The **W2RS-022-R** is a specific model within the **W2RS Series** of Dual-Power Automatic Transfer Switches (ATS), typically manufactured by companies like **Wenzhou Wincanton** or similar industrial relay producers. It is designed to automatically switch a load between a primary power source and a backup source (e.g., grid to generator or grid to inverter). Below is the technical breakdown of its electronic parts and specifications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Model Number** | W2RS-022-R | | **Rated Current ($I_e$)** | 22A | | **Number of Poles** | 2P (Single Phase: Live + Neutral) | | **Rated Voltage ($U_e$)** | 220V - 230V AC | | **Insulation Voltage ($U_i$)** | 690V | | **Frequency** | 50Hz / 60Hz | | **Transfer Time** | < 50ms (Millisecond level) | | **Mounting** | 35mm DIN Rail | --- ### 2. Main Electronic & Mechanical Components The device consists of several critical internal parts that facilitate the "automatic" logic and the "transfer" action: #### A. The Control Circuit (Logic Board) * **Voltage Monitoring Sensors:** These resistors and integrated circuits monitor the incoming voltage of the "Common" (Main) power source. * **Switching Logic:** If the Main source voltage drops below a threshold (usually 70-80%), the logic triggers the internal motor or coil. #### B. Driving Mechanism * **Electromagnetic Coil / Motor:** Unlike manual switches, the W2RS-022-R uses a high-speed actuator to physically flip the internal bridge contacts. * **Mechanical Interlock:** A vital safety component that prevents both the Main and Backup power sources from being connected simultaneously, which would cause a short circuit. #### C. Contact System * **Silver Alloy Contacts:** The internal switching points are typically coated in silver to provide high conductivity and resist "arcing" (sparks) during high-current transfers. * **Arc Extinguishing Chamber:** Small chutes that dissipate the heat and sparks generated when breaking an electrical circuit under load. --- ### 3. Connection Terminal Layout The unit typically features the following terminal groups: 1. **Input Terminals (Top):** * **AR / AN:** Common Power (Main) Live and Neutral. * **BR / BN:** Backup Power (Emergency) Live and Neutral. 2. **Output Terminals (Bottom):** * **Load R / Load N:** Connection to the household or equipment circuits. 3. **Signal Terminals (Small ports):** * Used for external indicator lights or to signal a generator to start/stop. --- ### 4. Operating Modes The W2RS-022-R features a toggle switch on the front face: * **Auto Mode:** The device monitors the "Common" power. If it fails, it switches to "Backup." When "Common" returns, it automatically switches back. * **Manual Mode:** The automatic logic is bypassed. The user must rotate the handle manually to select the power source. --- ### 5. Wiring Example (Simplified) ```text [Main Grid] ----> [AR / AN Terminals] \ > [Internal Bridge] > [Load R/N] / [Generator] ----> [BR / BN Terminals] ``` ---