FBMOV Series Type 1 SPD Varistors

Littelfuse fused-body varistors provide complete overvoltage circuit protection

Image of Littelfuse's FBMOV Series Type 1 SPD VaristorsThe Littelfuse FBMOV Series offers complete overvoltage circuit protection in a single, compact configuration helping customers simplify their designs and reduce cost. The Littelfuse varistor surge protection fuse, combined with a varistor, offers non-fragmenting protection when subjected to high fault current (up to 200 kA). The integrated, thermally activated element opens quickly in the event of overheating during abnormal overvoltage, limited current, and intermediate current condition. The element offers quick response because of its close proximity to the MOV body.


  • A complete overvoltage circuit protection solution and compact package to help customer simplify design and save mounting space
  • High surge density device: 40 kA single 8/20 surge
  • Fault current capability up to 200,000 A without external protection
  • Capable for clearing limited current, intermediate current, and short circuit current, in the condition of abnormal sustained overvoltage condition
  • Suitable for type 1 SPD application
  • Standard operating voltage range up to 750 VAC
  • RoHS compliant
  • UL 1449 short circuit current rating test selection 39.2
  • UL 1449 intermediate current test selection 39.3
  • UL 1449 limited current abnormal over voltage test selection 39.4


ImageManufacturer Part NumberDescriptionVaristor Voltage (Min)Varistor Voltage (Typ)Available Quantity
FBMOV150M datasheet linkVARISTOR 216V 40KAFBMOV150MVARISTOR 216V 40KA216V240V192 - Immediate
FBMOV150M product page link
FBMOV130M datasheet linkVARISTOR 184V 40KAFBMOV130MVARISTOR 184V 40KA184.5V205V8 - Immediate
FBMOV130M product page link
FBMOV275M datasheet linkVARISTOR 387V 40KAFBMOV275MVARISTOR 387V 40KA387V430V0FBMOV275M product page link
FBMOV175M datasheet linkVARISTOR 243V 40KAFBMOV175MVARISTOR 243V 40KA243V270V4 - Immediate
FBMOV175M product page link
FBMOV230M datasheet linkVARISTOR 324V 40KAFBMOV230MVARISTOR 324V 40KA324V360V4 - Immediate
FBMOV230M product page link
FBMOV460M datasheet linkVARISTOR 675V 40KAFBMOV460MVARISTOR 675V 40KA675V750V4 - Immediate
FBMOV460M product page link
FBMOV440M datasheet linkVARISTOR 643V 40KAFBMOV440MVARISTOR 643V 40KA643V715V4 - Immediate
FBMOV440M product page link
FBMOV385M datasheet linkVARISTOR 558V 40KAFBMOV385MVARISTOR 558V 40KA558V620V4 - Immediate
FBMOV385M product page link
FBMOV550M datasheet linkVARISTOR 819V 40KAFBMOV550MVARISTOR 819V 40KA819V910V4 - Immediate
FBMOV550M product page link
FBMOV510M datasheet linkVARISTOR 738V 40KAFBMOV510MVARISTOR 738V 40KA738V820V4 - Immediate
FBMOV510M product page link
FBMOV420M datasheet linkVARISTOR 612V 40KAFBMOV420MVARISTOR 612V 40KA612V680V2 - Immediate
FBMOV420M product page link
Published: 2013-01-04