It is worth mentioning that some categories of circuit breakers have a free trip, ie, if the trigger is activated in the on position, internally the circuit breaker must trip. By means of a very fast cutting device, the separation of the contacts is carried out very quickly. The circuit breakers are magneto-thermal devices that act in the protection of installations and electrical 851150.00 equipment against any overload and short circuit that may occur. Therefore, the electric arc is automatically reduced by special fire extinguishing chambers in which the alternating short-circuit current will be interrupted before it passes through zero.
This form of component is properly constituted by a bimetal thermal trigger, that acts in situations of overload, and with an electromagnetic trigger element, that operates in cases of possible short circuits. Both systems are suitably individually set to values appropriate for the protection of specific loads, in the same way as in control circuits and small motors. The contacts are designed with the use of special alloys based on silver, which provides a high security against the bonding of the contacts and a high electrical durability. The circuit breaker needs to be specified through some well-defined quantities.