Model H-3, H-4, H-5

Metric Dimensions are shown in mm (Shown in green)
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H-3 Data Sheet  •  H-4 Data Sheet  •  H-5 Data Sheet

These snap action single operation thermal protectors operate as a high limit, single operation (non-resettable) type control. Ultra fast thermal repsonse due to the unique position of the bimetal element. As single operation thermostats, they perform like a thermal fuse with the reliability of a 100% tested bimetallic thermal control.


  • Snap action devices; quick make/quick break switching action.
  • Single Operation type thermostats. Reset temperature is less than -35°C. This prevents the thermostat from resetting under normal operating conditions.
  • Unique positioning of the bi-metallic element allows for excellent heat transfer for improved reaction time.
  • Available with exposed bi-metallic elements for even faster thermal response.
  • Phenolic resin case isolates devices from the electrical circuit and is suitable for use in high temperature applications.
  • Can be moounted directly on a heated surface.
  • Preset calibration temperature, not adjustable in the field.
  • Opposite end termination allows for flexibility of installation.
  • Factory installed lead wires or terminals available – Consult Factory.

Contact Ratings

  • H-3: 10 amps / 250V AC (resistive)
  • H-3: 2 amps / 250V DC (resistive)
  • H-4: 0.5 amps / 50V DC (resistive)
  • H-5: 15 amps / 125V AC (resistive)
  • H-5: 10 amps / 250V AC (resistive


  • H-3 and H-4: CUL, VDE
  • H-5: CUL, VDE, TUV

Calibration Temperatures

  • H-3 and H-4: 130°C to 230°C
  • H-5: 130°C to 240° C


  • Almost anywhere ultimate safety is required. Included are laser printers, fax machines, copiers and many small appliances.

Standard Marking System

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