The Siemens 3RU2116-1CJ0 is a SIRIUS thermal overload relay in the S00 frame size, designed for contactor mounting. It provides Class 10 motor protection, meaning it will trip within 10 seconds at 7.2× the full-load current setting — the standard for general-purpose induction motors on pump, fan, and conveyor loads. The relay is rated for a maximum insulation voltage of 690 V and carries auxiliary contact ratings across the control voltage range: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V.
Mounting and Integration
This relay mounts directly onto the contactor via the fastening method listed as contactor mounting, with any mounting position allowed. Dimensions are 45 mm wide, 76 mm high, and 70 mm deep — the S00 footprint that fits standard DIN-rail enclosures and panel layouts. The main circuit connection uses ring cable lugs (M3 screw size), and the auxiliary switch is integrated into the housing. A Pozidriv PZ2 screwdriver tip (5–6 mm shaft diameter) is specified for the terminals.
Environmental and Compliance
Operating temperature range is -40 to +70 °C, with storage and transport range of -55 to +80 °C. Temperature compensation is active from -40 to +60 °C, ensuring trip accuracy across the typical industrial ambient range. The substance prohibition date of 10/01/2009 aligns with RoHS and REACH compliance expectations for this generation of SIRIUS components.