MS Series - High Speed Fuse Microswitch

Series: MS
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Littelfuse MS Series external mount Microswitches offer permanent blown fuse indication to PSR Series High-Speed Square-Body Semiconductor Fuses. They have one normally open (N.O.) and one normally closed (N.C.) contact rated for 4A, 250Vac.

These microswitches have a visual red flap or arm indicator that releases after fuse blown condition and can also be used for resetting the microswitch contacts.


  • Available in two sizes to fit PSR Series Fuse Case Sizes 30 - 33 and 70 - 73
  • Internal microswitch UL Listed
  • Red flap visual indicator and contact reset mechanism
  • Minimum positive operating voltage and current at 4V/1mA

Access specifications, certifications, check availability and order parts below

Catalog #StockSamples
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s)
MS3H1000C INDICATOR SWITCH SQUARE BODY 1000V RoHS No 10/30/2019 PbFree No 10/30/2019 CoC_RoHS10_MS3H1000C_10-30-2019 REACH205_Declaration_MS3H1000C_01-29-2020 No
Does not Contain
MS7H1500C INDICATOR SWITCH SQUARE BODY 1500V RoHS No 12/11/2019 PbFree No 12/11/2019 CoC_RoHS10_MS7H1500C_12-12-2019 REACH205_Declaration_MS7H1500C_06-01-2020 No
Does not Contain
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