Inside a faulty UK Wylex circuit breaker.

I was sent this faulty Wylex circuit breaker to take a look at. It's a common brand used in consumer units (home distribution boards) in the UK. The contacts had suffered burn damage and were not making a reliable connection. After seeing what was wrong I thought it would be good to show how the mechanism in an MCB (Miniature Circuit Breaker) works. Especially the bit that lets it still trip while the toggle is being held in the on position.

If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.