Controller A3RW 4.0/1/S/IP 21 17886-9989

Fan speed controller – reliable control in your ventilation system

This three-phase speed controller A3RW 4.0/1/S/IP 21 is a key component in ventilation and heating systems, designed for precise control of fan motor operation. The device allows for five-stage speed control, adjusting performance to current needs. Solid construction and a high degree of protection IP21 guarantee reliable operation even in harsh industrial conditions.

Functionality and application

The A3RW controller utilizes the principle of an autotransformer, which translates into efficient and stable control of the rotational speed of three-phase motors. It is designed to work with motors with a voltage of 3x400V (50/60Hz). Thanks to its design, this controller finds application in:

• Industrial ventilation systems – precise adjustment of airflow to demand.
• Heating installations – control of fan performance cooperating with heaters.
• Commercial and public buildings – ensuring comfort and optimizing energy consumption.
• Applications requiring speed control of three-phase motors.

Safety and durability

A3RW is equipped with a number of protections that protect both the device and the connected circuits:

• Fuse – protection against overload and short circuit.
• Anti-freeze protection – prevents damage to the motor at low temperatures.
• Thermal protection – protects against overheating of the device.
• Protection class IP21 – provides protection against access to live parts and against the effects of water ingress.

Additionally, the controller has illumination in the ON position which facilitates its operation and control of the operating status. A changeover contact allows integration with external control systems. Let's remember that smooth power control is not available in this model - it offers five predefined adjustment levels. Width 315 mm, height 185 mm and depth 300 mm allow for easy mounting in various installation configurations.