SQM40.241A21SC Siemens Actuator

Overview

The Siemens SQM40.241A21 is a high-precision, electromotoric actuator designed for the modulating control of air and gas dampers, butterfly valves, and other applications requiring rotary motion. Engineered for use in industrial and commercial burner systems, this actuator ensures optimal combustion by providing precise load-dependent control of gas, oil, and combustion air. It features a robust design with a die-cast aluminum lower housing and a NEMA 4 plastic cover, making it suitable for demanding environments without the need for additional weather shields.

Features

• Electromotoric operation with a powerful synchronous motor
• Counter-clockwise (CCW) rotation with a 90-degree angular range
• Modulating control input supports 4 to 20 mA, 0 to 135 ohm, and 2 to 10 VDC signals
• Integrated drive shaft disengagement clutch for quick manual alignment
• Internal position indication and adjustable cams for precise switching point settings
• Durable construction with a NEMA 4/IP66 rated enclosure for weather protection
• Maintenance-free gear train with automatic re-engagement

Specifications

• Model: SQM40.241A21
• Operating Voltage: AC 230 V (50/60 Hz)
• Torque: 10 Nm (approx. 90 in-lb)
• Running Time: 30 seconds for 90 degrees (at 60 Hz)
• Control Input: Analog (4-20 mA, 0-135 Ohm, 2-10 VDC)
• Drive Shaft: 10 mm keyed shaft (Woodruff key)
• Power Consumption: 10 VA
• Operating Temperature: -20 C to +60 C
• Weight: Approximately 5.0 lbs (2.27 kg)
• Approvals: CE, UL, and CSA certified

Applications

• Load-dependent control of gas, oil, and combustion air in industrial burners
• Positioning of flow control valves and butterfly valves
• HVAC air damper and gas damper modulation
• Thermal process plants requiring reliable rotary motion
• Integration with 3-position or modulating controllers and Siemens burner controls like the LMV5 or LME7 series