The **W2PV-C1B2-R** is a specific part number belonging to a series of **Photovoltaic (PV) DC Isolator Switches**, commonly manufactured by brands like **Wenzhou Arisun** or distributed by solar component specialists. These components are critical safety devices used in solar energy systems to manually disconnect the DC current flowing from the solar panels to the inverter. ### 1. Technical Specifications Below are the typical technical parameters associated with this part number: | Parameter | Specification | | :--- | :--- | | **Component Type** | DC Isolator Switch | | **Mounting Type** | Rail Mounting / Base Mounting | | **Number of Poles** | 4-Pole (often 2-strings or bridged for higher voltage) | | **Rated Voltage (Ue)** | Up to 1000V DC / 1200V DC | | **Rated Current (In)** | Usually 32A (varies by wiring configuration) | | **Protection Degree** | IP20 (Internal) / IP66 (if in enclosure) | | **Standard Compliance** | IEC 60947-3 | --- ### 2. Key Electronic Features #### A. Arc Suppression Mechanisms Because DC current does not have a "zero-crossing" point (unlike AC), it is much harder to extinguish an arc when the switch is opened. The W2PV-C1B2-R utilizes: * **Magnetic Blowouts:** Small magnets that pull the arc away from the contacts to extinguish it quickly. * **Arc Chutes:** Specialized chambers that split and cool the arc. #### B. Contact Material and Speed * **Silver-Plated Contacts:** Used to minimize electrical resistance and prevent oxidation over long periods of operation. * **Independent Manual Operation:** The internal spring mechanism ensures that the speed of the contact separation is independent of how fast the user turns the handle. This prevents "teasing" the switch, which causes arcing. #### C. Polarized vs. Non-Polarized This specific model is typically **non-polarized**, meaning the DC wiring can be bidirectional. This reduces the risk of fire or damage if the technician accidentally reverses the positive and negative strings during installation. --- ### 3. Application Use-Case The W2PV-C1B2-R is installed between the **Solar PV Array** and the **String Inverter**. Its primary functions are: 1. **System Maintenance:** Allowing technicians to safely work on the inverter without risk of high-voltage DC shock. 2. **Emergency Disconnect:** Providing a manual point to cut power in the event of a system fault or fire. --- ### 4. Wiring Configuration Example | Poles Used | Configuration | Max Voltage | Max Current | | :--- | :--- | :--- | :--- | | 2 Poles | Single String | 600V | 32A | | 4 Poles | Series Connection | 1200V | 32A | | 4 Poles | Parallel Connection | 600V | 58A |