What It Is and Where It Fits
The Siemens SIRIUS 3RT2018-2BB42-1AA0-ZX95 is a size S00 power contactor with a 24 V DC coil and spring-type terminals. It's rated for 10 A at 24 V DC and 2 hp at 230 V, making it a fit for switching smaller motor loads in control panels. The S00 frame keeps the footprint tight at 45 mm wide, 70 mm tall, and 73 mm deep — that's another SKU that fits a standard DIN-rail slot without crowding the next device.
Key Ratings and What They Mean for the Buyer
The 24 V DC coil pulls in reliably; the rated switching capacity at 24 V DC is 10 A, which covers many solenoid and small DC motor circuits. For AC motor duty, the AC-3 rating (750 operations per hour maximum) is the one that governs real-world use — it's rated for switching motors up to 2 hp at 230 V. The mechanical life of 30 million operations means this contactor will outlast most of the panel it's in, assuming the load stays within the AC-3 curve. Spring-type terminals accept solid or stranded wire from 0.5 to 4 mm², and you can double up two conductors of the same range per clamp. That's a time-saver on the wireman's side — no screw torque to check, just strip to 8 mm and push in. Clearance requirements are straightforward: 10 mm upwards, forwards, and downwards, and 6 mm at the side. That keeps the contactor from cooking its neighbors in a tightly packed enclosure.
Mounting and Integration
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The preferred position is standing on a horizontal mounting surface. An auxiliary switch is built in, so you don't need a separate add-on block for basic status feedback.