What It Is and What It Does
The Siemens SIRIUS 3RU2116-1GB0-ZX95 is a size S00 thermal overload relay, designed to protect motor circuits against prolonged overcurrents and phase-loss conditions. Its thermal bimetallic release mechanism tracks the motor's thermal state, and the Class 10 trip characteristic means it will open the circuit within 10 seconds at 7.2× the setting current, matching the heating curve of standard induction motors during a stall or locked-rotor event. Rated for main circuit voltages up to 690 V, it handles the common 400 V, 480 V, and 600 V industrial supplies. The auxiliary switch is integrated, and the relay itself provides a "Tripped" signal contact — the note on the order code identifies this variant as having a specific message for that tripped state, useful for remote annunciation in a PLC or HMI.
Mounting and Wiring
Mounts directly onto a contactor via the contactor mounting fastening method — no separate DIN-rail footprint needed, which saves panel space. The screw-type terminals on the main current circuit accept solid or stranded conductors: 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²). The screwdriver shaft requires a 5–6 mm diameter with a Pozidriv PZ 2 tip. Mounting position is any, giving flexibility in tight enclosures. The relay's dimensions — 45 mm wide, 76 mm high, 70 mm deep — fit within the standard S00 contactor envelope.
Environmental and Compliance
Operating temperature range is -40 to +70 °C, with storage and transport from -55 to +80 °C. Temperature compensation is active from -40 to +60 °C, ensuring the trip curve stays accurate across the working range. The relay carries a substance prohibitance date of 10/01/2009, indicating RoHS compliance. MTTF with high demand rate is 2,280 years, reflecting the robust design of the SIRIUS platform for continuous industrial duty.