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SEKI ST-30 Bimetal Thermal Switch

SEKIs ST-30 has the smallest size of the ST series, allowing for easy integration.
The ST-30 uses a snap action bimetal strip in PBT resin case with epoxy seal to allow temperature control of your device, preventing over heating and thermal damage by stopping current flow.


  • Electric Motors
  • Battery Chargers
  • Transformers
  • Power Supplies
  • Heating Pads
  • Fluorescent Ballasts
  • Insect Repellent
  • Solenoids
  • LED Lighting


  • Snap Action with Automatic Reset
  • Superior Heat Response
  • Contact Rating: 5A/250V AC (10,000 cycles)
  • Temperature Setting Range: 50℃ to 150℃
  • UL/cUL, VDE, CQC, KC
  • PBT Resin Case with Epoxy Sealing
  • IP45 rating
SEKI ST-30 Line Drawing I ATC Semitec