SQM40.265R11 Siemens Actuator

Overview

The Siemens SQM40.265R11 is a high-precision electromotoric actuator designed for the accurate positioning of air and gas dampers, butterfly valves, and oil pressure controllers in industrial and commercial burner applications. This counter-clockwise (CCW) rotating actuator is engineered for medium to high-capacity combustion systems and thermal process plants, providing reliable load-dependent control of fuel and air flow. As a critical component in linkageless or position-proportional control systems, it is often used in conjunction with Siemens burner controls like the LMV5 or LME series to ensure optimal combustion efficiency and safety.

Features

• High-torque performance with 90 in-lb (10 Nm) for handling heavy-duty damper and valve assemblies
• Integrated synchronous motor provides stall-proof operation and consistent timing
• Manual drive shaft disengagement via a coupling pin for easy alignment during installation
• Built-in position indication with internal scales for precise monitoring of the switching point
• Adjustable limit and auxiliary switches (6 switches total) for customizable control logic
• Robust NEMA 4 weatherproof enclosure protects internal components in harsh industrial environments
• UL and CSA approved for use in North American markets

Specifications

• Model: SQM40.265R11
• Operating Voltage: AC 120 V (+10% / -15%); 50/60 Hz
• Direction of Rotation: Counter-clockwise (CCW)
• Rated Torque: 90 in-lb (10 Nm)
• Holding Torque: 90 in-lb (10 Nm)
• Running Time: 30 seconds for 90 degrees (at 60 Hz)
• Drive Shaft: 10 mm D-type shaft
• Auxiliary Switches: 6 internal adjustable switches
• Potentiometer: Single 1000 Ohm 90-degree potentiometer
• Protection Rating: NEMA 4 (equivalent to IP66)
• Weight: Approximately 3.0 lbs (1.36 kg)

Applications

• Load-dependent control of gas, oil, and combustion air in industrial burners
• Positioning of flow control valves and butterfly valves in HVAC systems
• Control of dampers in medium to high-capacity boiler plants
• Use in thermal process plants requiring high-resolution rotary motion
• Integration with 3-position or modulating controllers for precise fuel-air ratio control