Siemens SQN70.254B20 actuator

Siemens SQN70.254B20 actuator — precise burner control, German quality reliability. The Siemens SQN70.254B20 actuator is a professional actuating device for automatic control of the air damper in burner systems. Paired with a burner controller, it automatically controls the movement of the air damper, regulating the air supply for efficient fuel combustion and combustion chamber purging. Model SQN70.254B20 is the current replacement for the previous generation SQN70.254A20 and is fully compatible in mounting and electrical parameters — replacement is performed without modifications. Where it is used: The actuator is suitable for medium and low power burners operating on gas or liquid fuel, including FBR burner devices. Widely used in heating systems of industrial and commercial facilities, boiler rooms, as well as in ventilation equipment. Technical specifications: Mains parameters: 220 V, 50/60 Hz. Torque: 1.5 Nm. Power consumption: 6 VA. Damper adjustment angle: from 0 to 90°, opening angle setting scale: 0…130°. Opening time for 90°: 4 seconds. Operating voltage: 220 V (–15% / +10%). Built-in position indication. Design advantages: The actuator operates from a synchronous electric motor equipped with stall protection. The shaft can be manually disengaged, and re-engagement occurs automatically. Adjustable cams are used to select switching points. The robust design is made in a polymer housing resistant to impacts and high temperatures. Protection of electrical parts corresponds to IP40. Key features include limit switches, easy adjustment of all types of switches, and internal position indication. Why choose this model