Siemens 3RT1036-1BP40 SIRIUS power contactor — S2 frame, screw terminals, 22 kW AC-3 motor switching
The Siemens 3RT1036-1BP40 is a SIRIUS power contactor in the S2 frame size, designed for switching motor loads in industrial control panels. 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. The contactor mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 50022, and its 55 mm width allows side-by-side mounting without derating, a practical consideration for dense panel layouts. 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. The AC-4 rating of 41 A at 400 V covers reversing or jogging duty where the contactor makes and breaks the stalled rotor current, a more demanding condition that typically derates the thermal capacity. 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. These limits reflect the thermal recovery time of the contactor between operations and should be respected in high-cycle applications like conveyor indexing or press control. Mechanical endurance is rated at 10 million operating cycles typical, which aligns with the SIRIUS platform's expected service life for controlled environments.
Termination and wiring
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. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation) is specified, which is standard for industrial control panels not in a climate-controlled environment.
Lifecycle and compliance
RoHS compliance is documented with a substance prohibition date of 05/01/2012, confirming the part meets the EU RoHS directive restrictions on hazardous substances as of that date.