50kA Breaking Capacity for Solar & BESS

All Categories
EN EN
High-Performance DC Isolation with Integrated Fuse Protection for Photovoltaic and Industrial Applications

High-Performance DC Isolation with Integrated Fuse Protection for Photovoltaic and Industrial Applications

Our DC Fused Isolator combines reliable disconnection and overcurrent protection in a single compact device, engineered specifically for demanding DC applications such as photovoltaic arrays, battery storage, and DC motor control. With a rating up to 1000V DC and current ranges from 32A to 125A, this isolator ensures safe maintenance and operational efficiency. Over 34 years of manufacturing expertise, 60+ export countries, and compliance with IEC 60947-3 and UL 508i, our DC Fused Isolator delivers a breaking capacity of 50kA, ensuring robust protection for your energy infrastructure. Integrated in solar farms across Germany, this product has demonstrated a 99.9% reliability rate in over 10,000 installations, reducing downtime by 72% compared to traditional solutions. The compact IP66 enclosure withstands harsh environments, making it ideal for rooftop PV and remote industrial sites.
Get A Quote

Case Study

Solar Farm in Spain Enhances Safety and Speed

In a 50MW photovoltaic installation situated in Seville, Spain, operational technicians required a rapid DC isolation mechanism for high-voltage DC combiner boxes to prevent localized overheating. Previous non-fused isolators resulted in slow fault isolation and increased operational risks during string short circuits. ZHNYU Electric provided 800 custom units of 1000V/63A DC Fused Isolators equipped with specialized gPV fuse linkages. The integrated arc-chute geometry and gPV fusing mechanism cut peak fault clearing times to under 10ms, eliminating thermal runaway risks in high-ambient solar environments. The ergonomic terminal layout accelerated field wiring speeds by 45%. The facility recorded a 30% reduction in annual maintenance downtime, saving approximately €120k in operational expenditure. Lead electrical engineer Carlos Mendez confirmed that clear visual break indicators and external fuse access significantly streamlined daily safety protocols.

Battery Storage Facility in Australia Avoids Downtime

A 20MWh utility-scale battery energy storage system (BESS) in Queensland, Australia, required heavy-duty DC isolation capable of breaking high short-circuit currents during rapid load switches. ZHNYU Electric deployed heavy-duty DC Fused Isolators rated for 50kA breaking capacity across every battery rack module. During an unannounced high-current fault simulation, the unit executed full contact separation within 1ms, allowing the gPV fuse to safely clear the overload without contact welding or enclosure deformation. This instantaneous response protected the surrounding lithium-ion battery banks from cascading thermal damage, preventing an estimated $500k in equipment losses. The maintenance team reported that front-access fuse replacement reduced system outage durations by 60%, establishing a dependable safety standard for large-scale energy storage deployments across Oceania.

Mining Operation in Chile Enhances Operator Safety

A large-scale copper extraction facility in Chile required reliable DC load isolation for high-torque conveyor drive motors operating under heavy particulate contamination and extreme humidity. ZHNYU Electric supplied IP66-rated 125A DC Fused Isolators to manage 750V DC drive circuits. The reinforced polycarbonate enclosure prevented dust and moisture ingress, while silver-alloy contacts maintained ultra-low contact resistance despite continuous heavy vibration and minor line voltage fluctuations. Safety director Luis Fernandez noted that the positive-break contact visualization allowed field technicians to perform lockout/tagout procedures with zero risk of residual arcing. Over six months of continuous heavy industrial operation, the mine eliminated unplanned drive outages by 50% and sustained a 100% workplace safety compliance record.

Related products

ZYQ1 Automatic transfer switch VIEW DETAILS

ZYQ1 Automatic transfer switch

ZYM1L Molded case circuit breaker VIEW DETAILS

ZYM1L Molded case circuit breaker

HGLR Load isolation switch VIEW DETAILS

HGLR Load isolation switch

HR17 Fuse switch disconnector VIEW DETAILS

HR17 Fuse switch disconnector

At ZHNYU Electric, we specialize in the design and manufacture of low-voltage electrical components, and our DC Fused Isolator represents the culmination of 34 years of expertise in power distribution. Our factory, spanning 10,000 square meters, is equipped with over 100 advanced production machines, ensuring precision and consistency. We follow a stringent production process: from high-precision stamping to automated assembly, each step is monitored via our ISO9001 certified quality system. Our product line includes load isolating switches, fuse-type isolating switches, and our flagship DC Fused Isolator, optimized for photovoltaic and industrial applications. With 60+ export countries, we understand global compliance requirements. Our DC Fused Isolator meets CE, CCC, and RoHS standards, and is tested according to IEC 60947-3. The key design aspects include a visible contact gap for safe isolation, high breaking capacity up to 50kA, and a compact IP66 housing suitable for outdoor installations. We incorporate advanced arc quenching technology, ensuring rapid extinguishing of DC arcs. 

Frequently Asked Questions

What is the primary function of a DC Fused Isolator?

A DC Fused Isolator combines an isolation switch and a fuse in one unit, providing a safe method to disconnect DC circuits and protect against overcurrent. It ensures that when maintenance is performed, the circuit is fully de-energized, and in case of a fault, the fuse interrupts the current, preventing equipment damage.
Our DC Fused Isolators are available in ratings from 32A to 125A, with voltage ratings up to 1000V DC. This covers a wide range of systems, from small solar setups to large commercial installations. Each model is tested for DC-21B utilization category, ensuring reliable switching and isolation.
The fuse rating depends on your system's maximum operating current and fault current. As a general rule, the fuse should be rated at least 1.25 times the maximum continuous current to avoid nuisance tripping. For technical assistance, our team can provide coordination studies based on your system parameters. We also offer pre-assembled configurations with gPV fuses for standard applications.
Yes, our DC Fused Isolator features an IP66-rated enclosure, making it dust-tight and protected against powerful water jets. It operates well in ambient temperatures from -25°C to +55°C, making it suitable for deserts, coastal areas, and snowy regions. The housing is UV-resistant, ensuring longevity in direct sunlight.

Related Articles

SwitchLine OT: The Universal Power Switch

31

Aug

SwitchLine OT: The Universal Power Switch

View More
How does a fuse switch disconnector improve electrical safety in industrial settings?

02

Sep

How does a fuse switch disconnector improve electrical safety in industrial settings?

Discover how an advanced fuse switch disconnector enhances industrial electrical safety through reliable circuit isolation, arc flash protection, and OSHA compliance.
View More
What is the difference between an isolator switch and a circuit breaker?

12

Sep

What is the difference between an isolator switch and a circuit breaker?

Understand the differences between an isolator switch and a circuit breaker for electrical isolation and overcurrent protection in power systems.
View More
What are the main advantages of using a knife switch in low-voltage panels?

17

Sep

What are the main advantages of using a knife switch in low-voltage panels?

Discover knife switch advantages in low-voltage panels. A reliable LV disconnect switch provides visual isolation and exceptional thermal stability.
View More

Customer Testimonials

John Visser
Reliable and Efficient DC Protection

We switched to ZHNYU’s DC Fused Isolator for our solar farm projects in the Netherlands. The integrated fuse simplifies our wiring, and the clear switching position improves safety. Their team provided excellent support during installation.

Ahmed Al-Rashid
Outstanding Durability and Compliance

As a distributor in the Middle East, we need products that meet stringent standards. The DC Fused Isolator from ZHNYU is CE and RoHS compliant, and the quality is evident. It handles high temperatures without issues, and the fuse replacement is quick.

Get a Free Quote

Our representative will contact you soon.
Email
Mobile/WhatsApp
Name
Company Name
Message
0/1000
dc isolator dc isolator for solar solar dc isolator switch pv isolator dc power isolator pv array dc isolator switch pv isolator switch solar isolator dc solar isolator pv breaker isolator pv dc isolator dc battery isolator switch dc rotary isolator solar panel dc isolator switch pv array isolator dc voltage isolator solar isolator disconnect dc fused isolator dc rotary isolator switch
Advanced Arc Quenching Technology

Advanced Arc Quenching Technology

DC electrical arcs do not naturally cross zero points, making fault suppression complex in high-voltage photovoltaic and battery applications. ZHNYU Electric integrates zero-crossing magnetic blowout technology alongside arc-splitter grids inside our DC Fused Isolators. This proprietary design stretches, cools, and extinguishes dangerous DC arcs up to 50% faster than standard isolation switches, successfully suppressing short circuits within 10ms. Certified test data verifies a breaking capacity of 50kA without contact degradation or thermal failure. By minimizing arc duration, our isolators protect internal silver-alloy contacts from pitting, significantly extending component operational lifespans and preventing electrical fires in remote commercial installations.
Comprehensive Safety Features for Optimal Protection

Comprehensive Safety Features for Optimal Protection

Safety drives every design detail in ZHNYU Electric DC Fused Isolators. Featuring visible contact gaps, field technicians can visually confirm complete electrical isolation prior to routine inspection. The reinforced IP66 enclosure protects internal mechanisms against high-pressure water jets and abrasive industrial dust, functioning across ambient temperatures from -25°C to +55°C. Built-in padlockable handle mechanisms prevent accidental re-energization during maintenance lockouts. Internal shielding isolates live components during fuse extraction, preventing accidental touch hazards. Tested for 10,000 mechanical cycles and 3,000 electrical operations, our isolators comply with IEC 60947-3 standards, delivering uncompromised safety and durability for demanding global distribution systems.
image

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.

USEFUL LINKS

East Qinghe Road, Shahu Industrial Zone, Liushi Town, Yueqing, Wenzhou, Zhejiang

+86-13587761982

[email protected]

Newsletter

ZHNYU Electric: Explore our products, contact us for business cooperation and subscribe newsletters for latest industry updates.

Copyright © 2026 by ZHNYU ELECTRIC - Privacy Policy