Overview
The Siemens SQN30.401A2700 is an electromotoric actuator designed for driving gas and air dampers in oil and gas burner control systems of small to medium capacity. This CE-approved actuator delivers reliable load-dependent fuel and combustion air volume control when used with P-PI or PID controllers, burner controls (LOA, LMO, LMG, LFL series), or 1- and 2-wire control systems. The unit combines robust construction with precise positioning for critical burner management applications.
Key Features
- Impact-proof and heat-resistant plastic housing for durability in high-temperature environments
- Screw terminals for secure electrical connections and easy field wiring
- Maintenance-free gear train with internal disengagement capability
- Internal and external position indication for commissioning and diagnostics
- Three easy-to-adjust auxiliary switches with transparent cam scales for precise switching point configuration
- CE approved for European market deployment
Technical Specifications
The SQN30.401A2700 offers 90-degree stroke rotation in 30 seconds at 50 Hz nominal frequency, with a maximum continuous operating torque of 3 Nm. The holding torque matches operating torque at 3 Nm, ensuring secure damper positioning under load. Three independently adjustable auxiliary switches provide relay switching functions for load control or system feedback integration. The unit accommodates screw terminal connections and includes Pg9 and Pg11 cable entry glands for flexible installation.
Typical Applications
- Oil and gas burner air/fuel damper control in heating boilers and furnaces
- Load-dependent combustion air volume regulation systems
- Fuel flow modulation in small to medium-capacity burner installations
- Integration with Siemens burner control modules (LOA, LMO, LMG, LGB, LFL series)
- HVAC and building automation damper control applications
Compatibility & Replacements
The SQN30.401A2700 is designed as a direct replacement for existing SQN30 series installations. Compatible control systems include Siemens burner controls and PLC-based P-PI/PID loop controllers. Users upgrading from older actuator models should verify damper mechanical compatibility and switch function requirements before installation. Related models in the series include the SQN30.401A2730 (with 2 switches) and SQN31.401A2700 (clockwise rotation variant). Consult system documentation or contact technical support for specific application fit verification.
