The Siemens 3RU2116-0CJ0 is a SIRIUS thermal overload relay, Size S00, Trip Class 10. It mounts directly to a contactor and protects motor circuits against overload and phase failure. The integrated auxiliary switch provides a "Tripped" signal message — that's the note on the line item, meaning the relay's NC contact opens on a thermal trip, and the NO contact closes to flag the condition to a PLC or indicator.
Ratings and what they mean for fit
Trip Class 10 means the relay will trip within 10 seconds at 7.2× the full-load current setting — standard for standard-duty motor starting where the inrush doesn't linger. The auxiliary contact ratings cover common control voltages: 2 A at 24 V DC, 3 A at 120 V AC, 2 A at 230 V AC, 1 A at 400 V AC. If your PLC input card runs on 24 V DC, that 2 A rating is plenty for a single digital input; just don't parallel multiple loads on this one contact without checking the total draw. Rated insulation voltage is 690 V, which covers 400 V and 480 V motor circuits with headroom. The operating frequency is 50/60 Hz — no derating needed for either. Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across the panel's ambient range.
Mounting and integration
Fastening method is contactor mounting — it clips directly onto the matching SIRIUS contactor, no DIN rail required. Mounting position is any, which helps when the panel layout is tight. Dimensions: 45 mm wide, 76 mm high, 70 mm deep. Main circuit connections use ring cable lugs with M3 screws; the screwdriver tip is Pozidriv PZ2 with a 5–6 mm shaft diameter.