Voltage relays

Applications and operation

These relays are used in applications such as voltage detection, catenary voltage detection, threshold control, voltage monitoring of battery chargers, etc.

In this kind of relays, the coil, vaccum impregnated or covered with an insulated resin, has an electrical resistance usualy between 100 and 40 000 Ohms.

These relays cover a current range from 10mV to 10 000 Volts. These relays, associated with classical or specific components (non-linear resistors, rectifiers, transistors, zener diodes…), have led to a considerable number of very different realizations.

Moreover, the relay operation points can be made adjustable, either by the use of micrometric adjustment contacts, or by the addition of a second winding, additional or subtractive, controlled by a rheostat.