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 ...

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 ...

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 ...

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 ...

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

1. The well-established relay-driving circuit uses an optocoupler to isolate the grounds and noise coupling between the low-voltage digital-control signal circuit (left) and the relay as load (right).

Electroswitch control switch relays (CSR) combine the function of a control switch with a remote-controlled solenoid, allowing one device to do both the manual and supervisory control function in the ...

Interrupting low-voltage circuits handled by general-purpose relays is fairly straightforward. However, as circuit voltage increases, so too does the difficulty. Interrupting a kilovolt circuit with ...