resideo switch relay R845A1030 with built-in transformer

The Resideo R845A1030 is a 24VAC, plug-in switching relay designed for use in heating and cooling zone control systems. It features a built-in transformer, simplifying installation by eliminating the need for an external power source.

**Technical Parameters:**

*   **Input Voltage:** 120VAC, 60Hz.

*   **Output Voltage:** 24VAC, sourced from the integrated transformer.

*   **Load Rating:** 1.5A per terminal (Terminals 1-4), 3.0A aggregate across all terminals. Suitable for operating zone dampers, valves, or other low-power auxiliary devices.

*   **Control Signal:** Operates on a 24VAC call from a thermostat or zone control panel.

*   **Terminations:** Utilizes screw terminals for secure line voltage, low-voltage control, and load connections.

*   **Enclosure:** Designed as a plug-in module with a durable plastic housing.

*   **Mounting:** Typically installed on a subbase or standard electrical junction box.

*   **Compliance:** Meets applicable UL and CSA standards.

**Product Description:**

The R845A1030 is a core component for creating independent temperature zones in forced-air HVAC systems. Its primary function is to act as a powered switch, activating end devices like motorized dampers or zone valves in response to thermostat demands. The inclusion of the built-in transformer is a key feature, providing a dedicated 24VAC power supply for the relay's internal switching circuitry and the connected zone devices. This integrated design reduces wiring complexity, minimizes potential points of failure, and offers a clean, self-contained solution.

This relay is commonly used in conjunction with Resideo zone control panels and thermostats. It provides reliable isolation and amplification of the control signal, ensuring that multiple zones can operate independently without overloading the main system controller. The plug-in design facilitates easy serviceability and replacement if necessary.