SIRIUS Size S2 power contactor — 30 kW at 500 V AC-3
The Siemens 3RT1036-1BE44 is a SIRIUS-brand power contactor in the Size S2 frame, rated for 30 kW at 500 V in AC-3 duty — the standard motor-switching category for squirrel-cage induction motors. That 30 kW figure at 500 V is the headline rating that governs motor sizing: it tells you the contactor can handle a 30 kW 500 V motor under normal starting and running conditions, with a maximum switching rate of 800 operations per hour in AC-3 use. For heavier-duty applications like slip-ring motors or plugging/inching duty, the AC-4 rating is 41 A at 400 V — a useful figure for drives that reverse or brake frequently, where the contactor breaks full-load current at each transition. The contactor also carries an AC-2 rating of 22 kW at 400 V, covering wound-rotor motor starting where the rotor circuit is switched.
Mounting and wiring — DIN rail, screw terminals, fill factor
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022 — the universal DIN-rail standard found in every industrial panel. Side-by-side mounting is permitted, so you can gang multiple contactors without spacing gaps, saving rail space. The main current circuit uses screw-type terminals. Solid wire capacity: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire: 2x (0.75 to 25 mm²). Dimensions: 55 mm wide, 112 mm high, 179 mm deep.
Lifecycle and compliance — current production, RoHS dated
RoHS compliance is dated 05/01/2012, covering the EU RoHS substance prohibitions. The degree of pollution rating is 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation), which is typical for industrial control panels not in sealed clean rooms — expect the contactor to tolerate the environment inside a standard IP54 or IP55 enclosure. Operating temperature range is -25 to +60 °C, storage -55 to +80 °C. The -25 °C low end means it can sit in an unheated warehouse or outdoor enclosure in cold climates without concern; the +60 °C operating limit covers most panel interiors near motors or drives.