The Siemens 3RT25 series is a contactor,2 NO + 2 NC,4 pole,S00,with screw type terminal for changing the polarity of hoisting gear motors or switching two separate loads .The 3RT25 contactors are part of the modular SIRIUS system with its optimally coordinated products. They offer convincing performance from a compact design with high contact reliability. They can be combined with a variety of other components in the load feeder. Many of the device combinations have been factory tested. The contactors offer the best connection to the automation level for every application (parallel, via ASi or IO-Link). They offers fast, maintenance-free and vibration-proof connection They are available in various sizes and in a wide performance range Simple, efficient and always up to date - SIRIUS modular system The front-panel terminals simplify the wiring Integrated auxiliary switches reduce the complexity of your configuration