The 3RT2025-1AG20 contactor with 3-pole, NO x3, auxiliary contacts NO + NC, 110VAC, and 17A is a product made by Siemens, a multinational engineering company. It is a control or switching device with contact elements, an integrated coil, and a switching mechanism. The contactor is typically an electromechanical device that is used to control high-power circuits, such as large motors. It can use an AC or DC voltage, and typically consists of three physical contact points (three-pole NO) that allow power to be sent or stopped in a circuit. It also includes a 110VAC auxiliary contact (NO + NC) that is often used for controlling external elements. The contactor is rated at 17A and is capable of switching a range of loads, from resistive to inductive. The contactor's main contacts are made of conductive silver alloy, providing superior corrosion resistance for reliable performance.