DC Isolator PV Switch | 1500V/63A | IP66 Rated

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DC Isolator PV – Safe Disconnection for Photovoltaic Systems

DC Isolator PV – Safe Disconnection for Photovoltaic Systems

In photovoltaic (PV) installations, the DC isolator PV switch is the ultimate safeguard for maintenance personnel and equipment. At ZHNYU Electric, we engineer DC isolators specifically for solar arrays, providing reliable load-break switching under high DC voltages up to 1200V and currents up to 63A. Our isolators feature a robust arc-extinguishing design that safely interrupts DC arcs, even in fault conditions. With over 34 years of manufacturing expertise, our products are tested to 10,000 mechanical operations and 1,500 electrical cycles, ensuring longevity in harsh outdoor environments. The IP66 rating delivers full protection against dust and water jets, ideal for rooftop and ground-mounted installations. Our DC isolator PV switches comply with IEC 60947-3 and are UL listed, meeting global safety standards.
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Case Study

Utility-Scale Solar Farm in Spain Ensures Rapid Shutdown with DC Isolator PV

A 50MW solar farm in Andalusia, Spain, required robust DC isolation for each string combiner box. Prior to our solution, they experienced frequent arc faults that damaged switchgear. We supplied our DC isolator PV series, rated 1500V/63A. The compact design and high breaking capacity allowed installation in existing combiner boxes without modification. After retrofitting, the farm reported zero unplanned downtime for over 18 months. The isolator's clear ON/OFF indication simplifies manual operation during maintenance. The farm achieved full compliance with Spanish electrical safety regulations, enhancing worker safety.

Rooftop Commercial Installation in Australia Achieves Rapid Fault Isolation

A commercial building in Sydney installed a 200kW rooftop PV system. The inverter manufacturer required line-side DC isolators for safe isolation. Our DC isolator PV, with IP66 enclosure and DC-21B utilization category, was selected. The building's facility manager praised the easy-to-install design, which included cable glands for watertight sealing. During a storm, a nearby lightning strike caused an overvoltage, but our isolator broke the fault current instantly, preventing any damage to the inverter. The system remained operational after inspection. The building saved thousands in potential repair costs. This highlights the switch's ability to handle transient overcurrents while ensuring continuous operation.

Off-Grid PV System in Kenya Improves Safety and Maintenance Efficiency

An off-grid solar installer in Kenya supplied PV systems to rural health clinics. The clinics required reliable disconnection points for battery and solar array maintenance. Our DC isolator PV was integrated into the system enclosure, offering 4-pole breaking (two positive, two negative) to fully isolate both conductors. The isolator's high breaking capacity under load prevents dangerous arcing when disconnecting batteries. Over two years, the clinics have not reported any switch failures. The installer highlighted our technical support and documentation, which facilitated local training. This case illustrates our product's adaptability to emerging markets where safety and simplicity are paramount.

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At ZHNYU Electric, our journey began in 1992 with a vision to create electrical components that exceed industry expectations. Over three decades, we have grown into a global manufacturer with 10,000 square meters of office and production space and over 100 specialized machines. Our DC isolator PV line is a culmination of this experience. We understand that photovoltaic systems operate under extreme conditions – from freezing winters to scorching deserts.

Frequently Asked Questions

What is a DC isolator PV and why is it essential?

A DC isolator PV is a mechanical switch designed to safely disconnect solar panels from inverters or batteries for maintenance and emergency shutdown. It is essential because photovoltaic modules produce DC voltage continuously when exposed to sunlight. Without an isolator, technicians face a high risk of electric shock and uncontrolled arcing during servicing.
The ratings depend on your system’s open-circuit voltage (Voc) and short-circuit current (Isc). Typically, for residential systems, a 600V/32A isolator is sufficient. For commercial systems, we offer 1000V/63A and 1200V/50A versions. Always select an isolator with a voltage rating higher than your maximum Voc at low temperatures, and current rating above Isc.
Yes, our DC isolator PV switches are tested and certified in accordance with IEC 60947-3 and are CE marked. We also hold CCC certification for the Chinese market and comply with RoHS directives. This ensures that our products meet the highest safety and environmental requirements globally. We provide test certificates and declarations of conformity upon request.
Our isolators feature a rapid contact separation mechanism and a double-break design in each pole. When you operate the handle, the contacts spring apart quickly, creating an arc that is stretched and forced into arc chutes. The chutes are fabricated with arc-extinguishing plates that cool and divide the arc, causing it to extinguish faster. This design minimizes contact erosion and prevents accidental re-striking.

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Customer Testimonials

Ramesh Patel
Exceptional reliability in harsh climates

We have installed your DC isolator PV in over 1200 residential solar systems in India. The switches have performed flawlessly under extreme heat and monsoon rains. The IP66 rating is perfect, and the clear switching indication is appreciated by our installers. We have had zero warranty claims, which is remarkable.

Michael Johnson
High quality and excellent technical support

As an EPC contractor, we need components that are dependable and meet strict project deadlines. ZHNYU Electric's DC isolator PV series is our first choice for Australian commercial projects. The switch's build quality is outstanding, and the inclusion of dust covers and cable glands simplifies installation.

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Advanced Arc-Extinguishing Technology

Advanced Arc-Extinguishing Technology

The core safety of any PV isolator lies in its ability to interrupt DC arcs, which persist without natural zero-crossings. Our DC isolator PV employs a double-break contact system combined with precision-machined metal arc chambers. This design rapidly elongates the arc and dissipates heat, ensuring interruption even at 1500V DC. We have conducted over 10,000 successive operations under full load to verify contact durability. Each switch is factory-tested at 1.25 times rated current for insulation integrity. In a real-world scenario, a lightning strike in a solar farm in Texas caused a surge that momentarily welded fuse contacts, but our isolator successfully interrupted the fault without arc flash. This technology significantly lowers maintenance costs and protects valuable inverters and modules from damage.
All-Weather Robust Enclosure (IP66)

All-Weather Robust Enclosure (IP66)

Photovoltaic installations are often exposed to harsh weather: salt spray in coastal areas, sand in deserts, and snow loads. To address these challenges, our DC isolator PV is housed in a glass-fiber-reinforced polycarbonate enclosure with an IP66 rating. This means total dust protection and resistance to strong water jets, making it suitable for rooftop, facade, and ground mounts. The enclosure is UV-stabilized, preventing cracking and discoloration from prolonged sunlight. In a test conducted by TÜV, the enclosure withstood 2,000 hours of salt spray and over 3,000 kJ/m² of UV exposure without significant degradation. Additionally, the operating handle is ergonomically designed for use with gloved hands, with a padlockable feature for secure lock-out/tag-out during maintenance.
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ZHNYU ELECTRIC provides certified low-voltage electrical components—including isolating switches, MCCBs, ACBs, ATS, and DC fuses—for power, industrial, and photovoltaic applications. ISO9001, CE, CCC, RoHS compliant. Serving 60+ countries. Partner with us today.ZHNYU ELECTRIC, founded in 1992, is a professional manufacturer integrating R&D, production and sales of low-voltage electrical components and accessories.

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