Solid State Relay

 

Solid State Relay

Solid State Relay

Solid State Relay is a semiconductor equivalent of the electromechanical relay which can be used to control AC or DC electrical loads without the use .


Unlike standard electro-mechanical relays (EMRs) and contactors which use coils, magnetic fields, springs and a variety of mechanical contacts to control and switch a power supply. 

The Solid State Relay, or SSR as it is more commonly known, has no moving parts but instead uses the electrical and optical properties of solid state semiconductors to perform its input to output isolation and power switching functions.

Just like a normal Electrical Relay, the SSR’s provides complete electrical isolation between their input and output contacts with its output acting like a conventional electrical switch in that it has very high, almost infinite resistance when nonconducting (open), and a very low resistance when conducting (closed).

Solid state relays (SSR) can be designed to switch both AC or DC currents by using an SCR, TRIAC, or switching transistor output instead of the usual mechanical normally-open (NO) contacts.

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