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Founded in 1992, Zhejiang GRL Electric Co., Ltd. operates a 4,000-square-meter facility and employs over 500 professionals. GRL integrates R&D, production, sales, and service, specializing in electrical protection and connection solutions.
Our product portfolio includes low-voltage enclosed busbar systems, load isolator switches, fuse switch disconnectors, knife switches, transfer switches, medium-voltage isolation switches, medium-voltage drop-out fuses, copper busbars, fuse holders, fuse bases, surge protection devices, lightning surge arresters. These products serve diverse sectors, including power distribution, industrial control, automotive manufacturing, and renewable energy, meeting the varied needs of our global customer base. Rigorous testing ensures all products comply with national and international standards, guaranteeing exceptional reliability and performance.
A leading player in China’s low-voltage busbar systems and disconnector switch market, GRL has delivered hundreds of premium electrical components and thousands of custom solutions. Our reliable products and professional service make us a trusted long-term partner for clients worldwide.
Combines the overcurrent protection of a fuse with the power isolation of a disconnector switch, enabling fast circuit disconnection during faults for enhanced safety.
The nylon casing meets V0 flammability standards, offering excellent heat resistance and corrosion protection, making it ideal for harsh industrial environments.
Its compact structure and simple wiring reduce installation and maintenance costs. It is available in both plug-in and fixed mounting options to suit various application scenarios.
It has been rigorously tested for temperature rise and has side heat dissipation vents to ensure safe operation during prolonged use.
Superior wear resistance, with a rated electrical operation cycle of over 200 times, ensuring a long product lifespan.
An optional fuse monitor alerts users when the fuse blows, enabling remote monitoring and timely maintenance.
A fuse switch disconnector is an electrical device designed to perform two critical functions: disconnecting a circuit and providing protection against overcurrent conditions. It combines the functionality of a disconnect switch and a fuse into a single unit, making it an efficient solution for both circuit isolation and overcurrent protection. The fuse within the switch disconnects the circuit when excessive current (from an overload or short circuit) flows through the system, ensuring that electrical components and wiring are protected from damage.
The fuse switch disconnector allows for quick and safe isolation of a circuit during maintenance, repairs, or fault conditions. It provides a clear “off” position that ensures no current is flowing through the circuit, allowing technicians to work on the equipment safely. When blown due to overcurrent, the fuse also protects the electrical system by preventing further damage or potential fire hazards.
A fuse switch disconnector operates in the following manner:
1. Isolation: The disconnect switch within the unit isolates the circuit by physically separating contacts. This ensures that no electrical current can flow when maintenance or repair is being conducted, providing safety for technicians and preventing accidental electrical shocks.
2. Protection: The fuse inside the disconnector is designed to blow when an overcurrent condition occurs. The fuse is selected based on the system’s current rating, and when excessive current flows due to a fault, the fuse melts, interrupting the circuit. This prevents damage to downstream electrical components and ensures the safety of the overall system.
3. Restoration: Once the fuse is replaced and the fault is cleared, the switch can be closed, and the circuit is re-energized. The unit can then provide ongoing protection to the system, preventing any further overloads or short circuits.
GRL DNH18 vertical fused switch refers to a specific configuration of fuse switch disconnectors, where the switch operates in a vertical orientation. This is particularly useful in space-constrained environments where horizontal installation might not be feasible. Vertical fused switches offer the same protection and functionality as traditional fuse switch disconnectors but with the added benefit of being designed for vertical mounting. This makes them ideal for applications in areas where space optimization is essential.
GRL Fuse Switch Disconnectors are usually used with NH fuses. These fuses are designed to offer high-breaking capacity and are often used in applications where overcurrent protection is crucial. These fuses provide high interrupting capability to protect circuits from overcurrent.
GRL NH fuses are available in AC 690V and DC 400V variants, making them suitable for diverse applications. They can be paired with different-frame DC fuse disconnector switches, providing reliable energy storage and PV systems protection. Additionally, DC fuses can be used with fuse bases, offering flexible installation options.
The NH fuse switch disconnector is widely used in low-voltage installations, providing critical protection for transformers, motors, and other large electrical equipment. These units ensure both safe isolation of circuits and protection against overloads or short circuits, preventing extensive damage to electrical systems.
DNH1-Fuse-Switch-Disconnector DNH18-Fuse-Switch-Disconnector NH-fuse Yes, the GRL fuse switch disconnector is built to handle high-temperature environments with ease. It has passed rigorous temperature rise testing to ensure its performance even under challenging conditions. The switch is designed with dedicated heat dissipation grooves on the sides, improving heat dissipation and achieving excellent temperature rise performance that surpasses national standards. Additionally, the housing is made from V0-grade flame-retardant nylon material, providing enhanced fire resistance and durability.
With these advanced design features, stringent testing, and high-quality materials, the DNH18 disconnector offers exceptional performance and reliability in high-temperature environments, making it a trusted choice for demanding applications.
A fuse switch disconnector needs replacing if you notice signs like: visible damage to the fuse or terminals (melting, burning), a burning smell coming from the unit, frequent tripping of the switch, sizzling sounds from the outlets, or difficulty switching the unit on and off;all of these indicate potential overheating or malfunctioning of the switch and could pose a safety hazard, requiring a professional electrician to inspect and replace it.
If the fuses within the switch are visibly melted or the terminals show signs of burning, it’s a clear sign of damage and needs replacement.
A burning smell coming from the switch or nearby outlets is a serious warning sign of electrical problems and should be addressed immediately.
If the switch frequently trips even with normal loads, it could indicate a failing mechanism within the switch.
If the switch is hard to turn on or off, or gets stuck in a position, it may be faulty and need replacement.
Sparks visibly jumping between the switch contacts when operating can indicate a worn-out switch.
Always contact a qualified electrician to diagnose and replace a faulty switch.
Periodically check your electrical panel to ensure all switches and fuses are in good condition.
If your electrical system still uses fuses instead of circuit breakers, consider upgrading to a modern system for increased safety.
A: Yes, thanks to its robust casing and high resistance to environmental factors like heat and corrosion, it is suitable for both indoor and outdoor use.
A: No, our fused disconnector switches feature a compact design and simple wiring, significantly reducing installation time and costs. They also support both plug-in and fixed mounting options to suit different applications.
A fused switch disconnector in a modular busbar system provides significant benefits including reliable overcurrent protection with visible isolation, enhanced safety due to the fuse element that melts during faults, easy circuit isolation for maintenance, flexibility in fuse selection for precise protection, and a compact, modular design that integrates seamlessly with the busbar system; essentially offering both switching capability and dependable protection against electrical faults within the system.
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