Main isolator switch this device is used as a circuit breaker to prevent the rish of an electric shock. If has a 100 AMP fuse. It has a yellow lock switch to lock the switch to the on position although this would never be advised. Please see a qualified electrician. For total isolation of all circuits Lockable switch Terminal Capacity: 50mm² To BSEN 60947-3 For use in GET consumer units 100 AMP Main Isolator Switch
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