• Replacement head for HS3 3 port valve bodies
• No need to drain down the system - disconnect wiring and unscrew from valve body
• Spring return lever for manual operation

The Danfoss HSA3 3-Port Valve Actuator is a purpose-designed mid-position actuator for 3-port heating system valves, ideal for installations where flow diversion or mixing is required. The actuator operates on 230 V AC and provides reliable open/close action of the valve body with closing times of up to 20 seconds and opening times up to 35 seconds. It features a built-in SPST auxiliary switch for indication or interlocking functions, with output ratings of 3 A resistive and 1 A inductive�enabling integration with control panels or building management systems. Its compact dimensions (approx 63 � 86 � 73 mm) and weight (~0.53 kg) make it compatible with a wide range of valve bodies and system layouts. Designed for durability, the HSA3 actuator meets WEEE and REACH requirements and is covered by a two-year manufacturer warranty. It is commonly used in both domestic and commercial central-heating applications to control valve movement, enabling correct routing of flow, mixing or diverting circuits, and efficient heating system operation. Installation is straightforward and the actuator serves as a direct replacement for compatible motorised valve heads, avoiding the need to replace the entire valve body.