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If it is a surge protector, then it often has two lights. This optional second light reports a defective safety ground. Always required first light reports protector circuits have disconnected to avert a house fire. Some glow when OK. Others glow when a failure has occurred. Consult the manufacturer's instructions.

A power strip typically has only one light to indicate power.

Both protector and non-protector strips, if minimally safe, feature a circuit breaker that disconnects all lights and receptacles.

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Q: Why is the red protecting light always on on your surge protector?
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