Siemens Potentiometer ASZ12.803

This Siemens spare part is a potentiometer used in burner and boiler control systems. It is designed for precise position control of actuators and feedback signal transmission in heating, ventilation, and air conditioning systems. This part functions as a feedback or setpoint device in modulation circuits, providing a variable resistance signal proportional to actuator position. It is intended for use with Siemens actuators and control devices to monitor the position of dampers, valves, and similar actuating elements.

Parts of this type are selected by total resistance value and mechanical configuration: shaft diameter, length, mounting style, and rotation angle. Electro-mechanical compatibility with the actuator or control board must be verified by consulting the relevant system documentation. Before installation, de-energise the circuit and note the wiring: potentiometers typically have three terminals (start, wiper, end). The replacement must be mechanically identical in mounting and travel to avoid binding or incorrect feedback.