What It Is and What It Does
The Siemens SIRIUS 3RT1036-1CP04-0KV0 is a power contactor from the SIRIUS family, in the S2 frame size, designed for switching motor loads and resistive loads in industrial control panels. It is rated for 22 kW at 400 V in AC-2 duty (slip-ring motor starting) and 41 A at 400 V in AC-4 duty (plugging/inching), which defines its capability for demanding motor applications with high electrical wear.
Key Ratings and What They Mean for Your Panel
The AC-2 rating of 22 kW at 400 V tells you this contactor is sized for slip-ring motor loads up to that power — common in crane and hoist drives where controlled starting is required. The AC-4 rating of 41 A at 400 V is the more demanding duty class for reversing or inching service; if your application cycles through plugging, this is the number that governs contactor life. The 690 V rating of 11.4 kW confirms it can handle higher-voltage distribution systems, though at reduced power. Auxiliary contact ratings cover 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for pilot duty on small relays or PLC inputs, but not for main power. The switching frequency limits of 800 cycles/hour in AC-3 and 300 cycles/hour in AC-4 set the thermal ceiling for repetitive switching; exceed these and the contactor rises above its rated temperature. The contactor is rated for pollution degree 3, meaning it's suitable for industrial environments where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation can occur. The IP20 rating on the front protects against finger contact; the IP00 terminal area means the connection points are exposed and require enclosure protection in the panel.
Mounting and Termination
Mounting is via screw and snap-on onto a 35 mm DIN rail per DIN EN 50022, with a 55 mm width footprint — fits standard enclosure rail spacing. Side-by-side mounting is permitted, which lets you pack multiple contactors without dead space, but derating for thermal accumulation should be verified per the manufacturer's guidelines. Main circuit terminals are screw-type, accepting solid conductors up to 2x 4 mm² or stranded up to 2x 25 mm². The auxiliary terminals accept 2x 0.5 to 1.5 mm² solid or 2x 0.75 to 2.5 mm² stranded. This covers common panel wire sizes from 18 AWG to 4 AWG, but verify lug compatibility for larger stranded conductors.
Environmental and Mechanical Endurance
Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C, which covers most indoor industrial environments but not extended high-heat zones near furnaces. Mechanical endurance is rated at 10,000,000 cycles typical — this is the no-load life; actual electrical life depends on the duty class and switching frequency. Shock resistance is 15 g for 5 ms and 8 g for 10 ms under AC operation, with DC operating time of 20 to 25 ms and arcing time of 10 to 15 ms. These figures matter for applications near heavy machinery or conveyors where vibration could cause contact bounce.
Lifecycle and Sourcing
Compliance documentation includes RoHS substance prohibition dated May 1, 2012, covering the initial EU RoHS directive. REACH, UL, and IEC certifications are standard for the SIRIUS family, though specific cert numbers should be verified against the nameplate or manufacturer's declaration.