The Siemens 3RU2116-4AB0 is a SIRIUS thermal overload relay in the S00 frame size, designed for contactor mounting. It provides CLASS 10 trip protection, meaning it will trip within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts.
Auxiliary contact ratings
The integrated auxiliary switch is rated across multiple control voltages: 2 A at 24 V and 230 V, 3 A at 120 V, 1 A at 400 V, and 0.75 A at 690 V. These cover most PLC and relay interface voltages used in panel designs — the 120 V 3 A rating is the highest current point, useful for driving contactor coils directly.
Mounting and wiring
Mounts directly onto the contactor via the fastening method specified — no DIN rail required, which saves panel width. Main circuit connections use screw-type terminals accepting 2× (0.5…1.5 mm²) or 2× (0.75…2.5 mm²) solid or stranded wire. The screwdriver tip is Pozidriv PZ2 with a shaft diameter of 5…6 mm. Dimensions: 45 mm wide, 76 mm high, 70 mm deep.
Environmental and compliance
Operating temperature range is -40…+70 °C with temperature compensation active from -40…+60 °C, so the relay maintains accurate trip characteristics across typical industrial ambient conditions. Storage and transport range is -55…+80 °C. The part is RoHS-compliant per the substance prohibition date of 10/01/2009.