Solid State Relays :

A solid state relay (SSR) is a non-contact semiconductor control component where the input side and output side are isolated like an electromagnetic relay (EMR), and a function which matches the ON/OFF of the input and output is provided for switching electric circuits ON/OFF using semiconductor devices.

Application Range
SSRs are not only used in industrial machinery, such as machining centers and industrial robots, but are also widely used in the following fields which support electric appliances and our daily lives.

Examples :-

  • Office equipment, such as copy machines, phototypesetting machines, facsimile, telephone switchboards, and computer terminals.
  • Equipment, such as NC machine tools, elevators, industrial robots, electric lighting, sequencers (PLCs), and temperature controllers.
  • Electric appliances, such as microwave ovens, power tools, sewing machines, air conditioners, washing machines, and refrigerators.
  • Lighting equipment, such as signals, lighting display boards and dimmers.
  • Vending machines, automatic vending machines, automatic ticket gates, ticket machines, money changers.
  • Amusement equipment, such as UFO catchers and racing games - Semiconductor manufacturing equipment, such as steppers, bonding machines, and diffusion furnaces.
  • Other various electrical equipment.
Features :-
  • Using an optocoupler (photocoupler) in the circuit realized high reliability, high speed, high frequency control and miniaturization compared with an electromagnetic relay (EMR).
  • The SSR operates on a low signal, and has excellent vibration resistance, impact resistance and moisture resistance.
  • The SSR also has excellent environmental characteristics without noise.
  • Unlimited number of switching operations.
  • Zero cross control function.
  • No operation noise.

Solid State Relay (SSR) are of 3 types -


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