Siemens 3TX4422-2A Contactor

Siemens 3TX4422-2A is an auxiliary contact block with screw terminals that front-mounts to compatible SIRIUS contactors and motor relays for expanded control circuits. It provides a 2 NO / 2 NC configuration, offering two normally open and two normally closed auxiliary contacts with instantaneous switching, suitable for signaling, interlocking, and feedback paths in industrial motor control. The block is rated for an insulation voltage of 690 V and a surge withstand of 6 kV, with front IP20 protection and an operating ambient range of -25 to +55 °C (storage -55 to +80 °C). Its auxiliary circuit current handling is up to 10 A at AC-12, across both 24 V and 230 V control voltages, making it compatible with common control architectures while maintaining robust contact performance. Designed to EN 50005 specifications (identification number 22), the 3TX4422-2A integrates seamlessly with Siemens’ SIRIUS 3TX family, enhancing circuit awareness and reliability in applications such as conveyor drives, pump duty, and other industrial automation tasks where additional interlocks or signaling contacts are required. With a mechanical life of around 10,000,000 switching cycles, this auxiliary block is built for long service in demanding environments without compromising signal integrity or response time.