The 3RT2018-2XB42-0LA2: That DC coil means no hum, no AC ripple dropout — it holds in cleanly on a 24 VDC control bus, and the 24-34 V rated range gives you margin if the bus sags under load. For motor loads, it's rated 2 hp at 230 V. The inrush current peak is 2.3 A, and the mechanical life is 30,000,000 operations typical — that's a lot of cycles before the armature wears. It includes an auxiliary switch, which saves a separate auxiliary contact block for basic signaling or interlocking. The arcing time is 10-15 ms, and the DC operating time is 25-45 ms — fast enough for most control sequences but not so fast it causes nuisance trips from inrush.
DIN rail snap-on and clearance — panel integration checklist
The contactor is 45 mm wide, 73 mm deep, and 70 mm high — that's a standard S00 footprint, so it fits existing S00 panel layouts without re-drilling. That's tight enough to pack contactors side-by-side on the rail if you're not running full-rated current continuously, but give the 10 mm vertical breathing room for heat rise from the coil and main contacts. The spring-type terminals on the coil side are tool-less for solid wire — strip, push, done. The main contact terminals are screw-type, so keep a PZ2 bit handy.
Lifecycle and sourcing — active production, quoted to order
Sourcing posture: quoted to order against the BOM quantity. No minimum order quantity beyond the standard Siemens MOQ; volume pricing breaks at typical panel-builder quantities. The 30,000,000 mechanical cycle rating means this contactor will outlast most panels it's installed in — spares planning is straightforward.