SQM40.241R11 Siemens Actuator

Overview

The Siemens SQM40.241R11 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. As a part of the SQM4 series, this modulating actuator is engineered for load-dependent control of fuel and combustion air. It features a robust NEMA 4 rated enclosure, allowing for reliable operation in various orientations and environments without the need for additional weather shielding. The SQM40.241R11 is specifically configured for counter-clockwise (CCW) rotation and is often integrated into systems requiring high resolution and repeatable performance.

Features

• Flexible Control Options: Supports multiple analog input signals including 4-20 mA, 0-135 Ohm, and 2-10 VDC for seamless integration with modulating controllers.
• Robust Construction: Housed in a NEMA 4 (IP66) weatherproof enclosure, making it suitable for demanding industrial conditions.
• High Resolution: Provides precise positioning for enhanced fuel-to-air ratio control and combustion efficiency.
• Shaft Versatility: Features a 10mm Woodruff key drive shaft for secure linkage and torque transmission.
• Safety and Feedback: Includes a 1000 Ohm feedback potentiometer and adjustable internal limit and auxiliary switches for position monitoring.
• Manual Override: Equipped with a drive shaft disengagement clutch to allow for quick manual alignment during installation or maintenance.

Specifications

• Model: SQM40.241R11
• Operating Voltage: AC 120V (50/60 Hz)
• Rated Torque: 90 in-lb (10 Nm)
• Running Time: 25 seconds for 90 degrees (at 60 Hz)
• Rotation Direction: Counter-clockwise (CCW)
• Nominal Rotation Angle: 90 degrees
• Control Signals: 4-20 mA, 0-135 Ohm, 2-10 VDC
• Feedback: Single 1000 Ohm, 90-degree potentiometer
• Shaft Type: 10mm diameter with Woodruff key
• Protection Rating: NEMA 4 / IP66
• Approvals: UL-listed, CSA, and CE approved

Applications

• Industrial and commercial gas and oil burners of medium to high capacity.
• Load-dependent control of combustion air and fuel flow (gas or oil).
• Positioning of flow control valves, butterfly valves, and dampers in thermal process plants.
• Integration with Siemens burner controls such as the LMV or LME series for automated combustion management.
• HVAC and boiler systems requiring precise modulation for high turndown and reliable ignition.