Miniature circuit breakers of GO range are suitable for protection from overload and short circuits, and for electric circuit installation’s sectioning.
The items are equipped with two overcurrent releases which are featuring two tripping sensitivities: one to thermic factors, for protection against low value fault currents and current overloads; the other to electro-magnetic factors, for protection against high value overcurrent (short circuits).
The tripping mechanism is of free-trip type, that is, in case of overcurrent, the circuit breaker automatically trips even if the lever is held in close position. In multi-pole devices, the poles coupling and simultaneous action is achieved through both conjunction of operating levers and by mechanism internal connection.
Miniature circuit breakers of GO range are of limitation type as they are constructed for guaranteeing, in case of short circuit, such a short tripping time to considerably limit both the current peak value and the specific energy flowing I2t (see picture 1). In this way thermic and dynamic effects on both circuit breaker and protected circuit are minimized so that damaging of cables and electrical installation apparatus is avoided.
