Siemens 3RT1025-1A Three-Phase Industrial Contactor

Siemens Sirius 3RT1025-1A is a three-pole motor contactor designed for AC-3 duty, offering a compact S0-size package suitable for switching induction motors up to 7.5 kW (10 HP) at 400 V with a 120 V AC control coil. The main circuit is three‑pole and terminates via screws; it can be mounted on standard 35 mm DIN rails or surface/screw-fixed for flexible installation. The unit is UL and CSA listed and supports Sirius accessories, including optional auxiliary contact blocks for signaling or interlock circuits. It features IP20 protection on the front and a broad operating temperature range of -25 to +60 C, making it suitable for demanding industrial environments. For integrated motor protection, it accepts direct mounting of overload devices such as the 3RU1126 thermal overload or the 3RB2026 solid‑state overload relay. The 3RT1025 family is offered in various coil voltages; in addition to the 120 V AC coil variant, 24 V coils (AG24) are available. Common applications include conveyors, pumps, fans, and machine tools where reliable remote switching of motors is required.