Axial Lead Reed SwitchesHigh Power > MLRR-4

MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch
RoHS

Description
The MLRR-4 Reed Switch is a sub-miniature, normally open switch with a15.24mm long x 2.54mm diameter (0.600” x 0.100”) glass envelope, and capableof switching 200Vdc at 20W with close differential (CD) characteristics. It has
high insulation resistance of 1010 ohms minimum and contact resistance lessthan 100 milli-ohms. It can handle lamp loads up to 2W @ 14V with no suppression
circuitry. This reed switch is also available in a surface mount version,that is, MLSM-4.

Features• Sub-miniature normally open switch• Capable of switching 200Vdc or
1.0A at up to 20W• Close differential AT between PI
and DO value

Agency Approvals
AgencyAgency File Number

Ampere-Turns Range

E47258E471070

17-38 AT

Note: Contact Littelfuse for specific agency approval ratings.

Dimensions• Available sensitivity range 17-38 AT• Capable of switching small
incandescent lamp loads

Benefits• Hermetically sealed switch contacts
are not affected by and have noeffect on their external environment• Zero operating power required forcontact closure• Excellent for switching
microcontroller logic level loads andsmall incandesent lamp loads

Applications

Dimensions in mm
20.19(.795) REF.
CL OF OVERLAP

Ø2.66(.105) MAX.

0.61
(0.024) DIA. REF.

• Position Sensing• Security Systems• Level Sensing• Light Inductive Loads• Office Equipments• Lamp Loads up to 2W @ 14V

Switch Type12.19(.480) MIN.

15.24(.600) MAX.
40.38(1.590) NOM.

Contact Form

A (SPST-NO)

Materials

Body: Glass
Leads: Tin Plated Nickel Iron

Note: SPST-NO = Single-pole, single-throw, normally open

Electrical Ratings
Contact Rating 1

Watt - max.

20

Vdc - max.
Vac - max.
Vdc - min.

200
140250Carry

Adc - max.
Aac - max.
Adc - max.

1.0
0.7
1.0

ResistanceContact, Initial
Insulation

Ω - max.
Ω - min.

0.10
1010

CapacitanceContact

pF - typ.

0.4

Temperature

OperatingStorage 5°C°C-40 to +125
-65 to +125

Switching2

Voltage 3
Breakdown 4
Switching 2
Current 3

Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information.
2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.

© 2020 Littelfuse
Revised: BO.12/08/20
Specifications are subject to change without notice.

littelfuse.com

Axial Lead Reed SwitchesHigh Power > MLRR-4

MLRR-4 15.2mm Sub-miniature Close Differential Reed Switch

Product Characteristics
Operating Characteristics
Operate Time 1

0.6ms - max.

Release Time

0.2ms - max.

Shock

1

2

Vibration 2

11ms 1∕2 sine wave

100G - max.

50-2000 Hertz

30G - max.

Resonant Frequency

6.25kHz - typ.

Magnetic Characteristics
Pull-In Range 3
Rating Sensitivity

Ampere Turns

17-38

Ampere Turns

420

Test Coil

L4989

Notes:
1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil II).
2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse.

Drop-Out vs. Pull-In ChartPart Numbering System

MLRR-4-17-2340Max.
35

Drop-Out (AT, L4989 Coil)

30Min.

Series252015105005101520253035404550

AT Range
17-23 AT
17-28 AT
22-28 AT
22-33 AT
27-33 AT
27-38 AT
32-38 AT

Example:17-23 AT product is
MLRR-4-17-23

Pull-In (AT, L4989 Coil)

Note: The chart represents the range of Drop-Out, minimum to maximum for a given Pull-In value.

Note: This AT value is the before-modification value of the bare reed switch.

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity & Packaging CodeTaping WidthBulk

Bulk

3000

N/A

N/A© 2020 Littelfuse
Revised: BO.12/08/20
Specifications are subject to change without notice.

littelfuse.com