What Is The Return Coefficient Of The Current Relay?

 The return coefficient of the current relay is the ratio of the return value of the relay to the action value. For example, the return coefficient of an overcurrent relay is return coefficient=return current/action current. This value reflects the sensitivity of the relay. The closer the value is to 1, the more sensitive the relay is. However, relays with too high sensitivity are often inapplicable. Therefore, the relay protection has special requirements for the return coefficient of the relay, which can neither be too high nor too low.

Why is the return coefficient of the current relay always less than 1?

Current relay is an over-current action and returns when it is less than the setting value; in order to avoid the frequent start and return of the relay when the current is near the setting value, a return value is generally set, such as 0.97, and the current is less than 0.97 before returning. Therefore, the return value must be less than 1.

A relay is an electronic control device, which has a control system (also called an input loop) and a controlled system (also called an output loop). It is usually used in automatic control circuits. It actually uses a smaller current to control a larger An "automatic switch" of electric current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.