The Siemens SIRIUS 3RU2116-1GB0-ZW96 is a thermal overload relay in the S00 frame size, designed for direct contactor mounting to protect motors against overload and phase failure. Trip Class 10 means it will trip within 10 seconds at 7.2× rated current, matching the thermal curve of standard IEC induction motors during start-up. The integrated auxiliary switch provides a 'Tripped' signal contact for the control system.
What the ratings mean for fit
Rated insulation voltage of 690 V covers 400 V and 480 V line supplies common in European and North American panels. The auxiliary contact ratings span the control voltage range you will see: 2 A at 24 V DC and 230 V AC, 3 A at 120 V AC, and derated to 0.3 A at 60 V DC and 0.22 A at 125 V DC — enough for a PLC digital input or a contactor hold coil on the same rail. Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across the enclosure temperature range without manual adjustment. Operating ambient extends from -40 to +70 °C, storage and transport from -55 to +80 °C. Screw terminals accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire, with a Pozidriv PZ 2 screwdriver tip and 5–6 mm shaft diameter for the main circuit connections.
Mounting and integration
Fastens directly to the contactor via the contactor mounting method — no DIN rail required for the relay itself, though the contactor typically snaps onto a 35 mm DIN rail. Mounting position is any orientation, which simplifies panel layout in tight enclosures. Depth of 70 mm, width 45 mm, height 76 mm; the S00 footprint matches the smallest SIRIUS contactor frame. Power dissipation per pole is 2.2 W at rated current — account for 6.6 W total in the enclosure thermal budget when the motor is running at full load.