The Siemens 3RH1122-1BB40-ZW97 is a SIRIUS auxiliary contactor in the size S00 frame, running on a 24 V DC coil. It carries 4 contacts — 2 normally open and 2 normally closed — so it's built for signaling and interlocking duties inside a motor control center, not for switching main motor current. The coil pulls 3.2 W to close and holds at the same 3.2 W, which matters when you're budgeting a 24 V DC supply rail in the panel.
What the ratings mean for fit
This is a 4-pole auxiliary contactor — two make, two break. The contacts are rated for switching at various control voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. Those are the AC switching currents for the auxiliary circuits, not the main power path. If you're interlocking a 400 V motor starter, the 3 A rating at that voltage tells you the contact can handle the pilot duty without welding shut. The contacts are rated for 100 million mechanical operations and show a contact reliability of one incorrect switching per 100 million at 17 V, 1 mA — that's the low-energy switching spec for PLC-level signals, so it'll pick up dry contact inputs without trouble.
Mounting and environment
Mounts with screws or snaps onto a DIN rail — that's the standard panel integration for a size S00 contactor. It fits in a 45 mm wide slot, 57.5 mm tall, 72 mm deep. The front is IP20, so it's protected against finger contact but not washdown; keep it inside the enclosure. Operating temperature runs from -25 °C to +60 °C, storage from -55 °C to +80 °C, and it shrugs off 10g shocks at 5 ms — fine for a vibrating panel on a conveyor line or a pump skid. The mounting position allows +/-180° rotation on a vertical surface and up to +/-22.5° tilt, so you can orient the contactor to fit tight wireways.
Wiring and compliance
Terminals accept solid wire: two wires of 0.5-1.5 mm², two of 0.75-2.5 mm², or a single 4 mm².
Lifecycle and sourcing
This is a current-production part in the SIRIUS line. The -ZW97 suffix is a Siemens special version code.