Siemens SQN70.454B20 actuator

Siemens SQN70.454B20 actuator — power and precision for burner systems. The Siemens SQN70.454B20 actuator is a reliable actuating device for automatic control of the air damper in burner equipment. It precisely regulates the volume of air entering the combustion chamber, ensuring optimal fuel-air mixture composition and high-quality purging — all of which directly affect the efficiency, safety, and service life of your equipment. Model SQN70.454B20 is the current replacement for the previous generation SQN70.454A20 and is fully compatible in mounting and electrical parameters — replacement is performed without modifications. Where it is used: The actuator is intended for low and medium power gas or oil burners. It works together with a flame safeguard, 3-position controller, or RWF40 controller. It is in demand in boiler rooms, industrial and commercial heat supply systems. Technical specifications: Power supply: 220 V (–15% / +10%), 50/60 Hz. Torque: 2.5 Nm. Protection class: IP40. Opening time for 90°: 12 seconds. Adjustment angle: 0–130°. Operating temperature range: –20 to +60°C. Built-in position indication. Design advantages: The actuator is equipped with relays, limit and auxiliary switches, and cams with graduated scales for easy adjustment. The housing made of impact-resistant heat-resistant plastic protects the device in harsh operating conditions. The drive shaft is made of wear-resistant steel. The device can be mounted in various positions and easily integrates into existing control systems. Why choose this model: Compared to model SQN70.254B20, this actuator has increased torque (2.5 vs 1.5 Nm) and half the travel time — 12 seconds vs