The Siemens SIRIUS 3RU1116-1AB0-ZW97 is a size S00 thermal overload relay with CLASS 10 trip characteristic, designed for motor protection in industrial control panels. It mounts directly to a contactor (contactor mounting) and occupies a 45 mm wide footprint on the DIN rail, with a depth of 78 mm and height of 87 mm. The IP20 front protection and ATEX approval (DMT 98 ATEX G 001) suit it for use in potentially explosive atmospheres where overcurrent protection must fail safe on demand.
Key ratings and what they mean for fit
CLASS 10 trip class means the relay opens within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts. The 3-pole main circuit handles three-phase loads, and the screw-type terminals on both main and auxiliary circuits accept solid conductors from 0.5 mm² up to 2.5 mm² (2× per clamp), with AWG equivalents from 20 to 14 for the main circuit. For finely stranded conductors with ferrule, the same cross-section range applies. The auxiliary contacts are rated at 1 A at 24 V, 3 A at 120 V, and 2 A at 230 V — sufficient for signaling to a PLC or safety relay. Surge voltage resistance of 6 kV and shock resistance of 8g / 10 ms indicate the relay withstands electrical transients and mechanical vibration common in motor starter panels near pumps or conveyors. The operating temperature range of -20 to +70 °C covers most indoor industrial environments, while storage and transport range of -55 to +80 °C allows for cold-weather shipping without damage. Relative humidity during operation can reach 100 % — condensation is acceptable, though the IP20 front means the relay itself is not sealed against water jets; it relies on the enclosure for washdown duty. Mounting position is flexible: the relay can be rotated ±135° on a vertical surface or tilted ±45° forward/back, which simplifies panel layout when space is tight. Clearance requirements are minimal — 0 mm upwards, forwards, and backwards, 6 mm at the side, and 0 mm downwards — so it can be packed tightly against adjacent components on the DIN rail.
Deployment context
This relay is designed for contactor mounting — it snaps directly onto a Siemens SIRIUS S00 contactor, forming a compact motor starter assembly. The 45 mm width matches the contactor footprint, and the screw terminals allow field wiring with standard tools. In a panel, it integrates as the overload protection element in a motor control center (MCC) or standalone starter, with the auxiliary contacts feeding status back to the control system.