What the ratings mean for fit
The 3RT1036-1AP04 is a Siemens SIRIUS Size S2 power contactor rated 22 kW in AC-2 duty at 400 V — that's the motor-switching figure for slip-ring or wound-rotor motors where the contactor makes and breaks under load. The AC-4 rating of 41 A at 400 V covers plugging and inching duty, which is harder on the contacts than standard AC-3 starting. If your application cycles through reversals or jogging, the AC-4 number is the one that governs contact life, not the AC-2 kW figure. On the DC side, the contactor switches 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are resistive-load ratings. For inductive DC loads (brake coils, DC solenoids), you'll want to derate or add a flyback diode; the arcing time of 10 to 15 ms at AC gives a sense of the interruption speed, but DC arcs sustain longer and the contact gap is the same. Mounting is screw and snap-on onto 35 mm DIN rail per EN 50022, and side-by-side mounting is permitted — no derating gap required between units, which saves rail space in dense panels. The Size S2 frame (112 mm high, 55 mm wide, 164 mm deep) fits the standard S2 footprint, so it swaps into existing S2 backplates without drilling.
Terminal wiring and environmental limits
Main circuit terminals accept stranded wire up to 2x 25 mm², solid up to 2x 16 mm², and the control circuit takes solid 2x 0.5 to 4 mm². That's enough for the full rated current on 16 mm² copper at 40 °C ambient — the minimum permissible cross-section is 16 mm² at 40 °C, so don't undersize the feed. The enclosure is IP20 on the front (finger-safe) and IP00 at the terminals — the connection points are live when the panel door is open, which is standard for contactors but worth flagging for lockout/tagout procedure. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Pollution degree 3 means it's rated for conductive pollution environments (condensation, occasional light moisture) — typical for industrial control panels not in a clean room.
Lifecycle and sourcing posture
RoHS compliance date is May 1, 2012 — the part is fully RoHS-compliant and carries the standard SIRIUS declaration of conformity. No REACH SVHC or UL file number appears in this listing, but the SIRIUS series typically holds UL/CSA/CE certification; verify the specific UL file for your jurisdiction at quote.