Relays are discrete devices are used to allow a low power logic signal to control a much higher power circuit. The relay isolates the high power circuit, helping to protect the lower power circuit by providing a small electromagnetic coil for the logic circuit to control

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When a building has too much electricity flowing through it, a circuit breaker or fuses help cut the power. This occurs so the problem can be fixed without potential damage to health or property. It's also important to have a well-functioning circuit breaker when performing routine electrical work around the house.