ZJ Beny BYH Series Non-polarity DC Isolator Switch, 1000V, 32A

The ZJ Beny isolator BYH-32 is a non-polarity DC isolator switch designed for solar PV systems, rated at 1000V DC and 32A. 

It provides a dedicated solar isolator switch on the DC side of rooftop or ground-mounted PV arrays, allowing safe disconnection between the PV panels and inverter. Its true non-polarity design means there is no dedicated positive/negative terminal, simplifying wiring by allowing either polarity on any side. Notably, it was the first DC isolator certified to the latest AS/NZS 60947.3:2018 DC-PV2 standard in Australia, ensuring it meets strict local solar safety regulations. 

Compatible with most string inverters, this isolator provides a reliable shutdown point that aligns with international PV requirements.

In operation, the ZJ Beny isolator BYH-32 sits between the solar array and the inverter (or other DC loads), allowing technicians to safely isolate the PV array during installation and maintenance. Its long arcing chamber with patented extinguishing technology quickly quenches arcs when switching off under load, enhancing safety and longevity. An integrated breather valve vents moisture to prevent condensation inside the enclosure, maintaining reliable insulation over years of use.

Overall, this solar DC isolator switch offers a compact, robust solution for inverter-side disconnects in both residential and commercial PV systems. For full technical details, refer to the ZJ Beny BYH-32 datasheet or installation guide (download available from the manufacturer)

ZJ Beny isolator ZJ-BYH-32

• True non-polarity design: 4-pole switch has no dedicated +/– terminals, allowing either polarity on any pole. This simplifies wiring and reduces installation errors.
• Advanced arc-extinguishing chamber: A patented internal design rapidly quenches arcs in under 3 ms for safe switching of PV strings.
• Integrated breather valve: Built-in breather prevents moisture buildup inside the enclosure, preserving insulation integrity.
• IP66-rated enclosure: Durable UV-resistant polycarbonate housing (with weatherproof isolator cover) protects against dust, rain and sun. Suitable for outdoor rooftop or ground-mount installations.
• 1000V DC, 32A rating: Engineered for inverter-side isolation in solar arrays, with UL/DC-PV2 ratings to handle up to 1000V open-circuit voltage at 32A load.
• Inverter-side installation: Designed to be mounted between the PV array and inverter (or DC load), as required for safe PV system design.

Key Features of ZJ Beny isolator ZJ-BYH-32

• High-performance arc suppression: Patented extinguishing chamber clears DC arcs in <3 ms for extra safety.
• Waterproof polycarbonate enclosure: IP66-rated cover protects the switch from water and dust ingress, even in harsh weather.
• Long service life: Robust construction rated for thousands of on/off cycles (mechanical life ~20,000 operations) to ensure durability.
• Compact design: Space-saving footprint with multiple entry knockouts (rear and side) for conduit or cable gland access (see datasheet for conduit options).
• Lockable handle: Clearly labeled ON/OFF switch can be padlocked in the OFF position to meet safe work requirements.

Main Benefits

For Engineers: Ensures regulatory compliance with the latest DC-PV2 standard and provides detailed specifications in the ZJ Beny DC isolator datasheet. Non-polarity wiring and clear labeling simplify system design and reduce spec confusion. The inclusion of an installation guide helps integrate the isolator seamlessly into PV designs.

For Contractors: Saves installation time with its true non-polarity design (no positive/negative orientation to check). The rugged IP66 enclosure and high-quality components mean fewer call-backs for faults. Features like the breather valve and lockable handle deliver hassle-free maintenance and safety on every job.

For Homeowners: Provides a reliable solar isolator switch that protects the PV system for years. The durable casing make it safer for maintenance or emergency shutoffs. Its clear ON/OFF operation and padlock capability give peace of mind during rooftop servicing. Positive ZJ Beny isolator reviews often highlight the unit’s build quality and longevity.

Operation Life

The ZJ Beny BYH-32 DC isolator is engineered for long-term reliability, making it a standout choice for solar PV installations that demand both safety and endurance. Its mechanical life is rated at 20,000 switching operations, which means it can be manually turned ON and OFF up to 20,000 times without mechanical failure. This exceptional durability ensures smooth performance even in frequently accessed systems or sites requiring regular maintenance isolation.

In addition to mechanical performance, the electrical life is rated for 2,000 load-bearing switching cycles, confirming the switch’s robustness under real electrical load conditions. This is especially critical in solar PV arrays, where high-voltage DC arcs can degrade inferior switches quickly. ZJ Beny’s patented arc-extinguishing design allows the BYH-32 to safely break DC currents under load, protecting both the switch and connected equipment from arc damage.

By delivering 10 times the electrical cycle rating commonly found in low-grade alternatives, the BYH-32 supports long service life across a wide range of residential and commercial PV projects. Whether used as a primary inverter-side isolator or integrated into a combiner box, its operation lifespan translates into lower maintenance, fewer replacements, and better return on investment over the system’s lifecycle.

Environmental Ratings

Solar installations in Australia face some of the harshest weather conditions—from intense UV radiation and heavy rain to high dust exposure and temperature swings. The ZJ Beny BYH-32 is specifically designed to withstand these extremes with industry-leading environmental protections.

Its enclosure is IP66-rated, offering total protection against dust ingress and high-pressure water jets from any direction. This makes it suitable for outdoor rooftop, wall-mounted, or ground-level installations, even in areas exposed to wind-driven rain or dust storms.

The housing is made from UV-stabilised, flame-retardant polycarbonate, ensuring long-term durability under direct sunlight while also resisting deformation or damage due to temperature variations. The material is also fire-resistant, adding another layer of safety when installed in high-risk areas or on residential rooftops.

The BYH-32 is further rated for a wide operating temperature range of -40°C to +85°C, making it suitable for both cold alpine regions and extremely hot summer environments typical in Australia. Whether you’re installing in the Northern Territory, Western NSW, or coastal Queensland, this isolator maintains full functionality and safety.

Together, these environmental features make the BYH-32 not only compliant with Australian standards but ideally suited for the long-term protection of solar PV systems in the country’s diverse climates. Its rugged build ensures that your DC isolator remains reliable, safe, and maintenance-free—rain or shine.

Caveat: The product description and datasheet on this page may not be the most updated version. Please refer to the user manual coming with products if there are conflicts.

ZJ Beny

ZJ Beny (Zhejiang Benyi) is a leading manufacturer of solar PV safety equipment, specializing in DC isolators and combiners. The company is well-regarded in Australia; in fact, ZJ Beny “is the most widely and popular brand in Australian solar PV installations”. 

Their products carry global approvals (SAA, TUV, CB) and meet stringent IEC/AS standards. ZJ Beny supports installers with comprehensive datasheets and installation guides, so engineers and contractors can easily find the ZJBeny DC isolator datasheet and follow best-practice wiring instructions. Solar Rains is an authorized Australian supplier of ZJ Beny isolators, offering local availability and technical support for this trusted brand.