What is a latch relay, and where is it used?
Latch relays are usually 2-coil, 2-position relays. The coil activation of one coil will transfer the armature and contacts to the other position. Conversely, activation of the other coil will transfer the armature and contacts back to its original position. The purpose of a latching relay is to conserve energy by pulsing the coil with a short pulse and removing the power once the relay has transferred. The latch relay lends itself easily to space applications because of minimal power drain on batteries. • Explain center-off relays. When and where should they be used? A center-off relay such as a HC or ZC contactor (relay) has its contacts in a null position, when deenergized. This means that the moving contact is not making contact with either stationary contact. The relay contactor has two coils, and each coil operates the moving contact to one or the other stationary contact position. Center-off relays/contactors can do the following: – Transfer a power source to two different posit
