KSD301C High Current Snap Action Thermostat

    KSD301C is a high-current bimetallic snap-action thermostat with bakelite housing, designed for precise, rapid temperature switching in heating and cooling equipment. It delivers reliable overheat protection and temperature control for motors, compressors, and high-power heating elements across home appliances and industrial devices.

 

 

What Is KSD301C

    KSD301C is a bimetallic snap-action thermostat enclosed in durable bakelite housing. Unlike gradual creep-action types, it uses energy-storing snap mechanism to switch contacts instantly at a set temperature, reducing arcing, extending service life, and providing clear on/off response.

 

How Snap Action Works

  Bimetal Disc Principle

    The core component is a dome-shaped bimetallic disc made of two bonded metals with different thermal expansion rates. As temperature changes, uneven expansion builds internal mechanical stress.

  Snap Mechanism

    The disc is structurally unstable in its original shape. When reaching the set temperature, stress overcomes resistance, causing the disc to flip rapidly with a click. This quick action opens or closes electrical contacts cleanly.

  Benefits of Snap Action

    1. Lower arcing, less contact welding and pitting

    2. Longer cycle life, up to hundreds of thousands of operations

    3. Accurate temperature switching, no unstable intermediate state

  Electrical Ratings and Applications

    KSD301C supports high-current loads for different devices:

    10A IND: Inductive loads, motors, compressors, fans in air conditioners and refrigerators

    25A: Resistive loads, medium heating elements in coffee makers and vending machines

    45A: Resistive loads, high-power heating elements in dryers, unit heaters, commercial ovens

 

Typical Applications

  Air Conditioners

    1. Compressor overheat protection

    2. Evaporator anti-frost control

    3. Crankcase heater control

  Clothes Dryers

    1. Cycling thermostat for drum temperature regulation

    2. Manual-reset safety limit for overtemperature fail-safe

  Vending Machines

    1. Heater control for hot beverage dispensers

    2. Cooling system protection for refrigerated units

  Unit Heaters and Ventilation

    1. Fan delay to dissipate residual heat

    2. Direct high-power heating element control

  Tabletop Appliances

    1. Compact fit for griddles, fryers, cookers

    2. Manual-reset safety for unattended operation risks

 

 

Why Choose KSD301C

    KSD301C combines high current capacity, rapid snap action, and stable performance. It improves safety, extends equipment life, and ensures consistent temperature control for household and commercial thermal systems.