The Siemens 3RT2517-2AP00-Z X95 is a size S00 power contactor from the SIRIUS family, rated for AC-3 duty at 12 A and 5.5 kW on a 400 V three-phase system. That AC-3 rating means it's built for starting and stopping squirrel-cage induction motors under load — the standard for conveyor drives, pumps, and compressors in control panels. The 4-pole configuration gives you 2 normally-open and 2 normally-closed main contacts, so you can switch both the motor supply and a separate control circuit or brake without needing an auxiliary contact block. The 230 V AC coil operates on 50/60 Hz, which is the standard industrial control voltage across Europe and much of Asia. Spring-loaded terminals — push-in or cage-clamp style — let you terminate solid or ferruled stranded wire without a screwdriver, which speeds up panel wiring and holds tight under vibration.
RoHS compliance is confirmed since October 2009, and REACH candidate-list information is available for downstream reporting. No export restrictions beyond standard AL:N / ECCN:N classification, so cross-border sourcing is straightforward. The packaging note mentions reusable packaging when ordered in the full pack quantity of 120 units — something to flag for bulk orders if your facility has return logistics for packaging.
Size S00 mounts on standard 35 mm DIN rail and measures roughly 70 x 47 x 73 mm, so it occupies about the same footprint as a four-module miniature circuit breaker. The spring-loaded terminals accept conductors up to the contactor's rated cross-section — typically 1.5 to 4 mm² for power wiring — and the compact depth leaves room for wiring ducts and auxiliary blocks on adjacent rail positions. For a 5.5 kW motor at 400 V, expect a full-load current around 11-12 A, so the 12 A AC-3 rating is right at the motor's draw. If the motor starts under heavy load or cycles frequently, consider whether the utilization category or service factor demands a contactor one frame size up — but for standard IEC general-purpose motors, this is the direct match.