Auxiliary Contacts - 3RH Range Siemens range of auxiliary contact bloacks to suit the 3RH contactors. Front mounting position Current rating; 6A Accepts cables up to 2 x 2.5mm 2 1 x block per contactor, 1 x block per relay Note * These are make before break contacts Siemens Sirius Range Contactor & Control Relays Siemens control gear for feeders up to 5.5kW. The complementary nature of the devices allows fast and simple assembly, for example, of motor starters and reversers. A perfect match between contactors, overloads, circuit breakers and accessories for the same power ratings provides a uniform panel appearance and the standard widths with no side-by-side mounting derating allows for space saving.