SIRIUS S2 power contactor — 22 kW AC-2 at 400 V
The Siemens 3RT1036-1AP64 is a SIRIUS-brand power contactor in frame size S2, rated for 22 kW in AC-2 duty at 400 V — the motor-switching figure that governs fit for slip-ring or wound-rotor motor loads. At 500 V it carries 30 kW, and at 690 V it delivers 11.4 kW, so the same unit spans 400 V to 690 V three-phase networks without a frame jump. The main power circuit uses screw-type terminals, accepting stranded conductors up to 2x 25 mm² and solid conductors up to 2x 4 mm². That covers most motor-feed cables through 6 AWG without needing lug adapters. Mounts on 35 mm DIN rail per EN 50022, with a 55 mm width that leaves room for adjacent devices in a crowded panel. Side-by-side mounting is permitted, so no derating gap is required between contactors on the same rail.
Duty-cycle and switching-life profile
AC-3 (cage-rotor motor) switching is rated at 800 operations per hour maximum, while AC-4 (plugging/inching) is limited to 300 per hour. The mechanical life is 10 million operations typical, so the contactor outlasts most motor replacements in conveyor or pump duty. Auxiliary contact ratings cover control-circuit voltages from 24 VDC (10 A) through 230 VAC (6 A) and 400 VAC (3 A), matching common PLC and relay interface levels. Coil operating range is 0.8 to 1.1 times rated voltage at both 50 Hz and 60 Hz.
Environmental and installation limits
Operating temperature spans -25 °C to +60 °C, with storage from -55 °C to +80 °C — fine for unheated enclosures in temperate climates. Pollution degree 3 means it tolerates conductive dust and humidity typical of industrial control rooms. The front face carries IP20 protection (finger-safe), while the terminal area is rated IP00 — install inside a cabinet with a door or cover to maintain overall panel ingress rating.