difference between relay and circuit breaker

The Relay is a switching and sensing device, but the Circuit breaker is an isolating or disconnecting device. Relays operate on low power input voltage. ... The Relay is used to control or select one among many circuits, whereas Circuit Breaker is one per circuitRelay acts an electrical amplifier for discrete signal.




BASISRELAYCIRCUIT BREAKER
PrincipleThe Relay is a switching device which gives a signal to the circuit breaker as soon as the fault occurs in the power system.Circuit breaker breaks the circuit automatically when receives the signal from the relay.
WorkingThe Relay does not break the contact. It only senses the error and send the signal to the circuit breaker.It breaks the circuit contacts.
Type of deviceThe Relay is a switching and sensing device.The Circuit breaker is an isolating or disconnecting device.
VoltageRelays operate on low power input voltage.The Circuit breaker is an automatic on load device.
Usability
It is used to control or select one among many circuits.

It uses one per circuit.
As an amplifierRelay acts an electrical amplifier for discrete signal.Circuit breaker does not act as an amplifier.
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The detailed description of Difference Between Relay and Circuit Breaker is described below.

  • The Relay is a switching device which gives a signal to the circuit breaker as soon as the fault occurs in the power system. Circuit breaker breaks the circuit automatically when receives the signal from the relay.
  • The Relay does not break the contact. It only senses the error and send the signal to the circuit breaker where as Circuit Breaker breaks the circuit contacts.
  • The Relay is a switching and sensing device, but the Circuit breaker is an isolating or disconnecting device.
  • Relays operate on low power input voltage. The Circuit breaker is an automatic on load device.
  • The Relay is used to control or select one among many circuits, whereas Circuit Breaker is one per circuit.
  • Relay acts an electrical amplifier for discrete signal. Circuit breaker does not act as an amplifier.

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