What the Ratings Mean for Fit
The 3RT2018-1FB47 is a SIRIUS power contactor in size S00, meaning it fits the smallest frame in the SIRIUS contactor family — 45 mm wide, 58 mm tall, 117 mm deep — designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. The 24 V DC coil draws its rated current at the listed pickup and dropout thresholds; the arcing time runs 10 to 15 ms, and the DC switching time (including bounce) is 38 to 65 ms. That timing matters when coordinating with a PLC output or a safety relay — the contactor won't drop out faster than that window, so your safety circuit's off-delay must account for it. The main contact rating at 24 V DC is 6 A, which is the limiting case for DC switching — arc extinction in DC is harder than AC, so this number governs the resistive load you can switch. At 230 V AC the contactor is rated for 2 hp motor load; at 400 V AC it handles 3 A in AC-3 duty (motor starting). The mechanical life is 30 million operations typical, and the electrical endurance varies by duty: 1,000,000 operations at AC-1 (resistive), 750,000 at AC-3 (motor running), and 250,000 at AC-4 (plugging/inching). If your application cycles the contactor hard under motor load, the AC-4 figure is the one to design to.
Panel Integration and Wiring
Mounting is straightforward: screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The mounting position allows ±180° rotation on a vertical surface, plus ±22.5° tilt forward/backward — useful when the rail is in a tight enclosure corner. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. The screw-type terminals accept solid or stranded wire from 0.5 to 4 mm², and can take two conductors per clamp (2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm²). That dual-conductor capability is handy for daisy-chaining the control supply without a separate terminal block.
Lifecycle and Sourcing Reality
The lifecycle stage is listed as current — meaning Siemens still actively produces this order code. No phase-out or last-time-buy notice is on record. For a BOM freeze or a line-down spare, this is the part to specify; it is sourced to order against an RFQ through independent distribution, with availability and current pricing confirmed at quote time.