Schimpf Servo drive 02-25/4400

The Schimpf Servo drive 02-25/4400 is an actuator designed for automatic control of dampers and regulating units in burner equipment. It operates on a 230 V supply voltage and provides a torque of 6 Nm. The runtime is 2 seconds for a 90° rotation angle. This model is identified by SKU 02-25/4400 and OEM equivalent 71111, with additional part number 862712021.

When selecting a replacement actuator of this type, ensure that the supply voltage, torque, runtime, rotation angle, and mounting interface match the original unit. Verify the shaft or coupling pattern and whether auxiliary switches are required. Always check that the control signal compatibility (e.g., three-point, 0-10 V, or on/off) aligns with the system.

Common failures in actuators of this kind include stripped gear trains, failed end switches, or seized valve stems after prolonged inactivity. Symptoms may include the damper or valve not moving, erratic positioning, or the equipment failing to modulate correctly. Check for mechanical resistance in the driven component and inspect the actuator's internal switches and gears.