To put it simply, it belongs to a type that starts from receiving an input signal (that is, when the coil is energized or de-energized) and outputs a signal after a preset time delay (contact closing or opening action) Relay. The time relay is generally used in a relatively low voltage or current circuit to play a role of turning on and off a higher voltage or current. It is like providing an electric switch device for the circuit to be used for automatic control. The time relay symbol As shown in the figure below (left is power-off delay, right is power-on delay).
Function and symbol of time relay
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