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1/2" Disc Snap-Action Thermostats

Snap-action 1/2″ disc bimetal thermostats (or button thermostats) provide very reliable, cost-effective temperature control and thermal protection for domestic appliances and electronic circuits.  These thermal switches can be supplied with tight tolerances and narrow differentials to make very effective thermostats; or they can be calibrated with wide differentials to provide over-temperature protection as either a thermal cut-out or a thermal limiter.

ATC Semitec stocks a comprehensive disc thermostat range from leading manufacturers Asahi Keiki and PEPI EAW.

We can offer accurate temperature control from -20°C to +250°C, high switching capacities up to 16A/250VAC and numerous fixing and termination options.  Automatic reset, manual reset and electrical self-hold options make this a very flexible range of disc thermostats.  One-shot, single operation bi-metal thermal fuses and S.P.D.T. versions with “change-over” contacts are also now available.  Our disc stats carry both VDE and UL approvals.

Amongst other applications, snap-action disc thermostats can be used for surface and air-sensing thermal switch applications typically within:

  • Office automation products
  • Small domestic appliances
  • Large domestic appliances
  • Electric heating appliances

Call us today on 01606 871680 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.

  • Asahi US-622 Snap Action 1/2
    ASAHI US-622 1/2" Disc Thermostat/Thermal Cut Out

    Compact, general purpose, high quality low cost thermostat which can also be used as a thermal cut-out.

    Range of fixings available.

    • Range 0°C/+185°C (T200 Rating)
    • Automatic reset
    • N/C or N/O contacts, 100k cycles
    • Loads up to 16A/250VAC
    • Typical applications – office automation, electric ovens and water heaters
    • VDE, UL and C-UL Approvals
  • PEPI EAW KO/KS Automatic Reset 1/2"Disc Thermostat

    1/2″ disc thermostat with quick make/quick break switching action. Automatically resets at preset temperature.

    • Range -20°C/+190°C (T200 Rating)
    • Break Contact (KO) or Make Contact (KS) options
    • N/O, N/C, manual reset options
    • Loads up to 16A/250VAC
    • Gold plated contacts available
    • VDE, UL Approvals
  • PEPI EAW CO/CS High Temperature 1/2" Disc Thermostats

    High temperature 1/2″ ceramic disc thermostat with quick make/quick break switching action. Manual reset.

    • Range -20°C/+350°C (T350 Rating)
    • Break Contact (CO) or Make Contact (CS) options
    • N/O, N/C, manual reset options
    • Loads up to 16A/400VAC
    • VDE, UL Approvals
  • ASAHI US-625 High Temperature 1/2" Disc Thermostat

    High temperature ceramic 1/2″ disc thermostat /cut out with  0°C/220°C range (T290 Rating)

    • Compact ceramic snap action disc cut-out
    • Automatic reset
    • N/O, N/C contact options
    • Loads up to 10A/250VAC
    • Typical applications – office automation, HVAC, ovens and water heaters
    • VDE, UL , C-UL Approvals
  • Asahi US-802 TO-220 Compact Thermostat

    Slim space saving snap action thermostat.

    • TO-220 case, pcb mount thermostat
    • Range 40°C to 120°C in 5K increments
    • N/O, N/C contact options, 100k cycles
    • Single-point surface fixing, M3.4 hole
    • Typical applications consumer electronics, pcbs, power supply equipment
  • PEPI EAW Special Thermal Switches
    • IP65 rated moisture-proof housings
    • Brass housed temperature switches
    • One-shot bi-metal thermal fuses
    • S.P.D.T. or “changeover” versions