MARR-5 Series - 19.7mm Reed Switch

Series: MARR-5
Obsolete: 2017 -07-17 Replaced ByMVSR-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 2.66mm diameter (0.775" x 0.105") glass envelope. Capable of high voltage switching of up to 1000Vdc at 1mA. Available sensitivity range of 17-38 AT. High insulation resistance of 1012 ohms minimum and contact resistance of less than 100 milliohms. Ideally suited for reed relay high breakdown voltage applications, security, metering, limit sensing, telecom and office equipment and automotive applications.


  • Normally open switch capable of switching 1000Vdc up to 1mA
  • Minimum breakdown voltage of 2000Vdc
  • Available sensitivity range of 17-38 AT


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


  • Reed relays
  • Security
  • Limit switching
  • Industrial controls
  • Office equipment
  • Telecom

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
Replaced By: MVSR-20-17-28
1010000.520000.117 to 2819.6956.77A:SPST-NO-75° to 125°C
Replaced By: MVSR-20-22-28
1010000.520000.122 to 2819.6956.77A:SPST-NO-75° to 125°C
MARR-5-22-331010000.520000.122 to 3319.6956.77A:SPST-NO-75° to 125°C
Replaced By: MVSR-20-27-33
1010000.520000.127 to 3319.6956.77A:SPST-NO-75° to 125°C
Replaced By: MVSR-20-32-38
1010000.520000.132 to 3819.6956.77A:SPST-NO-75° to 125°C
Obsolete: 2017 -12-04
Replaced By: MVSR-20-17-23
1010000.520000.117 to 2319.6956.77A:SPST-NO-75° to 125°C
Obsolete: 2017 -08-22
Replaced By: MVSR-20-27-38
1010000.520000.127 to 3819.6956.77A:SPST-NO-75° to 125°C

pdficon Reed Switch Selection Guide

A quick reference guide to selecting reed switches for electronic applications

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pdficon Littelfuse Reed Switches MARR-5 datasheet

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 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.

Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
MARR-5-17-23 MARR-5 1221 17-23 RoHS No 12/03/2013 PbFree No 12/03/2013 Yes
MARR-5-17-28 MARR-5 1221 17-28 RDSW RoHS No 12/03/2013 PbFree No 12/03/2013 Yes
MARR-5-22-28 MARR-5 1221 22-28 RoHS No 12/03/2013 PbFree No 12/03/2013 Yes
MARR-5-22-33 MARR-5 1221 22-33 RoHS No 08/27/2014 PbFree No 08/27/2014 Yes
MARR-5-27-33 MARR-5 1221 27-33 RoHS No 12/03/2013 PbFree No 12/03/2013 Yes
MARR-5-32-38 MARR-5 1221 32-38 RoHS No 12/03/2013 PbFree No 12/03/2013 Yes
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