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About Magneto-thermal Circuit Breakers
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Circuit breakers protect against indirect contacts, they are the ones that protect the equipment connected to the installation. Depending on their location, a different nomenclature is used to name them, but they are always the same type of product:
Circuit breakers consist internally of two parts, a thermal protection and a magnetic protection:
The circuit breaker must be duly chosen depending on its tripping curve, which depends on the number of times the In (Rated Current) is withstood, it will be used in one type of installation or another. The most common and most commonly used are:
B-curve: 3 to 5 times their In, they are used rather rarely, especially for long cabling distances.
Curve C: 5 to 10 times its In, most commonly used in the domestic environment.
We call the breaking capacity of a circuit breaker the maximum current that it is capable of breaking. If the current generated by a short-circuit, for example, is higher than the breaking capacity, the circuit breaker will trip but current could continue to flow by means of an electric arc.
By overloading: This is usually due to an excessive number of connected devices.
Short-circuit: Due to overheating of the conductors, a very high current is produced in a short period of time.
This device can be automatically reset in the event of a transiently high current. If this current occurs again several times, it will open the contact and can only be reset manually.
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