What does it say on it (e.g. B6, B32 etc)?
What does the label underneath it say (e.g. "downstairs sockets")?
What in the house doesn't work when it's turned off?
to the outside only the trip button shows what it is. In domestic over loaded circuits are rare, it did happen a lot in the 90's when people started fitting little tungsten spot lights in the ceiling and exceed the 6 amp rating of the MCB but you have not actually said what stops working. If everything works why reset a trip, it may be a redundant circuit.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local