The Siemens 3RU2136-4QD1 is a SIRIUS thermal overload relay in the S2 frame size, Class 10 trip class. Rated for 30 kW at 400 V and 57 A at 480 V, this relay covers the common European 400 V three-phase motor range up to 30 kW and the North American 480 V range at 57 A. At 690 V it handles 55 kW, so the same part works on 690 V mining or marine installations without stepping up a frame size. The auxiliary contacts share the same housing, saving a DIN-rail slot versus a separate block.
Mounting and wiring — fits the standard S2 footprint
Mounts in any position via stand-alone installation. Main circuit terminals accept 2x (0.5 to 2.5 mm²) solid or stranded, terminated with a Pozidriv PZ2 bit at 5–6 mm shaft diameter. Depth of 117 mm, width 55 mm, height 105 mm. The tripped indicator is a red flag visible through the front window.
Environmental and compliance — RoHS, REACH, temperature range
Operates from -40 to +70 °C, with temperature compensation active from -40 to +60 °C, so the trip curve stays accurate even in an unheated enclosure in a cold warehouse. Substance prohibitance date of 10/15/2014 indicates RoHS and REACH compliance for the EU market. The relay carries the SIRIUS brand and is designed to IEC/EN 60947-4-1 standards.