PV Array Isolator: 1500V DC Safety Switch for Solar Systems

In a recent project, a 120 MW photovoltaic plant in the Atacama Desert, Chile, required reliable disconnecting solutions to ensure safe maintenance. The client integrated 2,500 units of our PV array isolators, each rated for 1500V DC and 40A. These isolators were installed between every string combiner box and the central inverter. During a routine inspection, a technician noticed an anomaly in one string; the isolator allowed for immediate isolation, preventing potential arc faults and saving the facility over $200,000 in potential downtime costs. The rugged design, with IP65 protection, withstood the harsh desert environment, including extreme heat and UV exposure, maintaining optimal performance even after prolonged operation. This case highlights the critical role of high-quality PV array isolators in ensuring operational safety and reducing risk in large-scale solar installations.

A residential solar installation in Munich, Germany, equipped with a 10 kW rooftop system, faced the challenge of meeting the stringent VDE-AR-E 2100-712 standard for quick disconnect. The installer selected our PV array isolator, which provides a visible break and complies with the standard’s requirements. The installation, completed in 2023, included a compact, IP66-rated isolator mounted on the racking system. Following heavy snowfall, the system experienced a grid fault; the homeowner was able to safely isolate the solar array from the inverter using the outdoor-accessible isolator, preventing any backfeed. This quick response, facilitated by the intuitive handle and clear OFF/ON indicators, minimized the homeowner's stress and avoided a costly service call.

A commercial building in Sydney, Australia, with a 350 kW rooftop solar array, needed a solution to mitigate fire risks and meet the AS/NZS 5033 requirements. Our PV array isolators, rated at 500V DC and 20A, were installed at each array point. The building’s maintenance team praised the isolators' load-break capability, which allows safe disconnection under load without arcing, a critical feature for fire safety. During a routine thermal inspection, a hot spot was detected on one of the strings; the isolator enabled immediate isolation, averting a potential fire incident. The isolator’s IP66-rated enclosure also protected against the harsh coastal environment, ensuring corrosion resistance and long-term reliability. The project manager reported that the isolators' tamper-proof design provided an extra layer of security, making unauthorized disconnection difficult.