Siemens 3RT1036-1BP40 SIRIUS power contactor — S2 frame, screw terminals, 22 kW AC-3 motor switching
It is rated for 22 kW at 400 V in AC-3 duty (standard squirrel-cage motor starting) and 41 A in AC-4 duty (plugging/reversing/inching), making it a fit for moderate-horsepower motor circuits up to approximately 30 kW at 500 V. Operating temperature range is -25 to +60 °C with storage from -55 to +80 °C, and the unit carries an IP20 front / IP00 terminal enclosure rating — suitable for installation within a protected enclosure where the terminals are not exposed to direct contact.
Motor switching and operational ratings
The AC-3 rating of 22 kW at 400 V governs the standard motor-starting application — this is the figure a panel builder or MRO planner should reference when matching the contactor to a motor nameplate. Maximum switching frequency varies by duty: 1 000 operations per hour at AC-1 (resistive), 800 at AC-3, 400 at AC-2 (slip-ring motor), and 300 at AC-4.
Main current circuit uses screw-type terminals accepting solid conductors from 2x (0.5... 1.5 mm²) up to max. 2x (0.75... 4 mm²) for the control circuit, and stranded conductors from 2x (0.75... 25 mm²) for the power circuit. The minimum permissible conductor cross-section at 40 °C is 16 mm², which should be considered when sizing the branch circuit wiring.