Product Overview and Key Ratings
The Siemens 3RU1116-1DB0-ZX95 is a SIRIUS thermal overload relay in Size S00, designed for 3-pole motor protection with a Class 10 trip characteristic. Class 10 means it will trip within 10 seconds at 7.2× the set current, which is the standard for standard induction motor starting — adequate for most pump, fan, and conveyor applications where the start-up transient is brief. It mounts directly onto a contactor (fastening method: contactor mounting), integrating into the SIRIUS modular system without additional wiring brackets. The front face carries an IP20 protection class, suitable for enclosed panel environments where accidental finger contact is the concern. The relay carries ATEX approval (DMT 98 ATEX G 001), permitting use in potentially explosive atmospheres — a key requirement for tender specifications in chemical, oil & gas, or grain-handling installations. For audit purposes, the ATEX certificate number should be cross-referenced with the installation zone classification.
Electrical and Environmental Ratings
Auxiliary contact ratings are specified across multiple control voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. These figures govern the pilot duty capability — for a 24 VDC PLC input, the 1 A rating is more than sufficient; for a 230 VAC contactor coil, the 2 A rating provides headroom for inrush. Surge voltage resistance is rated at 6 kV, which aligns with IEC 60947-1 overvoltage category III for fixed-installation equipment. Operating temperature range is -20 to +70 °C, with storage and transport range extending to -55 to +80 °C. The relay withstands 100 % relative humidity during operation — relevant for high-condensation environments like wastewater lift stations. Shock resistance is specified at 8g for 10 ms, and the mounting position allows rotation of ±135° on a vertical surface plus ±45° tilt front-to-back, giving flexibility in tight panel layouts.
Termination and Wiring
Both main and auxiliary/control circuits use screw-type terminals. The main circuit accepts solid conductors: 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), with AWG equivalents of 2x (20... 16), 2x (18... 14), and 2x 12. Finely stranded conductors with core-end processing follow the same cross-section ranges. Auxiliary contacts accept 2x (20... 16) and 2x (18... 14) AWG. Dimensions: 45 mm width, 87 mm height, 78 mm depth. The 45 mm width matches the standard S00 contactor footprint, so it occupies one 45 mm module on a DIN rail when mounted to the contactor. Clearance requirements: 0 mm upwards, forwards, backwards, and downwards; 6 mm at the side.