SIRIUS 3RU2116-0DC0 — Thermal Overload Relay, Size S00, Class 10
The Siemens 3RU2116-0DC0 is a SIRIUS thermal overload relay in the size S00 frame, designed for motor protection in control panels where contactor mounting is the intended fastening method. Its Class 10 trip class means it will trip within 10 seconds at 7.2× the set current under cold start — the standard for general-purpose induction motors driving pumps, fans, and conveyors where acceleration time stays under a few seconds. The relay uses a thermal bimetallic release and carries a rated insulation voltage of 690 V, covering 400 V and 480 V line-to-line systems with headroom.
Auxiliary Contact Ratings Across Voltages
The integrated auxiliary switch provides signal feedback — a normally closed contact that opens on trip. Its current-carrying capacity varies by control voltage: 2 A at 24 V, 2 A at 230 V, 1 A at 400 V, and 3 A at 120 V. For DC control circuits, it handles 0.3 A at 60 V and 0.22 A at 110 V or 125 V. At 220 V AC the rating is 0.11 A. These are the values for the tripped-signal contact, not the main power path — the relay itself does not switch motor current; it signals the contactor coil to open.
Mounting and Wiring — S00 Footprint
The S00 frame measures 45 mm wide, 87 mm high, and 70 mm deep — a compact footprint that fits standard DIN-rail assemblies when paired with the matching contactor. Fastening is via contactor mounting, meaning it snaps directly onto the contactor's rear face without additional DIN-rail space. The main circuit uses spring-loaded terminals accepting 2× (0.5 to 2.5 mm²) solid or stranded conductors. A 3 mm diameter screwdriver tip is specified for the auxiliary terminal screws. Mounting position is any orientation, which simplifies panel layout.
Sourcing and Availability
The 3RU2116-0DC0 is sourced through independent distribution channels. For current pricing and lead time, submit an RFQ against your BOM line. Availability and firm pricing are confirmed at quote time.