SQM40.261A11SC Siemens Actuator

Overview

The Siemens SQM40.261A11SC is a high-performance electromotoric actuator designed for the precise positioning of air and gas dampers, butterfly valves, and oil pressure controllers. This synchronous motor-driven actuator is engineered for industrial and commercial burner applications, providing reliable load-dependent control of combustion air, gas, and oil flow. It features a rugged design with a die-cast aluminum lower housing and an impact-resistant plastic cover, making it suitable for demanding environments like thermal process plants.

Features

• Counter-clockwise (CCW) direction of rotation
• Synchronous motor for consistent and stall-proof operation
• Manual gear disengagement via a coupling pin for easy alignment and installation
• Adjustable internal cams with scales for precise switching point settings
• NEMA 4 rated weatherproof enclosure for protection against harsh conditions
• Integrated internal position indication for real-time monitoring
• Maintenance-free gear train with non-reactive movement

Specifications

• Model: SQM40.261A11SC
• Operating Voltage: AC 110 V (50/60 Hz)
• Torque: 90 in-lb (10 Nm)
• Running Time: 25 seconds for 90 degrees at 60 Hz (30 seconds at 50 Hz)
• Control Type: 3-position (Line 3P-Step)
• Drive Shaft: 10mm Keyed Shaft
• Auxiliary Switches: Up to 6 adjustable internal switches
• Approvals: CE, UL, and CSA certified

Applications

• Supervision and control of gas and oil burners of medium to high capacity
• Positioning of flow control valves and butterfly valves in thermal plants
• Regulation of combustion air dampers in HVAC and industrial boiler systems
• Load-dependent control in connection with modulating controllers or burner controls