The Siemens 3RU2116-1JJ0 is a SIRIUS thermal overload relay, size S00, Trip Class 10, rated 690 V. Mounting is direct to the contactor using M3 screws. The auxiliary switch is integrated. Dimensions are 45 mm wide, 76 mm high, 70 mm deep — compact enough to fit in a shallow enclosure or a crowded sub-panel. The depth of 70 mm is the dimension that matters most when the door or cover clearance is tight.
Trip Class 10 matches the thermal characteristic of a standard squirrel-cage motor. The auxiliary contact ratings are given across the voltage spectrum: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.11 A at 220 V DC. These are the switched-current limits for the N/O and N/C contacts feeding the PLC input or the holding circuit. The 120 V 3 A rating is the strongest — useful for pilot-duty control circuits on North American panels. The DC ratings drop off sharply, so if you're switching a 24 VDC holding coil directly, the 2 A limit is the governing figure. The relay is temperature-compensated from -40 to +60 °C, meaning the trip curve stays stable across the ambient range you'd see in an outdoor cabinet or near a heat source. Power dissipation per pole is 2.2 W. In a multi-motor group starter panel with several relays stacked, that heat adds up — plan for ventilation or derating if ambient is above 40 °C.
The substance prohibition date of 10/01/2009 refers to the RoHS compliance cutoff — the part meets RoHS requirements as of that date. No further REACH or UL documentation is carried in the spec record, but the SIRIUS series is widely UL/CSA listed through Siemens' standard certifications. MTTF with high demand rate is 2,280 years.
The relay mounts directly onto the contactor — no extra DIN rail footprint. For the SIRIUS S00 frame, that means it pairs with the 3RT2 series contactors. The main circuit connection uses ring cable lugs (M3 screw), so the wiring method is a crimp-and-screw termination, not a spring cage. The screwdriver tip required is Pozidriv PZ2, shaft diameter 5 to 6 mm. The auxiliary switch is integrated, so there's no separate side-mount switch to order and install.