SIRIUS 3RU1116-1DC1 thermal overload relay
The Siemens 3RU1116-1DC1 is a SIRIUS thermal overload relay, size S00, designed to protect AC motor circuits against overload and phase failure. It is a CLASS 10 device, meaning it will trip within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a stall or locked-rotor event. The relay mounts stand-alone on a DIN rail or directly in the panel, with a 45 mm width footprint that fits tightly in a crowded enclosure. Rated for AC-3 duty up to 690 V, this relay handles the switching and protection demands of motor starters in industrial control panels. The IP20 front protection means it is suitable for installation inside a cabinet where no washdown or outdoor exposure occurs. Cage clamp terminals on the main circuit accept 2x (0.5... 2.5 mm²) solid or 2x (0.5... 1.5 mm²) finely stranded with ferrule — a clean, vibration-resistant connection for panel wiring.
Integration and mounting
Mounting position is flexible: the relay can be installed on a vertical surface with ±135° rotation and ±45° tilt front-to-back. Stand-alone installation means it does not require a separate contactor base — it clips directly onto the mounting rail or panel. The 78 mm depth and 92 mm height fit standard S00 form factor enclosures. Side clearance of 6 mm is needed for ventilation and wiring access.
Environmental and compliance
Operating temperature range is -20 to +70 °C, with storage and transport tolerance from -55 to +80 °C. The relay withstands 100 % relative humidity during operation and shock up to 8g for 10 ms. It carries ATEX protection type DMT 98 ATEX G 001, suitable for use in potentially explosive atmospheres when installed per the relevant directive. Surge voltage resistance is rated at 6 kV, and the maximum operating altitude is 2 000 m without derating.