What is the difference between a conventional relay and a solid state relay

Traditional relays, that is, electromagnetic relays. Traditional relays and solid state relays mainly have the principle, structure, characteristics and other aspects of the difference, as follows:

One, the principle is different

Traditional relays: the principle of traditional relays is electromagnetic induction, through the electromagnet's power to control the circuit on and off.

Solid state relay: the principle of solid state relay is to use isolation devices to achieve the isolation of the control side and the load side.

Second, the structure is different

Traditional relays: traditional relays are mainly composed of electromagnets, armatures, springs and moving contacts, static contacts.

Solid state relay: solid state relay is mainly composed of input circuit, isolation (coupling) and output circuit.

Three, different characteristics

Conventional relays: conventional relays have a simple drive, good isolation, good short-term overload tolerance and other characteristics.

Solid state relay: solid state relay has a high life expectancy, high sensitivity, small control power, good electromagnetic compatibility and other characteristics.

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