MRPR-20 Series - 20.32mm High Voltage and High Power Reed Switch

Reed Switches MRPR 20 Hi Res
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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.

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 high voltage and power switching of 265Vac at 50VA. The MRPR-20 has high insulation resistance of 1010 ohms minimum and contact resistance less than 100 milli-ohms.


  • Miniature normally open switch
  • Capable of switching 265Vac or 1.5A at up to 50W/VA 
  • Minimum breakdown voltage 750Vdc
  • Available sensitivity range 17-43 AT


  • Reed relays (suitable for switching global mains voltage)
  • Limit switching
  • Telecom line switching
  • Heavy Load Switching

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 TemperaturePartner ECAD ModelsStockSamplesCompare
MRPR-20-17-23502501.57500.117 to 2320.3256.64A:SPST-NO-20° to 125°CMRPR-20-17-23CheckOrder
MRPR-20-17-28502501.57500.122 to 4320.3256.64A:SPST-NO-20° to 125°CMRPR-20-17-28CheckOrder
MRPR-20-17-43502501.57500.117 to 4320.3256.64A:SPST-NO-20° to 125°CMRPR-20-17-43CheckOrder
MRPR-20-22-28502501.57500.122 to 2820.3256.64A:SPST-NO-20° to 125°CMRPR-20-22-28CheckOrder
MRPR-20-22-33502501.57500.122 to 3320.3256.64A:SPST-NO-20° to 125°CMRPR-20-22-33CheckOrder
MRPR-20-22-43502501.57500.122 to 4320.3256.64A:SPST-NO-20° to 125°CMRPR-20-22-43CheckOrder
MRPR-20-27-33502501.57500.127 to 3320.3256.64A:SPST-NO-20° to 125°CMRPR-20-27-33CheckOrder
MRPR-20-27-38502501.57500.127 to 3820.3256.64A:SPST-NO-20° to 125°CMRPR-20-27-38CheckOrder
MRPR-20-32-38502501.57500.132 to 3820.3256.64A:SPST-NO-20° to 125°CMRPR-20-32-38CheckOrder
MRPR-20-32-43502501.57500.132 to 4320.3256.64A:SPST-NO-20° to 125°CMRPR-20-32-43CheckOrder
MRPR-20-37-43502501.57500.137 to 4320.3256.64A:SPST-NO-20° to 125°CMRPR-20-37-43CheckOrder

pdficon Reed Switch Selection Guide

A quick reference guide to selecting reed switches for electronic applications

pdficon Position and Level Sensing in Washing Machines

A most integral appliance in any home is a washing machine. Washing machines have helped made the chore of cleaning clothes quite effortless.

pdficon Soldering Temperatures Application Note

This application note applies to all of Littelfuse?s products that are normally soldered to printed circuit boards (PCBs) including all reed switches.

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

pdficon Reed Switch and Reed Sensor Activation Application Note

Although a reed switch can be activated by placing it inside an electrical coil many reed switches and reed sensors are used for proximity sensing and are activated by a magnet.

pdficon Inductive Load Arc Suppression Application Note

When a reed switch or reed sensor is used to control an inductive device (relay coil solenoid transformer small motor etc.)

pdficon Catalog Glossary Reed Switch Terms Application Note

Reed Switch Terms Glossary

pdficon Ampere turn versus mT and Gauss Application Note

What is the relationship between AT (Ampere*turn) and Tesla or Gauss? What magnet strength will activate a 15 AT reed switch at 5 mm?

pdficon Vibration Testing and Precautions Application Note

Littelfuse tests sinusoidal vibration according to Mil. Std. 202G Method 204D Test Condition G (10 ? 2000 Hz frequency sweep at 30 G or 0.06 inch double amplitude whichever is less).

pdficon Capacitive Loads Application Note

When there is significant capacitance in a reed sensor reed relay or reed switch circuit the peak current and energy switched by the reed contacts should be considered.

pdficon Reed Switch Extended Shock Capabilities Application Note

The maximum shock specifications in the Littelfuse catalog are very conservative for most switches smaller than the DRxxxx type. T

pdficon Rice Cooker Lid Lock Application Note

The position sensing lid lock ensures that the lid is securely locked in place.

pdficon Storage of Littelfuse Sensor Parts Application Note

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

The purpose of this application note is to document the preferred method of reading the sensitivity and contact resistance of Littelfuse reed switches.

pdficon Flow Sensing in Tankless Water Heaters Application Note

Reed switches and sensors are highly effective solutions for flow sensing applications that can be used for detecting the presence of fluid flow in a system or even measure the rate of fluid flow.

pdficon Modifying Reed Switches Application Note

When cutting and forming reed switch leads it is important to use the correct support and cutting tools to avoid causing damage to the glass-to-metal hermetic seals.

pdficon Littelfuse Reed Switches MRPR-20 datasheet

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
MRPR-20-17-23 MRPR-20 P.I . 17-23 AT RoHS No 05/29/2017 PbFree No 05/29/2017 CoC_RoHS10_MRPR-20-17-23 REACH197_Declaration_MRPR-20-17-23 Yes
Does not Contain IPC_MRPR-20
MRPR-20-17-28 MRPR-20 P.I . 17-28 AT RoHS No 04/04/2016 PbFree No 04/04/2016 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-17-43 MRPR-20 P.I. 17-43 AT RoHS No 02/07/2018 PbFree No 02/07/2018 CoC_RoHS10_MRPR-20-17-43 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-22-28 MRPR-20 5494 22-28 RoHS No 02/10/2016 PbFree No 02/10/2016 CoC_RoHS10_MRPR-20-22-28 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-22-33 MRPR-20 5494 22-33 RoHS No 02/10/2016 PbFree No 02/10/2016 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-22-43 MRPR-20 5494 22-43 RoHS No 02/10/2016 PbFree No 02/10/2016 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-27-33 MRPR-20 5494 27-33 RoHS No 05/24/2017 PbFree No 05/24/2017 CoC_RoHS10_MRPR-20-27-33 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-27-38 MRPR-20 5494 27-38 RoHS No 12/26/2017 PbFree No 12/26/2017 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-32-43 MRPR-20 5494 32-43 RoHS No 02/10/2016 PbFree No 02/10/2016 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
MRPR-20-37-43 MRPR-20 5494 37-43 RoHS No 02/10/2016 PbFree No 02/10/2016 CoC_RoHS10_MRPR-20 REACH_SVHC Declaration_MRPR-20 Yes
Does not Contain IPC_MRPR-20
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