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.
Dimensions and mounting
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. Mounting position is any orientation, which helps when you're squeezing it into a tight corner of the panel. 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.
Sourcing and availability
The 3RU2116-1JB1 is sourced through independent distribution channels. Pricing and current availability are confirmed at quote time against an RFQ — send the order code and quantity for a firm quote.