Siemens Servo actuator SQM40.281A20

Name: Siemens Servo actuator SQM40.281A20
Brand: Siemens
SKU: SQM40.281A20
Price: 766.00 EUR
Availability: InStock

SKU SQM40.281A20 Brand Siemens

Brand Siemens

Key specifications

Control signal types	three-point, 0-10 V, or on/off
Equipment compatibility	full compatibility with siemens equipment

all specifications (2) ↓

633.06EUR

in stock · 1

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Description

The Siemens Servo actuator SQM40.281A20 is a high-precision final control element used in combustion control systems and industrial automation. It is designed for automatic control of air dampers, gas valves, and other regulating elements in burner units, ensuring stable and efficient operation. This actuator supports control signal types including three-point, 0-10 V, or on/off, and is fully compatible with Siemens equipment. It is suitable for use in boiler plants, gas burner systems, and industrial thermal equipment where accurate positioning is required.

Further details

Advantages	original siemens servo actuator; precise control; suitable for combustion control systems; high reliability; smooth positioning; durable construction; full compatibility
Application	position air dampers and mixing valves
Application description	automatic control of air dampers, gas valves, and other regulating elements in burner units
Failure modes	stripped gear trains, failed end switches, seized valve stem
Function	translate a control signal into rotational movement, adjusting airflow or flow ratio
Replacement checks	verify mechanical compatibility with damper or valve shaft, electrical connection and signal matching
Selection criteria general	required torque, running time, control signal type, shaft or coupling pattern, angle of rotation, auxiliary switches
Usage	boiler plants, gas burner systems, industrial thermal equipment
Variant verification	specific variant 281a20 is identified by its full manufacturer code

Choosing and fitting

When selecting an actuator of this type, verify mechanical compatibility with the damper or valve shaft, including shaft size and coupling pattern. Ensure the control signal type (three-point, 0-10 V, or on/off) matches the control unit, and check the required torque, running time, and angle of rotation. Also confirm whether auxiliary switches are needed for feedback or end-position indication.

Signs of failure

Typical failure modes include stripped gear trains, failed end switches, or a seized valve stem after prolonged standstill. Symptoms may include erratic positioning, failure to reach commanded positions, or no movement at all. Check for mechanical binding, electrical continuity, and proper signal input to diagnose issues.