Open temperature switches / current switches or time switches (A series)

Data sheet

You will receive a complete overview of all variations in connection with all the technical data in the following data sheet:

A10, A20, A30, A40

Type series A switches are based on a complex system consisting of a contact spring unit and a thermo-bimetal snap-disc. When heating up to the fixed switching point, the contact opens, and thus interrupts the power circuit.

They are very flexible to use: Due to the different types of reset, and the adjustable current sensitivity for rapid shutdowns, the A switches offer a very good solution, especially in very specific safety concepts.

Temperature monitor with automatic reset A10: After a certain cooling phase (temp. hysteresis) the contact switches back automatically.

Temperature limiter with a manual reset A20: After opening the contacts, and the subsequent cooling the contacts remain open until a manual reset is performed on the reset pin.

Temperature monitor with electr. self-retaining A30 (230V) / A40 (120V): After opening the contacts the switch is heated by a parallel connected resistor, and thus kept open. The automatic reset is only performed through a mains disconnection, or off-switching of the device in which the temperature monitor is installed.

  • Combination of temperature and current sensitivity ith the option to set a trigger time
  • Switching current up to 16A
  • special versions for printed circuit boards (SMD, THT)
  • Applications in moving air:
    Radiator fan, heating fan, hair dryer, dryer
  • Thermal motor protection
  • Controller
  • Limiter
  • Safety switch
Application areas
  • Domestic appliances
  • Dryer
  • Cooking devices
  • Radiant warmers
  • Heaters and heating Elements
  • Fan heater, hand dryer
  • Automobile: Radiator fan


Do you have questions about the product?
Please contact us directly.

Microtherm Sentronic GmbH

   +49 7231 787-0