SQM41.241A21 Siemens Actuator

Overview

The Siemens SQM41.241A21 is a high-precision electromotoric actuator designed for the modulating control of gas and air dampers, as well as oil control valves on industrial burners. Engineered for use in medium to large-capacity combustion and thermal process plants, this electronic version provides accurate positioning and reliable performance. It features a robust design with a die-cast aluminum lower housing and an impact-proof plastic cover, ensuring durability in demanding HVAC environments.

Features

• Modulating control supporting multiple signal types including 0-135 Ohm, 4-20 mA, and 2-10 VDC
• High-performance synchronous motor designed to be stall-proof for consistent operation
• Integrated single potentiometer for precise electronic position feedback and adjustment
• Manual drive shaft disengagement via a coupling pin for easy setup and maintenance
• Automatic reengagement mechanism ensures the drive returns to functional state after manual adjustment
• Durable NEMA 4 rated enclosure provides protection against harsh weather and industrial conditions
• Non-reactive gear system with adjustable cams and visible scales for easy switching point monitoring

Specifications

• Model: SQM41.241A21
• Operating Voltage: AC 230 V (50/60 Hz)
• Rated Torque: 10 Nm (approx. 90 in-lb)
• Run Time: 30 seconds for 90 degrees (at 50 Hz)
• Rotation Direction: Clockwise (CW)
• Drive Shaft: 10mm diameter with Woodruff key
• Protection Rating: IP54 (NEMA 4 equivalent)
• Operating Temperature: -20 C to +60 C
• Designed Lifetime: 250,000 start cycles (approx. 10 years)

Applications

• Load-dependent control of gas, oil, and combustion air flow in industrial burners
• Precise driving of butterfly valves and dampers in thermal process plants
• Integration into burner management systems for commercial heating and boiler applications
• Use in HVAC systems requiring accurate air flow regulation and gas pressure control
• Compatible for use with various electronic ratio controllers and burner controls