(7.1)

2.63"
(66.8)

0.41"(10.4)

0.53"(13.5)

0.44"(11.2)

1/420 Thd.
0.38 Deep
Four Holes

4.38"(111.3)

WideMounting

6.41"(162.8)4.94"(125.5)

7.06"(179.3)0.125"
(3.2)

4.57"
Ref.

1.59"
(40.4)
2.60" Max.
(66.0)

2.81"(71.4)

3.25"(82.6)

1.81"(46.0)
2.25"(57.2)

Long

20040

EA740
CCW
Standard CW & CCW(B2 cam)

86700

Wide
EA740-CW

EA740
Maint.

56700

Operation

0.22"
(5.6)

0.22"
(5.6)

7.06"
(179.3)

EA740 Series

Nuclear Qualified Products

Operational Data

Standard Contacts
For CW Switch
CA
B

DC
A

Initial

CW

DB

CCW

For CCW Switch
InitialCWCCWFor CW & CCW Switch
Initial

CW

CCW

H

GH

GHGFE

FE

F

E

DC

DC

DCBA

B

A

B

A

A. Trip Travel ................................................... 18°
B. Reset Travel ............................................... 14°
C. Recommended Travel ................................ 30°
D. Total Travel Available ................................. 90°
Torque to Trip (inch Lbs.) ........................... 27
2 N.O. — 2 N.C.

Maintained Contacts & Lever Position
InitialPosition
DC

InitialPositionF

A

For CW Switch

F

Initial

CW

C DA

B

B
E

E

CCW Operating

CCW

For CCW Switch
InitialCW

CCW

HGHGFEF

E

DC

DCBA

B

A

CW Operating

CCW CW
A. Trip Travel ................................................... 25°
55°
B. Reset Travel ............................................... 25°
22°
C. Min. Travel to Maintain .............................. 54°
55°
D. Recommended Travel ................................ 60°
60°
E. Total Travel ................................................. 124° 116°
F. Overall Travel ............................................. 56°
64°
G. Torque to Trip (inch Lbs.) ........................... 126To change switch orientation from cam (left view) position
to cam (right view) position, operate switch thru angle C.
Remove lever and reset at initial position.

Maintained Contacts — Lever Returned
InitialPosition
DCA

InitialPositionBBEE

CCW Operating

For CW SwitchCDAECW Operating

CCW
A. Trip Travel ................................................... 16°
B. Reset Travel ............................................... 30°
C. Min. Travel to Maintain .............................. 26°
D. Recommended Travel ................................ 45°
E. Total Travel ................................................. 90°
F. Torque to Trip (inch Lbs.) ........................... 16.5

CW
30°
26°
30°
45°
90°
15To change switch orientation from cam (left view) position
to cam (right view) position, operate switch thru angle B.
Remove lever and reset at initial position.

InitialCWE

CCW

For CCW Switch
InitialCW

CCWHGHGFEFEDCDCBABA

EA740 Series

Nuclear Qualified ProductsAccessories

PLUG-IN CABLES: Cable lengths
for the above Switch/ Receptacle
Assemblies should be ordered withspecific cable lengths as follows . . .
Plug-In Cables
LengthEC29020 Ft.
29020
25 Ft.
29025
30 Ft.
29030
35 Ft.
29035
50 Ft.
29050
100 Ft.
29100
LEVERS: For use inside containment area, levers with bronze arms
and beryllium copper rollers arerecommended.
Note: Levers must be ordered as
separate item. For information request Lever Bulletin EL.

ADAPTORS: Straight and elbow
adapters are available for direct
mounting into limit switches. See CD/EH700 Series Bulletin.

2013 West Meeting Street • Lancaster, SC 29720 • Technical Assistance: 1-800-NAMTECH© 2002 Namco Controls • www.namcocontrols.com • EADS04-G | 12/2002