It is said to be a unique method of meeting fire-safety Building Regulations and has been specially designed for buildings with duplicate power supplies. In the event of a fire or mains failure, the changeover panel automatically switches mains electricity from one supply to another.

Electrically and mechanically interlocked to ensure the isolation of both supplies, this changeover panel is backed up by both electrical supplies. A 3-phase monitor supervises loss of phase or undervoltage. A lamp indicator shows supply and switching status, and there is a key switch to facilitate testing.

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