Momentary Contact Relay

Constant to momentary output positive input positive output relay wiring diagram.

Momentary contact relay.

Pilot wire circuits for protective relaying experience and practice 1942 1950 that a reactor and capacitor which had been con nected in series with the pilot wire insulating transformer to permit d c supervision had caused an a c transient resulting in momen tary closing of the relay contacts on. A 1 1 6 momentary relay contact bounce. Choose from our selection of momentary relays including flange mount spade terminal relays thin spade terminal relays and more. The resistor bleeds off the charge of the capacitor when positive voltage is removed from the other side of the coil.

This circuit allows an spst momentary pushbutton to act as a push on push off switch using a dpdt latching bi stable relay. The capacitor allows the coil of the relay to be energized until the capacitor stores a charge thus de energizing the coil. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. The relay only draws current when it is being switched.