The Siemens 3RU2116-1JB1 is a SIRIUS thermal overload relay, size S00, Trip Class 10, rated for main circuit voltages up to 690 V. It directly mounts to a contactor or stands alone — the fastening method is stand-alone installation, so you can fix it where it sits without a DIN-rail adapter if that's what the panel calls for.
Auxiliary contact ratings — what they mean on site
The integrated auxiliary switch (design of the auxiliary switch: integrated) carries a range of voltage-dependent currents: 2 A at 24 V, 0.3 A at 60 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V. That means the same set of contacts handles both a 24 V PLC input and a 400 V contactor coil, as long as you respect the current at that voltage — no separate aux block needed.
Trip Class 10 — what it means for motor protection
Class 10 trip means the relay will open within 10 seconds at a locked-rotor current of 600 % of the full-load setting. For a motor that starts fast (conveyors, pumps, fans with light starts), that's enough time to get up to speed without nuisance tripping. If you're on a high-inertia load like a centrifuge or crusher that needs a longer start, you'd want Class 20 or 30 — but for most standard induction motors, Class 10 is the right call.
At 45 mm wide, 89 mm tall, and 80 mm deep, the S00 footprint is compact — it fits in the same slot as the matching S00 contactor. Terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded, screw-type with a Pozidriv PZ 2 tip and 5–6 mm shaft diameter.