DNH18 Vertical Fuse Disconnect Switch for 185mm Busbar System Reliable Bar-Type Disconnector

The GRL DNH18 vertical fuse disconnect switch is a high-performance protective isolator designed for low-voltage power distribution. A busbar-mounted fuse switch disconnector, it installs directly onto the 185mm busbar system via hanging terminals – no drilling is required – saving installation time and space. Targeted at power engineering companies, photovoltaic system integrators, and industrial switchgear OEMs, the DNH18 serves as a compact industrial electrical isolator for distribution circuits. With its innovative features and robust design, the DNH18 ensures reliable circuit protection and streamlined installation in modern electrical systems.

Applications in Photovoltaic and Industrial Power Systems

As a versatile vertical fuse disconnector, the DNH18 is widely used in renewable and industrial installations. It functions as a photovoltaic combiner box fuse switch, safely isolating each string of solar panels in PV combiner boxes. In industrial control panels and motor control centers, the DNH18 acts as a low-voltage circuit isolator for transformers, drives, and cable branch circuits. Its compact, modular design makes it ideal for confined distribution boards and box-type substations. Switchgear manufacturers benefit from the DNH18’s space-saving structure when designing custom panels and distribution cabinets.

Other Use Cases

Solar Farm Combiner Box: In utility-scale PV systems, DNH18 switches protect string inverters and DC/AC combiner circuits. Their lockable fuse switch design and optional monitoring help meet safety codes and streamline maintenance in renewable energy projects.

Industrial Distribution Panel: Switchgear OEMs install the DNH18 in factory distribution boards and motor control centers. The vertical fuse disconnect provides isolated circuits for heavy machinery, with padlock safety and fuse monitoring ensuring compliance in industrial environments.

Box-Type Substation Feeder: Power engineering firms use the DNH18 as a low-voltage fuse isolator on busbar-fed feeders in compact substations and cable branch boxes. Its busbar-mounted installation saves space and integrates with NH fuse links for effective feeder protection.

Renewable Energy Integration: The DNH18 is also used in wind turbine base stations and hybrid microgrids, offering a reliable fuse switch solution for emerging off-grid and renewable power infrastructures.

By combining rugged construction with intelligent features and broad compatibility, the GRL DNH18 fuse switch disconnector delivers safe, efficient low-voltage power protection across a range of applications.

FAQ

Q1: What is the difference between a vertical fuse disconnector and a fuse isolator switch?
A fuse isolator switch provides isolation only, while a vertical fuse disconnector integrates a fuse to ensure overcurrent protection with disconnection.

Q2: Can a vertical fuse holder be used in photovoltaic applications?
Yes, the vertical fuse disconnector 400A and vertical fuse disconnector 630A are widely applied in PV combiner boxes and power distribution cabinets.

Q3: What standards do vertical fuse disconnectors comply with?
The DNH18 series meets IEC standards for switch disconnector and fuse switch disconnector applications, ensuring global safety compliance.