It is a MH Vigi add-on module for 4 poles Compact NSX 250 and EasyPact CVS 250.It provides an earth-leakage protection when installed directly on the device terminals.It directly actuates the trip unit in case of insulation fault.The addition of this Vigi add-on module does not modify Compact NSX 250 or EasyPact CVS 250 characteristics.It is a MH type module in 4 poles version, self-powered by the input voltage.The operational voltage for the Vigi add-on is from 200VAC to 440VAC 50/60Hz.The sensitivity is adjustable from 30mA to 10A, the time delay is also adjustable.The dimensions of the circuit breaker equipped with this module are 140mm x 236mm x 86mm.