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Thanks for replying gents, it's labelled a residual current operated circuit breaker with a test button.

Lighting unit that keeps tripping main breaker.

I have a ceiling light that can be switched on via 2 switches. When I switch it on either one the main breaker trips. Its quite simple wiring inside so I thought that there might be a problem with the transformer inside. I took down the light and replaced it with a known working identical model...