SEFUSE SM-B Thermal Fuses

SEFUSE SM-B series fuses are general purpose, one-shot thermal fuses which use a fusible alloy inside a tiny ceramic case.  The SM-B thermal fuse has a smaller ceramic body (only 2mm diameter x 6mm) when compared with our SM-A series and so can be readily used in the smallest of spaces.  It has a continuous current rating of 1A/250VAC and a 50VDC rating for battery applications.

A thermal fuse operates when the local ambient temperature reaches the fuse’s highly accurate set-point.  The solder alloy (inside the ceramic case) then melts, separates and thus breaks the electrical circuit helping to prevent the appliance or product from catching fire.

Having an insulated case, SEFUSE SM-B series thermal fuses can be directly applied to where it will be the most effective ultimate safety device.


Various uses including:

  • Electric motors, transformers & solenoids
  • Personal care appliances
  • Small appliances
  • Rechargeable battery packs
  • Component monitoring e.g. ATEX applications


  • Smallest diameter, one shot thermal fuse
  • Ceramic Fuse body: 2 x 6mm
  • Temp range; 92°C to 225°C
  • Rating: 1A/250VAC (also 50VDC ratings – call ATC to discuss)

Stock Fuses: SM092B0, SM110B0, SM125B0, SM137B0, SM146B0

SCHOTT Sefuse range of thermal fuses - ATC Semitec