What this overload relay does and how it fits
The Siemens SIRIUS 3RU2116-1EB0-ZX95 is a Size S00 thermal overload relay with a CLASS 10 trip characteristic, designed to protect motors against overload and phase failure. It mounts directly onto a contactor — the fastening method is contactor mounting — so it integrates into the motor starter stack without extra DIN-rail space. The relay is rated for main circuit voltages up to 690 V and carries a "Tripped" message contact (the Note field on this variant signals that auxiliary contact state). CLASS 10 trip means the relay will open within 10 seconds at 7.2× the current setting — fast enough to protect standard squirrel-cage induction motors during a locked-rotor event. The S00 frame size keeps the footprint tight: 45 mm wide, 76 mm tall, 70 mm deep, which fits neatly into a motor control center bucket or small panel enclosure.
Switching capacity and auxiliary contact ratings
The integrated auxiliary switch handles a range of control voltages: 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. That covers most PLC output cards and control transformer secondaries you'll find in a 24 VDC or 120 VAC panel. For lower-voltage DC circuits, it also switches 0.3 A at 60 V and 0.22 A at 110/125 V. Power dissipation per pole is 1.9 W, so three poles running at full load add about 5.7 W of heat inside the enclosure — factor that into your thermal budget if the panel is densely packed.
Installation and wiring notes
Mounting position is any — no derating needed for horizontal or vertical orientation. The main circuit terminals are screw-type, accepting 2× (0.5…1.5 mm²) or 2× (0.75…2.5 mm²) solid or stranded copper. Use a Pozidriv PZ 2 tip with a 5–6 mm diameter shaft. Temperature compensation is active from -40 °C to +60 °C, so the trip curve stays accurate across most industrial ambient conditions. Operating temperature range is -40 °C to +70 °C; storage and transport range is -55 °C to +80 °C. MTTF with high demand rate is 2,280 years — a reliability figure that supports continuous-duty applications.