• Single Phase
  • Thermal Overload Protector (TOP)
  • Switches

Krishna 3MPI Series single phase Thermal Overloaded Protector (TOP) switches are developed for 120 and 250 VAC application. It operates in wide temperature and current ranges. Integrated heater in combination of thermostat bimetal disc provides accurate trip times under lock rotor condition for maximum protection. It have consistence performance and good reliability. Their features are designed to support anticipated technical protection requirement of next generation AC motor.

Key Features

  • Inbuilt heater to provide better current sensitivity
  • Available with variety of terminal configuration for easy mounting and handing
  • Miniature in Size
  • Customised coding and colour of coding tape can be provided
  • Positive snap action disc for contact breaks & make
  • Auto reset type
  • Wide range of current temperature setting for maximum design flexibility
  • Temperature setting as per customer specification
  • Opening (cut off) temperature is constant within ± 5° C
  • Wide selection of lead wire and insulting sleeves
  • Cadmium free contact


Krishna 3MPI (TOP) switches are used to provide safety to a wide range of domestic and industrial equipment.

Some typical applications are:

  • Dryers
  • Washing Machine
  • Single Phase Electric Motor
  • Others as per customer design and applications
  • Dish Washers
  • Vacuum Cleaner
  • Water Pump
  • Toroidal Transformer