SEKI Thermal Cut-Outs

SEKI Controls have 40 years experience specialising in the manufacture of bimetallic thermal protectors and thermostats.  They are ideal for limiting excessively high temperatures and thus protecting home and industrial appliances from internal and external damage.

The range of SEKI thermal cut-outs provides thermal protection and temperature control from -20°C to 180°C, with all protectors available in calibration steps of 5K and a set-point tolerance of ±5K.

The ST range of thermal cut-outs and temperature limiters have a range of features such as moisture resistance and customisable lead-wires.  Unlike thermal fuses, ST series cut-outs reset automatically, allowing them to be used as a permanent safety component.

As well as the plastic case ST series limiters, the metal case CK series cut-outs feature a patented double-coating technology to prevent varnish penetration, helping to maintain component quality.

Available with a wide temperature differential, these thermal cut-out sensors are ideal for solving a range of over-temperature problems, combined with small, compact designs allowing for simple and cost-effective integration into your product or appliance.

For further technical information, see our Frequently Asked Questions section

Call us today on 01606 871680 or complete the Contact us form, to discuss your application’s thermal sensor requirements.  Using our extensive technical knowledge and innovative supplier base, we will work with you to provide the optimum solution for your product.

  • Products
  • FAQs
  • Bimetal thermal cut-out for household appliances
    SEKI ST-12 Bimetal Thermal Switch

    The SEKI ST-12 protector is an open-frame, bimetal thermal cut-out that is generally used for the thermal protection of hairdryer and hand-drier heating elements.

    • Snap-action with automatic reset
    • 13A/250VAC Contact Rating
    • Temperature set-points: 60℃ to 150℃
  • Seki ST-22 Bimetal thermal cut-out - Overheat thermal protector
    SEKI ST-22 Bimetal Thermal Switch

    The SEKI ST-22 series thermal cut-out is their most popular device.  Manufactured in high volume, this highly reliable overheat thermal protector has become an industry standard for motors & transformers.

    • Snap-Action Bimetal, Automatic Reset
    • Temperature Setting Range: 50℃ to 150℃
    • PBT Resin Case – Epoxy Sealed
  • cost-effective, reliable range of thermal protectors and thermostats from ATC Semitec
    SEKI ST-30 Bimetal Thermal Switch

    SEKI’s ST-30 thermal cut-out is the smallest in the series.  Available with calibrations from 50℃ to 150℃, the 5A/250VAC contact rating and compact size makes it ideal for integration into various products.

    • Snap-action, automatic reset control
    • Calibrations from 50℃ to 150℃
    • Insulated case with epoxy sealing
  • Cost effective over temperautre protection - electric motors
    SEKI CK Series Thermal Protection Switches

    SEKI CK series bimetal cut-outs are used for over-temperature and over-current protection of electric motors, transformers and lighting ballasts.  Calibrations from 60℃ to 160℃.

    • Snap Action Contacts
    • Contact Rating: 8A/250V AC (6,000 cycles)
    • Temperature Setting Range: 60℃ to 160℃
  • Cost effective range 1/2
    SEKI HB Series Thermal Switch

    SEKI HB 1/2″disc series thermal cut-outs offers a wide combination of contact operation, fixings and terminal types/orientations.  They are ubiquitous in small and large household appliances.

    • Normally Closed or Normally Open Contacts
    • Temperature Setting Range: -20℃ to 180℃
    • 15A/250VAC Contact Rating