4p 100/5A current transformer module INV/INS NSX100-250 circuit breaker accessories. Product series: INS250, NSX100...250, INV100...250 - Series: Compact - Device short name: Current transformer module - Product or component type: Transformer - Device application: Control - Compatible product family: Compact - Compact INS circuit breaker, Compact - Compact NSX circuit breaker, Compact - Compact INV circuit breaker - Description of poles: 4P.