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How do safety switches work?
Safety Switch Installation: The current flowing to an appliance, on a normal power circuit, returns through the neutral wire. If the circuit is compromised, the electricity can leak to earth through a person in contact with the appliance, causing death or serious injury.
A safety switch detects the loss of power from the circuit and cuts the supply of electricity in as little as 30 milliseconds – 0.003 seconds. Importantly, this response time is faster than the critical section of a heartbeat, and therefore significantly reduces the risk of death or serious injury.