MRPR-3 Series - 19.7mm High Power Reed Switch

Series: MRPR-3
Obsolete: 2016 -04-27 Replaced By: MRPR-20 series
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

A miniature, normally open switch with a 19.69mm long x 2.84mm diameter (0.770" x .112") glass envelope. Capable of switching up to 200Vdc at 50W. It is rated to carry 3A and switch 1.5A. Available sensitivity range of 22-43 AT. High insulation resistance of 1010 ohms minimum and contact resistance of less than 100 milliohms. Ideally suited for limit sensing, telecom and office equipment. Will handle light inductive loads with no suppression circuitry.


  • Normally open switch capable of switching 200Vdc or 1.5A at up to 50 Watts
  • Available sensitivity range of 22-43 AT


  • Hermetically sealed switch contacts are not affected by and have no effect on their external environment
  • Zero operating power required for contact closure


  • Limit switching
  • Telecom
  • Office equipment
  • Light inductive loads

Access specifications, certifications, check availability and order parts below

Catalog #Switching Power (W)Switching Voltage (V DC)Switching Current (A DC)Breakdown Voltage (V DC)Max Contact Resistance (Ω)Magnetic Sensitivity (AT)Body Length (mm)Overall Length (mm)Switch TypeOperating TemperatureCompare
Obsolete: 2018 -01-04
Replaced By: MRPR-20-22-28
502001.53000.122 to 2819.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2018 -01-04
Replaced By: MRPR-20-22-33
502001.53000.122 to 3319.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2018 -01-04
Replaced By: MRPR-20-27-33
502001.53000.127 to 3319.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2016 -08-31
Replaced By: MRPR-20-27-38
502001.53000.127 to 3819.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2018 -01-04
Replaced By: MRPR-20-32-38
502001.53000.132 to 3819.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2018 -01-04
Replaced By: MRPR-20-32-43
502001.53000.132 to 4319.6956.64A:SPST-NO-40° to 125°C
Obsolete: 2018 -01-04
Replaced By: MRPR-20-37-43
502001.53000.137 to 4319.6956.64A:SPST-NO-40° to 125°C

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pdficon Extreme Temperature Reed Switch Operation Application Note

Littelfuse reed switches are normally specified to operate in a temperature range of -40 ?C to +125 ?C. T

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pdficon Inductive Load Arc Suppression Application Note

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pdficon Ampere turn versus mT and Gauss Application Note

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pdficon Vibration Testing and Precautions Application Note

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The data sheets for Littelfuse parts show temperature ranges for storage. However long term exposure to extreme temperatures in the specified storage temperature range may degrade solderability of terminals.

pdficon Handling of Reed Sensors Relays And Switches Application Note

When used within their capabilities Littelfuse reed sensors reed relays and reed switches provide many years of robust performance

pdficon Measuring Reed Switch Sensitivity and Contact Resistance Application Note

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Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
MRPR-3-22-28 MRPR-3 5273 22-28 RoHS No 04/21/2016 PbFree No 04/21/2016 Yes
MRPR-3-32-38 MRPR-3 5273 32-38 RoHS No 04/21/2016 PbFree No 04/21/2016 Yes
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