Its function is to transform the line voltage to the relay logic voltage and handle the contactor coil inrush current. Contactors with AC coils draw about 5 times rated current until the magnetic ...

The basic function of a relay is to switch on power to a load using an electrically isolated, low-power control signal. Hitherto, electromechanical relays have been the components of choice to perform ...

A Relay is generally used when it is required to control a circuit by a separate low-power signal, or when several circuits must be controlled by one signal. They are classified into many types, a ...

Relays function in the opposite direction as well. Perhaps you want the loss of 120 volts to control a lower Image credit: FDominec / CC BY-SA 3.0 voltage circuit, such as triggering an alarm from a ...

This simple temperature relay circuit can be used to signal a fire or setpoint for temperature monitoring function. You need to adjust P1 so that T1’s base voltage is 0.5V smaller than the emitter ...

Here is a simple relay actuating circuit that can be used to energise relays with a few millivolts as the input.

Often, each electrical component is tested individually, and only small outages are required to allow for this testing. During a shutdown or turnaround is a great time to test the protective trip ...