SQM40.145R11SC Siemens Actuator

Overview

The Siemens SQM40.145R11SC is a high-precision modulating actuator designed for the positioning of flow control valves, butterfly valves, and dampers in industrial and commercial burner systems. As part of the SQM4 series, this electromotoric actuator is engineered for high-resolution performance and reliability in heavy-duty HVAC applications. It provides precise load-dependent control of gas, oil, or combustion air, supporting systems that require high turndown and consistent ignition.

Features

• Electronic modulating version with an analog control input for precise positioning
• Durable NEMA 4 weatherproof enclosure suitable for various mounting positions
• Self-starting, stall-proof synchronous motor ensures long-term operational stability
• Manual drive shaft disengagement clutch for quick alignment during installation
• Internal position indication with clearly marked adjustable limit and auxiliary switches
• Adjustable zero and span settings for fine-tuning analog control signals
• Impact-proof and heat-resistant plastic housing cover with a die-cast aluminum base

Specifications

• Model: SQM40.145R11SC
• Operating Voltage: AC 110 V (50/60 Hz)
• Torque: 45 in-lb (5 Nm)
• Running Time: 15 seconds for 90 degrees
• Rotation Direction: Counterclockwise (CCW)
• Shaft Type: 10mm D-Shaft
• Control Signal: 4-20 mA or 0-135 ohm
• Approvals: UL and CSA listed

Applications

• Load-dependent control of gas, oil, and combustion air in industrial burners
• Positioning of butterfly valves, flow control valves, and air dampers
• Thermal process plants requiring rotary motion for flow regulation
• Integration with 3-position or modulating controllers and Siemens burner controls
• Use in HVAC systems where precise, safety-critical air-gas ratio control is required