Why use a relay vs a circuit breaker or switch?
By definition: RELAY: An electromagnetic device for remote or automatic control that is actuated by variations in conditions of an electric circuit and which, in turn, operates other devices (such as switches) in the same or a different circuit. CIRCUIT BREAKER: A switch that automatically interrupts an electric circuit under an infrequent abnormal condition; e.g., a fault condition such as an overload or rupture of either high voltage or high current or both. SWITCH: A device for making, breaking, or changing the connections in an electrical circuit. Usually mechanical and operated by hand. • What does normally open, normally closed mean? The word normally refers to deenergized condition of the relay (no power on coil). The second words open and closed refer to the position of the contacts at the deenergized condition. • What is the difference between 50, 60, and 400 HZ? Most AC (alternating current) relays operate on standard frequencies and voltages. 50 HZ FREQUENCY: This is a stand
