The Siemens SIRIUS 3RT2018-1AP01-ZW97 is a Size S00 power contactor with a 24 V DC coil, screw-type terminals, and an integrated auxiliary switch. It's designed for screw and snap-on mounting onto a 35 mm standard mounting rail per DIN EN 60715, making it a direct fit for standard control panels.
What the ratings mean for fit
The Size S00 frame (45 mm wide, 58 mm tall, 73 mm deep) is the smallest SIRIUS contactor footprint — it packs into tight DIN-rail layouts where panel space is at a premium. The 24 V DC coil is standard for PLC-driven control circuits; at 24 V rated value the auxiliary switch handles 10 A, enough for pilot duty on most small motor starters. Wire range accepts 0.5 to 4 mm² solid or stranded, and up to 2x 4 mm² in the same terminal — common for control wiring in North American and European panels. The screw-type coil terminals are field-proven; no special tooling needed. Switching frequency varies by duty: 1 000 cycles/hour at AC-1 (resistive), 750 at AC-2 and AC-3 (motor starting/running), and 250 at AC-4 (plugging/inching). For a conveyor or pump running AC-3 duty, that's 750 operations per hour — match this to your cycle rate before committing the BOM line. Mechanical life is typical 30 000 000 operations — the contactor will outlast most panel rebuilds. Operating temperature range is -25 to +60 °C, storage -55 to +80 °C, so it's fine for unheated plant floors in temperate climates.
Mounting and clearance
Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5°. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side — tight enough for dense panel layouts but check against adjacent heat-generating devices.