The Siemens 3RU2116-1GB0 is a SIRIUS thermal overload relay, size S00, with CLASS 10 trip response. It mounts directly onto a contactor. Rated for 690 V and delivering 2.2 kW at 400 V (6.3 A at 480 V, 3 kW at 500 V, 6.3 A at 600 V, 4 kW at 690 V), this relay covers a solid chunk of low-to-medium motor sizes. The integrated auxiliary switch signals a tripped state — the part's note reads "for message 'Tripped'" — so your PLC or HMI gets a clean digital indication without an add-on block.
Fastening method is contactor mounting — it clips onto the matching S00 contactor, saving DIN-rail space. The main circuit terminals accept screw-type connections: 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded. Use a Pozidriv PZ2 bit with a 5–6 mm shaft diameter. Strip length? The spec doesn't call it out, but 8–10 mm is typical for this terminal class. The S00 size keeps the fill factor low in crowded panels.
Storage and transport tolerance goes from -55 to +80 °C. The part is marked with a substance prohibitance date of 10/01/2009, indicating RoHS compliance from that point forward.