Siemens 3TX4001-2A Auxiliary Contactor

The auxiliary contactor, also known as control contactor, auxiliary relay, or signal contactor, with the type number 3TX4001-2A from Siemens is an electrical auxiliary contactor for control and signaling in electrical circuits. It has the dimensions 1 x 4 x 5 cm and weighs 0.1 kg. Auxiliary contactors are used to switch control currents and provide feedback on the switching status of main circuits. They are applied in automation systems, machine controls, and building technology, where precise switching operations and status messages are required.