This auxiliary contact block provides 4 NO/NC signal contacts for use with MasterPact MTZ2 and MTZ3 circuit breakers, covering the OF, SDE and PF device positions. It is used for control signalling, switching low-power control circuits with breaking capacities ranging from 6 A AC-12 at 240/380 V AC down to fractional-amp DC ratings at 125 V and 250 V DC, and a minimum load rating of 100 mA at 24 V. It is typically fitted within control panels to relay circuit breaker status information to control and monitoring systems.