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It's the earth leakage breaker that's tripping, which means that the current going into the oven isn't the same as that coming out.
Whilst it could just be a problem with the switch or wiring etc, it's more likely that one of the elements has a fault allowing the current to go to earth.
If the oven has different settings - grill, fan oven etc, you could try setting the control knob to each in turn, with the Cocina circuit breaker in the off position, then turning that on, and see if the earth leakage breaker always trips. I'd expect it to only trip in certain positions, but that all depends on how the oven is wired. This might help to isolate the fault.
I'd also try with the light turned off, and the thermostat in off/medium/ and high settings.
