What This Part Is and Where It Fits
The Siemens 3RT1035-1AP80-0KR0-ZX95 is a SIRIUS 3RT1 power contactor rated for AC-3 duty at 40 A, switching 18.5 kW at 400 V across three poles. The coil pulls in on 230-240 VAC, 50/60 Hz. It's a Size S2 frame with screw terminals — the standard footprint for panel builders wiring motor starters, pump controls, and conveyor drives up to that load.
Lifecycle Reality — Phased Out
This exact order code is flagged as a phased-out product. The lifecycle stage is listed as current, meaning Siemens has formally ended production of the 3RT1 series variant. The official successor is the SIRIUS 3RT2 family. If you're replacing a failed unit on a live line, the 3RT2 is the drop-in path — same Size S2 footprint, same screw terminal layout, and the AC-3 current ratings carry over. For a BOM line that still specifies this 3RT1 code, we source it through independent surplus and last-time-buy channels against an RFQ; expect no factory support or warranty from Siemens.
What the Ratings Mean for Fit
AC-3 40 A is the motor-switching rating — it handles starting inrush (typically 6–8x FLA) and breaks the load under running conditions. The 18.5 kW at 400 V figure is the three-phase motor it can switch; if your motor is 400 V and draws less than 40 A in AC-3, this contactor has headroom. The 230-240 VAC coil means it's direct-on-line from a control transformer or PLC relay output at that voltage — no DC conversion needed, but verify the coil pickup/dropout curve if your control voltage sags. Size S2 with screw terminals means it occupies the same DIN-rail footprint as other S2 contactors (roughly 55 mm wide) and accepts standard ring or fork lugs; no special crimp tool required.