40003916-526/U 24 Vac, 50/60 Hz replacement head with limit switch, suitable for V8043E 5000 series

**Technical Specifications:**

*   **Model Number:** 40003916-526/U

*   **Voltage:** 24 VAC

*   **Frequency:** 50/60 Hz

*   **Replacement For:** Designed as a direct replacement head assembly for the Honeywell V8043E 5000 series zone valves.

*   **Actuator Type:** Synchronous motor-driven actuator.

*   **Limit Switch:** Integrated auxiliary end switch (limit switch). This switch is typically used to provide a signal for external control circuits, such as activating a circulator pump upon valve opening.

*   **Connection:** Features quick-connect terminal tabs for reliable electrical connection.

*   **Housing Material:** Durable thermoplastic construction.

*   **Mounting:** Direct screw-on replacement, designed to interface seamlessly with the existing valve body of the V8043E series.

**Product Description:**

This is a 24 VAC replacement actuator head assembly, compatible with Honeywell V8043E 5000 series zone valves. The unit operates on standard 50/60 Hz power frequency and is engineered for direct, tool-free installation onto compatible valve bodies without requiring system drainage.

Its core component is a reliable synchronous motor which drives the valve mechanism between open and closed positions. A key feature is the built-in limit switch, which activates an isolated circuit to provide a confirmatory signal for ancillary equipment, most commonly used to trigger a boiler circulator pump when the valve is fully open.

This replacement head restores full functionality to compatible zone valves, offering a cost-effective solution compared to replacing the entire valve assembly. It is suitable for use in residential and light commercial hydronic heating systems for zone control.