Siemens 3RT1316-A1BB40 Contactor

Siemens 3RT1316-A1BB40 is a four‑pole Sirius 3RT1 power contactor that combines robust switching with a compact S00 frame, using a 24 V DC coil to energize four main normally open contacts for AC‑1 loads. It features four main contacts (4 NO) in size S00 with screw-terminal connections and is rated for AC‑1 duty up to 18 A at 400 V, with a 12 kW reference at 400 V in typical catalog data. The unit includes a built‑in auxiliary contact to provide signaling for PLCs or interlocks, enabling integrated control and feedback without extra modules. In Siemens’ catalog for this family, the 3RT1316‑1BB40 variant is shown as a 24 V DC coil device with auxiliary contact, and Siemens notes a successor path to the 3RT2316‑1BB40 for equivalent configurations. This part is commonly employed to control motors, pumps, or fans in automation panels, delivering reliable, compact remote actuation with status signaling in industrial control schemes.