SQM40.244A21SC Siemens Actuator

Overview

The Siemens SQM40.244A21SC is a robust, high-precision electromotoric actuator designed for the accurate positioning of air dampers and gas or oil control valves. Engineered for industrial and commercial burner applications, this actuator provides reliable rotary motion and is particularly suited for systems requiring high turndown and precise flow control. Its durable construction and NEMA 4 rating ensure dependable performance even in demanding environments, making it a critical component for maintaining combustion efficiency and safety.

Features

• High-resolution electronic actuator providing precise positioning for rotary applications
• NEMA 4 weatherproof enclosure protects internal components from harsh conditions
• Flexible mounting options allow the actuator to be installed in any orientation without additional shields
• Shaft disengagement clutch enables quick manual alignment of the actuator shaft with valves or linkages
• Internal position indication for clear monitoring of the current operating state
• Equipped with adjustable auxiliary switches for advanced control and signaling
• Built-in zero and span adjustments for fine-tuning analog control signals

Specifications

• Model: SQM40.244A21SC
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque: 90 in-lb (10 Nm)
• Run Time: 30 seconds for 90 degrees
• Rotation Direction: Counterclockwise (CCW)
• Control Signals: 4 to 20 mA, 0 to 135 ohm, or 2 to 10 Vdc
• Shaft Type: 3/8 inch Square Shaft
• Enclosure Rating: NEMA 4 (IP66 equivalent)
• Approvals: UL, CSA, CE, and EAC

Applications

• Positioning of air dampers in large commercial and industrial HVAC systems
• Load-dependent control of gas and oil flow in medium to high-capacity burners
• Driving butterfly valves and other flow control elements in thermal process plants
• Integrated use with Siemens burner controls, such as the LMV5 or LME7 series, for safety-related combustion systems
• Industrial boiler systems requiring precise modulation and reliable ignition cycles