Cooker Tripping When Turning Off

[Paul Taylor]

My daughter has just started renting a house. The original 50cm cooker turns on fine . You can have the oven and a single large plate and small plate on the hob on without any issues but it trips the MCB if you switch on any of the additional hob plates. It also trips if you turn anything back to the off position regardless of what is turned on, such as one hob plate.

The landlord assumed it was the cooker and replaced it with a brand new cooker but the faults remain. I’m thinking it could be a faulty 32A MCB. Anyone with any other ideas?

 

[Gotha_Prince]

If it’s tripping when turning things off, that screams wiring issue, not the cooker itself. Could be a loose neutral or bad connection in the terminal block or outlet. I’d pull the plate and check for heat damage or corrosion before blaming the breaker.

 

[PGB1]

Does your circuit breaker incorporate arc-fault protection?
Quite often cooking or heating appliances trip arc fault devices when they reach temperature or turn off. The little arc from the appliance's relay or thermostat is enough to trip some. In my home, I had to replace an arc fault breaker because a new toaster tripped the existing one every time the cycle ended.

Note that this is coming from the U.S., where arc fault circuit breakers are common. Please pardon this post if your location does not use them.

Paul

 

[Carrot_]

I had the same problem before, in my case there was a 32A MCB faulty
if it has been overloaded multiple times or is old, its internal components may be damaged, causing it to trip even under normal loads

 

[Alan]

Since the replacement cooker didn’t change anything, I’d be looking closely at the circuit rather than the appliance. A worn MCB can trip under perfectly normal conditions, but nuisance-tripping during both ON and OFF transitions can also show up when the neutral is loose or the cable run has a bad connection somewhere. If the rental is older, it’s worth checking if the cooker circuit is actually sized correctly or if someone tied in something they shouldn’t have. Do you know if the landlord had an electrician test the circuit yet?