The Siemens 3RT1025-1AL28-0PA4 is a SIRIUS 3RT1 power contactor rated for AC-3 duty at 17 A, switching 7.5 kW at 400 V. The 230 V AC coil pulls in reliably at 50/60 Hz. Three main poles handle motor loads; the 1 NO + 1 NC auxiliary contact block is integrated on the Size S0 frame. Screw terminals suit panel wiring with ferruled or solid conductors.
Panel Integration
Size S0 snap-on mounting to 35 mm DIN rail. The screw terminals accept 0.2–2.5 mm² solid or ferruled stranded. Coil terminals are on the top face; main and auxiliary connections are clearly marked. The 1 NO + 1 NC auxiliary block is pre-wired to the contactor base — no separate assembly needed.