Hager Mcb double pole 100amp , The main switch is just what it sounds like – the central switch controlling the supply of mains electricity from the meter to the consumer unit and subsequently through to the rest of your home. While RCDs and circuits are usually tripped automatically, a mains switch is going to be switched on and off manually. If you want to conduct a piece of electrical repair or are going through an emergency situation, you’ll be turning off the consumer unit’s main switch.

When you turn the mains switch off, both the incoming live and the incoming neutral power will be separated from the rest of the unit – essentially, you’ll have isolated your consumer unit, and therefore the property itself, from the mains electricity supply.

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