Why are relays numbered?
Why are relays numbered? Represents the rated operating voltage of the relay (that is, the voltage applied to the coil end), at this point some manufacturers will use some numbers to represent their internal specifications, such as HT33067 Can ignore it. Numbers of a Relay 85 and 86 are the coil pins while 30, 87, and 87a are the switch pins. Why are relays used? Relays control one electrical circuit by opening and closing contacts in another circuit. Relays are generally used to switch smaller currents in a control circuit and do not usually control power consuming devices except for...