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SEKI ST-30 Bimetal Thermal Switch

The SEKI ST-30 is the smallest, encapsulated bimetallic thermal cut-out in the ST series, allowing for easy integration into numerous products like electric motors and transformers.  They could also be used in battery packs and battery chargers.

The ST-30 uses a snap action bimetal strip that is factory calibrated to any setting (in 5K steps) from 50℃ to 130℃.  The bimetal disc snaps open at its predetermined setting and then closes again on cooling, thus protecting the appliance from over-temperature and/or over-current conditions.

The SEKI ST-30 is housed in a PBT resin case with an epoxy seal ensuring long-term integrity and reliability.  The standard lead-wires are 70mm long XLPE but longer versions and short bare wires can be supplied for volume applications.

Applications

  • Electric Motors
  • Battery Chargers and Packs
  • Transformers
  • Power Supplies
  • Heating Pads
  • Solenoids
  • LED Lighting

Features

  • Snap Action with Automatic Reset
  • Superior Heat Response
  • Contact Rating: 5A/250V AC (10,000 cycles)
  • Factory calibrations from 50℃ to 130℃
  • UL/cUL, VDE, CQC, KC
  • PBT Resin Case with Epoxy Sealing
  • IP45 rating
SEKI ST-30 Series Thermal Cut-outs SEKI ST-30 Thermal Cut-out Drawing