The Siemens 3RT2025-2NP30 is a SIRIUS power contactor in the S0 frame size, carrying a 200-280 VAC coil and spring-type terminals on both coil and main circuits. It mounts via screw or snap-on onto 35 mm standard DIN rail per DIN EN 60715, with a 45 mm width that fits standard panel cutouts. The contactor is rated for switching loads at up to 1,000 operating cycles per hour under AC-1, AC-2, AC-3, and AC-3e duty, with a reduced 300 cycles/hour for AC-4 (high-inrush or plugging duty). Inrush current peaks at 25 A, which the coil supply must handle without voltage sag.
Panel integration is straightforward: the 45 mm width and 102 mm height leave room for side-by-side mounting with other S0 contactors or overload relays on the same DIN rail. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward, so it fits tight enclosures without derating. Clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side for arc flash and heat dissipation. Arcing time is a tight 10 ms, which keeps arc energy contained within the contactor housing.
Wire termination uses spring-type terminals on the coil, accepting solid or stranded conductors from 1 to 10 mm², with double-wire capability at 2x (0.5 to 2.5 mm²). The main contact arrangement is 3-pole normally open (3RT series standard), with an auxiliary switch block included as standard. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. Coil pickup is rated at 0.7 x nominal voltage, dropout at 0.51 x nominal at 50 Hz (0.56 at 60 Hz). Switching times for both AC and DC coils are 30 to 50 ms.