Reed Switches Datasheet

Axial Lead Reed Switches

MRPR-2020.3mm Miniature High Voltage and High Power Reed SwitchRoHSDescription
The MRPR-20 Reed Switch is a miniature, normally open switch with a 20.32mm
long x 2.84mm diameter (0.800” x 0.112”) glass envelope, capable of highvoltage and power switching of 265Vac at 50VA. The MRPR-20 has highinsulation resistance of 1010 ohms minimum and contact resistance less than
100 milli-ohms.

Features & Benefits■ Miniature normally openswitch■ Approved to EN 60079-0 andEN 60079-15.

■ Capable of switching 265Vac
or 1.5A at up to 50W/VA■ Hermetically sealed switch
contacts are not affected byand have no effect on theirexternal environment■ Minimum breakdown voltage
750Vdc■ Available sensitivity range
17-43 AT■ UL Recognized to UL 121201,
UL 60079-0, UL 60079-15,
C22.2 No. 213-17, C22.2
No. 60079-0 and C22.2 No.
60079-15.

Agency Approvals
AgencyAgency File Number

Ampere-Turns Range

E47258, E471070

17-43 AT

■ Zero operating power
requiredfor contact■ High voltage and powerswitching with a miniatureswitch

Note: Contact Littelfuse for specific agency approval ratings.

Applications
Dimensions■ Reed relays (suitable forswitching global mainsvoltage)

Dimensions in mm (inch)
0.63(.025) DIA. REF.

CL OF OVERLAP■ Telecom line switching■ Heavy Load Switching■ Limit switching

28.32(1.115) REF.
2.84(.112) MAX.

Switch TypeContact Form

18.16(.715) MIN.

20.32(.800) MAX.

Materials

56.64(2.230) NOM.

A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire

Note: SPST-NO = Single-pole, single-throw, normally openElectrical Ratings
Contact Rating
Voltage 3
Current 3
Resistance
Capacitance
Temperature

W/VA - max.
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C°C

1

Switching 2
Breakdown 4
Switching 2
Carry
Contact, Initial
Insulation
Contact
OperatingStorage 5

50250
265
750
1.5
1.1
3.0
0.100
1010
0.2
-20 to +125
-65 to +125

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.

1© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 09/22/21

Axial Lead Reed Switches

Reed Switches Datasheet

MRPR-2020.3mm Miniature High Voltage and High Power Reed Switch

Product Characteristics
Operating Characteristics

Operate Time 1
Release Time0.75ms - max.
0.3ms - max.

1Shock 2

11ms 1∕2 sine wave

Vibration 2

50-2000 Hertz

100G - max.
30G - max.

Resonant Frequency

2.1kHz - typ.
Magnetic Characteristics

Ampere Turns

17-43

Rating Sensitivity 4

Pull-In Range

Ampere Turns

22

Test Coil-L4989

3

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 Chart

Part Numbering System

40

MRPR-20 - 17-28

35

Drop-Out (AT, L4989 Coil)

3025Series

Max.
20AT Range
17-43 AT
17-23 AT
17-28 AT
22-33 AT
27-33 AT
27-38 AT
32-38 AT
32-43 AT
37-43 AT

15Min.
1050051015202530

3540

4550

Pull-In (AT, L4989 Coil)

Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.

Example:17-28 AT product is
MRPR-20-17-28

Note: These AT values are the before-modification values of the bare reed switch.

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity & Packaging Code

Taping WidthBulk

Bulk

1000

N/A

N/A

Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are
not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.

2© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 09/22/21