It is a MB Vigi add-on module for 4 poles Compact NSX 400/630 and EasyPact CVS 400/630.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 400/630 or EasyPact CVS 400/630 characteristics.It is a MB type module in 4 poles version, self-powered by the input voltage.The operational voltage for the Vigi add-on is from 440VAC to 550VAC 50/60Hz.The sensitivity is adjustable from 300mA to 30A, the time delay is also adjustable.The dimensions of the circuit breaker equipped with this module are 185mm x 355mm x 110mm.