What It Is and Where It Fits
The Siemens 3RT1034-1CP04-0KV0 is a SIRIUS power contactor in the S2 frame size, designed for switching motor loads in industrial control panels. It mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 50022, so it drops straight into a standard DIN-rail enclosure without adapter plates.
Key Ratings and What They Mean for Your BOM
At AC-2 duty (starting and stopping slip-ring motors), the contactor is rated 15 kW at 400 V — that's the figure that governs the motor load it can handle in that application. For AC-4 duty (plugging, inching, reversing), it's rated 29 A at 400 V, which is the higher thermal stress from frequent switching. The auxiliary contact block handles 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the limits for the control circuit, not the main power path.
Mounting and Integration
The contactor is 55 mm wide, 112 mm high, and 164 mm deep. It accepts screw-type terminals for the main circuit: solid or stranded wire 2x (0.75...16 mm²), and stranded alone up to 2x (0.75...25 mm²). The front face carries IP20 protection; the terminal area is IP00. Side-by-side mounting is supported, so you can gang multiple contactors on the same DIN rail without spacers.
Environmental and Compliance
The contactor operates from -25 °C to +60 °C and stores from -55 °C to +80 °C. It carries a substance prohibition date of 05/01/2012, which aligns with RoHS compliance. Pollution degree 3 means it's rated for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation.