Understanding Solar PV DC Isolators

Solar PV DC isolators, also known as DC disconnects or DC switch-disconnectors, play a crucial role in the safety and efficiency of photovoltaic (PV) systems. These devices are designed to isolate the direct current (DC) generated by solar panels from the rest of the electrical system, particularly during maintenance or in the event of an emergency.

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Key Functions of Solar PV DC Isolators

  1. Installation Safety: During the installation of a PV system, technicians often need to disconnect the solar panels from the inverter. By using a DC isolator, they can safely isolate the DC power, preventing electrical shocks and protecting the inverter and downstream equipment from potential damage. This ensures that the system is safe to handle when connecting or disconnecting DC terminals.
  2. Maintenance and Repair: In a solar power plant, the inverter operates continuously as long as there is sunlight, even during cloudy weather. This means the DC side remains live, posing a risk during maintenance or replacement of the inverter. A DC isolator allows for the safe disconnection of the DC power from the solar panels, ensuring that technicians can work without the risk of electric shock or damage to the equipment.
  3. Preventing Backfeed: Many modern inverters, especially transformerless (TL) series, do not have electrical isolation between the AC and DC sides. This can potentially allow AC power to backfeed into the DC side. By physically isolating both the AC and DC sides using dedicated switches, the risk of backfeed and associated hazards can be mitigated.

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Types of Solar PV DC Isolators

Solar PV DC isolators come in various types to suit different installation needs:

Features of Onccy Electrical Solar PV DC Isolators

  1. DC Specific Design: These isolators are designed specifically for DC applications, with a current rating range of 16-630A and a voltage range of up to 1500V, making them suitable for a wide range of applications.
  2. Flexible Installation: The modular design and different mounting options provide installation flexibility.
  3. Self-cleaning Contacts: The self-cleaning contact design reduces resistance and energy loss, extending the device’s lifespan.
  4. Multiple Poles: Available in 2 to 10 poles, catering to various system configurations.
  5. Fast Switching: Maximum switching time is less than 5ms, ensuring quick and reliable disconnection.
  6. High-Quality Materials: Made from UL94V-0 flame-retardant materials, suitable for harsh environments.
  7. Compliance and Certification: These isolators comply with various international standards such as IEC, UL, TUV, CE, CB, SAA, and CCC, ensuring they meet global market requirements.

Onccy Electrical’s Commitment

Onccy Electrical offers a comprehensive range of solar isolator disconnects compatible with string inverters ranging from 1KW to 320KW. Their products comply with IEC60947-3(ed.3.2):2015 standards and are UL certified, meeting the latest photovoltaic standards and addressing system safety and protection concerns globally. Onccy Electrical continues to innovate, providing diverse and superior choices to the market.


Solar PV DC isolators are essential for the safe and efficient operation of photovoltaic systems. By understanding their functions and features, installers and maintenance personnel can ensure the protection of both equipment and personnel. As the demand for renewable energy solutions grows, reliable and compliant DC isolators like those from Onccy Electrical are vital in supporting the global solar energy market.

For more information on how Solar PV DC Isolators can enhance the safety of your photovoltaic system, visit our website or contact us today. Ensure your solar energy system is both efficient and secure with Onccy Electrical’s top-of-the-line products.

Explore our range of solar PV DC isolators now and secure your photovoltaic system with the best in the industry. Contact us for more details and personalized recommendations.