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Non-self-resetting, current-sensitive Thermal Protector of Type - W1

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Application: Non-self resetting and current sensitive Thermal-Protectors (TP) with normally closed contacts are utilised for overheating protection of all electric equipment or devices, especially to protect transformers according to EN 60 742. The type W1 is sensitive for temperature as well as for currents. Therefore it is recommended in all cases of dramatic rise of temperature, due to an overload current, e.g. in case of short circuit and where resetting is not permitted or desired.

Design: The thermal protector W1 is based on the well proven mechanism of Thermik´s product series 01. A defined current-sensitivity is reached by an integrated series resistor RS. The PTC heating resistor RH, parallel to the contact, effects an electrically operated self locking mechanism.
Versions :
  • CW1 without insulation cap
  • SW1 with insulation cap
  • VW1 with silicone-filled insulation cap

    Operation: If, in the case of overheating or increase in current, the rated switching temperature of the bimetallic disc is reached, this suddenly snaps over and opens the contact. When the contact is open, the heating resistor RH is activated and prevents the temperature to fall below the reset temperature of the bimetallic disc. Only after switching off the operating voltage and after a relative short cooling phase the bimetallic disc resets to close the contact.

    Series Resistor Rs: The series resistor Rs has to be adapted to each application. To protect an electrical device, the response time should be less than 20 seconds in case of a short circuit. In order to guarantee this ideal response time, a heating performance of Rs between 5 W and max. 10 W is recommended. The table on the next side will help to find an optimal resistor Rs. Due to different possibilities of adapting the protector to the electrical device, experimental tests with different protectors are recommended.



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    Item #

    Item Name

    Diameter d

    Height h

    Lengths of Insulation Cap I

    Contact Type

    Nominal Switching Temperature

    Switch Insulation

    CW1 Type - W1 Non-self-resetting, Current-Sensitive Thermal Protector without Insulation Cap 9.0 mm 5.1 mm N/A Normally Closed (NC) 70 - 160 ºC N/A
    SW1 Type - W1 Non-self-resetting, Current-Sensitive Thermal Protector with Insulation Cap 9.4 mm 5.6 mm 19.0 mm Normally Closed (NC) 70 - 160 ºC insulation cap Mylar - Nomex ®
    VW1 Type - W1 Non-self-resetting, Current-Sensitive Thermal Protector with Silicone-Filled Insulation Cap 10.4 mm 5.8 mm 19.0 mm Normally Closed (NC) 70 - 160 ºC insulation cap Mylar - Nomex ®
      Results 1 - 3 of 3 1