Siemens 3RH1122-1AU60 Auxiliary Contactor

Siemens 3RH1122-1AU60 is a compact auxiliary contactor in the S00 size that provides four auxiliary contacts in a 2 NO + 2 NC configuration. It is designed to operate with a 277 V AC coil at 60 Hz and uses screw terminals for straightforward wiring. This SIRIUS device is intended for control circuits that require additional normally open and normally closed contacts for feedback, interlocking, and signaling in automation and motor-control applications. As part of the Siemens 3RH1/SIRIUS family, it shares a common design language with other small-form auxiliary units, offering a small footprint suitable for panel installations where space is at a premium while expanding the available auxiliary switching in a control system. The 3RH1122-1AU60 is commonly used to provide auxiliary signaling in conjunction with main contactors, enabling reliable control logic without consuming excessive panel real estate. Its robust screw-terminal wiring supports secure, long-term connections in industrial environments, making it a practical addition for engineers designing compact control panels that require both NO and NC paths in a single, integrated module.