Description of relay circuit

Relay is an electrical control device, which makes the controlled quantity in the electrical output circuit change in a predetermined step when the change of input quantity meets the specified requirements.

Relays have a control system and a controlled system, and are usually used in automatic control circuits, playing the role of automatic adjustment, safety protection and switching circuits.

When the input quantity (such as voltage, current, temperature, etc. ) reaches the specified value, the controlled output circuit is turned on or off. Can be divided into two categories: electrical relays (such as current, voltage, frequency, power, etc. ) and non-electrical relays (such as temperature, pressure, speed, etc.). It has the advantages of fast action, stable work, long life and small size. Widely used in power protection, automation, sports, remote control, measurement and communication equipment.

Relay is an electronic control device, which has a control system (also called input loop) and a controlled system (also called output loop). Usually used in automatic control circuits, it is actually an "automatic switch" that controls a larger current with a smaller current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.