What it is and what it does
The Siemens 3RU1116-1FC1 is a SIRIUS thermal overload relay in size S00, designed to protect motors against overload and phase failure by tripping according to CLASS 10 characteristics. Rated for AC-3 duty up to 690 V, it handles motor switching loads common in conveyor, pump, and fan applications within control panels. The cage clamp terminals on the main current circuit accept solid conductors 2x (0.5... 2.5 mm²) or finely stranded with core end processing 2x (0.5... 1.5 mm²), simplifying wiring in DIN-rail enclosures.
Key ratings and what they mean
CLASS 10 trip means the relay will open within 10 seconds at 7.2× the set current, matching the thermal withstand of standard induction motors during a locked-rotor event. The S00 frame size (45 mm wide, 92 mm high, 78 mm deep) fits the compact footprint of Siemens SIRIUS contactor assemblies, allowing direct mounting without additional adapters. IP20 on the front means the relay is touch-safe for panel installation but not rated for washdown or outdoor exposure. With a surge voltage resistance of 6 kV, it withstands typical switching transients in industrial power distribution without nuisance failure.
Integration notes
Mounts on a vertical surface with ±135° rotation and ±45° tilt to front/back, giving flexibility in panel layout while maintaining clearance: 0 mm upwards, forwards, and backwards; 6 mm at the side. Operates from -20 to +70 °C and stores from -55 to +80 °C, covering most indoor industrial environments without derating. Shock rated at 8g / 10 ms, suitable for mounting on machinery subject to vibration from conveyors or compressors.