What it is and what the ratings mean
The Siemens 3RU2116-0FB0-ZX95 is a SIRIUS thermal overload relay in the Size S00 frame, designed to protect motors against overcurrent and phase failure by monitoring the motor current and tripping the associated contactor when the thermal model reaches the trip threshold. Trip Class 10 means the relay will trip within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a locked-rotor condition, but not so fast that it nuisance-trips on normal inrush. The integrated auxiliary contact is marked "for message 'Tripped'" — it changes state when the overload relay has operated, giving the control system a positive indication that the motor has been disconnected due to overload or phase loss. Rated insulation voltage of 690 V covers 400/480 V line-to-line systems with margin, and the auxiliary contact is rated for switching at common control voltages: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V.
Where it fits and how it mounts
Size S00 is the smallest SIRIUS overload relay frame, intended for direct mounting onto the corresponding SIRIUS contactor (contactor mounting) — no separate DIN-rail footprint needed, saving panel space. Mounting position is any, which simplifies cabinet layout when space is tight. Main circuit connections are screw-type terminals accepting 2× (0.5…1.5 mm²) or 2× (0.75…2.5 mm²) solid or stranded wire; the screwdriver tip required is Pozidriv PZ2 with a 5–6 mm shaft diameter. Dimensions are 45 mm wide, 76 mm high, 70 mm deep — a compact footprint that fits comfortably in a standard 600 mm deep enclosure with room for wiring.
Environmental and compliance
Operating temperature range is -40 to +70 °C, with temperature compensation active from -40 to +60 °C, meaning the trip curve stays accurate across the vast majority of industrial environments without manual adjustment. Storage and transport range extends from -55 to +80 °C, so the relay can sit in a spare-parts cabinet in an unconditioned warehouse without issue. Substance prohibitance date of 10/01/2009 indicates RoHS compliance per EU directive 2002/95/EC, and the SIRIUS series carries CE and UL/CSA approvals as standard. MTTF of 2 280 years at high demand rate reflects the electromechanical simplicity of a thermal bimetallic design — this is a fit-and-forget component with no electronics to fail.
Sourcing and lifecycle
Because it is a current-production part, it is sourced through standard Siemens distribution channels and quoted to order against an RFQ.