DA400111 / Damper Act Modulating 24V, 40Nm, 0-10V, Feedback 0-10 VDC, 2 Aux Sw

DA40S Fail-safe Damper Actuator, 40Nm Series

The DA40S Damper Actuator provides high-level security for large HVAC systems. It delivers a strong 40Nm of torque to manage air dampers with ease. This series works perfectly for dampers up to 8 square meters. It keeps your ventilation safe even during a sudden power loss. You can find more fail-safe ventilation solutions in our catalog here.

Key Benefits of the DA40S Damper Actuator

This model uses a high-quality capacitor for reliable emergency power. If the main power fails, the unit moves to a safe position automatically. You can choose between “Zero” or “Full scale” settings using a simple DIP switch. This emergency mode triggers in just two seconds to protect your equipment. The internal capacitor has a long service life of over ten years. ThisDA40S Damper Actuator  also uses a Brushless DC motor (BLDC). This motor runs quietly and saves energy by using only 1.5W when holding its position.

Advanced Communication and Control

The unit offers many ways to manage your building’s airflow. It supports Modbus-RTU and RS485 for modern automation systems. It also accepts standard 0-10V and 4-20mA signals from most controllers. The internal feedback signal provides real-time data on the exact damper position. You can also use the built-in SPDT switches to trigger other system parts. To learn more about these protocols, visit the Modbus Organization website.

Installing the DA40S Damper Actuator

Setup is fast and simple for any technician. The device fits circular shafts from 12mm to 26.7mm. It also works with square shafts between 12mm and 18mm. You can set the rotation direction with a simple knob on the housing. If you need to move the damper without power, use the manual override button. Simply push the button and turn the shaft by hand. The clear mechanical indicator shows the damper position at all times.

Technical Specifications:

• Focus Keyphrase: DA40S Damper Actuator

• Torque: 40 Nm

• Running Time: 150s (Standard) or 75s (Optional)

• Fail-safe Speed: Less than 45 seconds

• Power Input: 24V AC/DC

• Communication: Modbus-RTU, RS485, 0-10V, 4-20mA

• Safety Rating: Class III low voltage safe