Insulation class

Defines the type of device insulation in terms of grounding in one of three classes.

• Class I. The device is grounded. Any electrical faults, internal or external, or caused by the load, are cleared via the grounding circuit.

• Class II. The device is not connected to a protective conductor. User is protected by reinforced insulation around the live parts (an insulating case and no contact with live parts, i.e. plastic buttons, moulded connections, etc.) or double insulation.

• Class III. The device may be connected only to SELV (safety extra-low voltage) circuits.

The PowerPacT circuit breakers are class II devices (front) and may be installed through the door in class II switchboards (standards IEC 61140 and IEC 60664-1), without reducing insulation, even with a rotary handle or motor mechanism module.