Siemens 3RT1034-1BW40-ZX95 — SIRIUS S2 Power Contactor
The Siemens 3RT1034-1BW40-ZX95 is a SIRIUS-branded power contactor in the S2 frame size, designed for switching motor loads in industrial control panels. It mounts via screw and snap-on onto standard 35 mm DIN rail per DIN EN 50022, with a width of 55 mm and a depth of 130 mm, making it a compact fit for crowded enclosures. Rated for AC-3 duty at 400 V at 18.5 kW and AC-4 at 400 V at 29 A, this contactor handles induction motor starting and inching/plugging applications. For DC loads, it switches up to 10 A at 24 V, 2 A at 60 V, and 0.3 A at 220 V — figures that govern its use in battery-backed or DC bus circuits. The main current circuit uses screw-type terminals, accepting solid conductors up to 2x 4 mm² and stranded up to 2x 25 mm². The enclosure is rated IP20 on the front and IP00 at the terminal area, meaning it requires installation within a higher-rated cabinet for washdown or dusty environments.
Lifecycle & Sourcing Reality
For BOM freeze or compliance audits, the part carries a substance prohibitance date of 05/01/2012, aligning with RoHS and REACH requirements. Pollution degree 3 rating suits industrial environments with conductive pollution or occasional condensation.
Installation & Integration Notes
Side-by-side mounting is permitted, which simplifies multi-contactor motor starter assemblies on a single DIN rail segment. The S2 frame leaves clearance for auxiliary contact blocks on either side — verify the ZX95 suffix denotes any special packaging or variant marking, not a functional change. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C. The arcing time of 10 to 15 ms and DC operating time of 20 to 30 ms are relevant for timing coordination in safety circuits or sequential motor starts.
Why This Rating Set Matters for Your BOM
The AC-3 maximum switching rate of 1,000 operations per hour suits frequent start-stop cycles on conveyors or pumps, but not the high-duty inching of AC-4 (250 ops/h). The 10,000,000 mechanical cycle rating gives a long service life under normal motor switching. DC switching ratings are derated significantly from AC — the 10 A at 24 V drops to 0.3 A at 220 V due to arc extinction limits. If your BOM uses this contactor in a DC circuit above 60 V, confirm the load current is under the 2 A threshold at that voltage.