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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.
Our load isolator switch features an innovative elastic-accumulating acceleration mechanism that instantly releases, achieving make-and-break speeds of up to 13.8 m/s. This rapid switching significantly improves arc extinguishing capability, ensuring safe and reliable circuit interruption during load break operations. Moreover, it fully complies with major international and national standards—including IEC60947-1, IEC60947-3, GB/T14048.1, and GB/T14048.3—guaranteeing outstanding performance and adherence to strict safety guidelines.
GRL load isolating switch is engineered with safety in mind, featuring both direct operation (with a centrally mounted handle) and side-handle load break switch options for external panel control. Optional observation windows allow operators to easily verify the contact status, ensuring clear visual confirmation of the on/off state. An integrated three-lock mechanism prevents accidental or erroneous operation, while built-in auxiliary contact options further enhance functionality and enable seamless integration with other control systems.
Our load disconnector switch is suitable for AC 50Hz systems with rated voltages up to 660V and DC systems up to 440V, covering a wide range of environments such as industrial power distribution, photovoltaic installations, data centers, and commercial facilities. Available in both 3-pole and 4-pole configurations (with or without a neutral option) and offering current ratings from 63A to 3150A, it provides tailored solutions for infrequent switching and safe electrical isolation in various load break applications.
Designed for flexibility, the load break switch supports both direct operation and cabinet door operation. With extended shafts for external control and a user-friendly interface, it simplifies installation and maintenance in diverse applications. This versatile design makes it ideal for industrial power systems, renewable energy projects, and commercial buildings, ensuring reliable isolation during both routine maintenance and emergencies.
Our product range is extensive, ideal for industrial distribution equipment with AC-rated voltages up to 690V and conventional thermal currents up to 3150A. The HGLR load break disconnector series offers manual multi-pole load break disconnector-fuse units with high dielectric performance. The DNH50 series is suitable for low-voltage distribution networks of DC 1500V. This comprehensive lineup ensures that customers can find the optimal solution for their specific electrical isolation needs.
Constructed with a high-quality enclosure made of glass fiber–reinforced unsaturated polyester resin, the GRL load isolation disconnector offers excellent flame resistance, high dielectric strength, impact resistance, and carbon resistance. This robust design ensures safe operation even in harsh environments, thereby reducing maintenance costs and extending service life. Additionally, the device employs a parallel double-gap contact structure with a self-cleaning function and silver-plated copper alloy contacts, providing dual contact surfaces and ample insulation clearance to enhance electrical performance.
A Load Isolation Switch is an electrical switching device designed to disconnect a circuit while carrying a rated current safely. It is primarily used for isolation and infrequent switching, ensuring that electrical equipment can be safely maintained or repaired without the risk of accidental reconnection.
英文目录-HGL-load-isolator-switches In electrical power systems, both on-load isolator switches and circuit breakers play crucial roles in circuit protection and control. While they may appear similar in function, they serve distinct purposes. Understanding the differences between these two devices can help select the right component for a specific application.
1. Definition and Function
On-Load Isolator Switch: An on-load isolator switch is a device used to disconnect electrical circuits while carrying a rated load. It ensures the safe isolation of electrical equipment for maintenance and troubleshooting. Unlike a circuit breaker, it does not provide short-circuit or overcurrent protection.
Circuit Breaker: A circuit breaker is designed to protect electrical circuits by automatically disconnecting the power supply when abnormal conditions such as overloads or short circuits occur. It not only isolates the circuit but also provides protective functionalities.
2. Key Differences
| Feature | On-Load Isolator Switch | Circuit Breaker |
| Primary Function | Manually or automatically isolates a circuit under load | Automatically disconnects power during faults |
| Protection Capability | No short-circuit or overload protection | Provides short-circuit and overload protection |
| Operating Mechanism | Mechanical operation with visible contacts | Automatic operation using trip mechanisms |
| Arcing Control | Limited or no arc extinguishing capability | Arc-quenching mechanism to handle faults |
| Application | Used for circuit isolation and maintenance | Used for circuit protection and disconnection during faults |
3. Applications of Load Isolator Switch
GRL Electric provides load isolator switches rated for AC 690V and DC 1500V, making them suitable for a wide range of applications, including:
PV Systems: DC isolator switches ensure safe disconnection of solar panels, inverters, and combiner boxes.
Industrial Power Systems: Used in switchgear and motor control centers for circuit isolation.
Data Centers: Provides safe power isolation for UPS systems and critical equipment.
EV Charging Infrastructure: DC isolators are essential in battery storage and electric vehicle charging stations.
Power Distribution Systems: Used in substations and switchgear to regulate power supply.
Conclusion
While an on-load isolator switch and a circuit breaker are essential components in electrical systems, they serve different functions. On-load isolator switches ensure safe disconnection under load conditions, whereas circuit breakers provide critical protection against overloads and short circuits. GRL Electric’s load isolator switches are engineered to meet demanding applications, ensuring reliability and operational safety in various industries.
For more information about our isolator switches and circuit protection solutions, visit GRL Group.
英文目录-DNH40-isolator-switch 英文目录-HGL-load-isolator-switches DNH50 Load Break Switches play a crucial role in modern low-voltage electrical distribution by providing a safe, reliable means to interrupt or isolate circuits under normal operating conditions. Also known as isolation switches or disconnect switches, a Load Break Switch is engineered not only to provide clear circuit separation for maintenance or emergency scenarios but also to carry and interrupt currents without sustaining damage to contacts or connected equipment.
At the heart of every Load Break Switch lies its capability to handle load-making and load-breaking duties. Whether it’s a manual Load Break Switch operated via a robust lever or a motorized Load Break Switch integrated into a remote control system, these devices ensure that maintenance personnel can service downstream equipment without shutting down the entire network. The visible contacts common on many models afford operators immediate visual confirmation of the switch position, enhancing on-site safety.
GRL manufacturer offers both indoor Load Break Switches in insulated housings and weatherproof outdoor Load Break Switches designed to withstand harsh environmental conditions. Low-voltage load break switches intended for photovoltaic or industrial applications often comply with IEC or UL standards, providing assurance that your safety isolator switch meets the rigorous performance criteria required for solar PV combiner boxes, motor control centers, or conventional distribution panels.
Choosing the right Load Break Switch for your installation involves considering factors such as rated voltage, interrupting capacity, frame size, and actuation style. For solar-centric projects, look specifically for Load Break Switches rated for 1,000 Vdc or higher, for example, GRL DNH50 load Isolator Switch, The DNH50 series DC Switch isolator is suitable for power systems with a rated voltage of DC 1500V and below, and a rated current of 50A and below.it can be used for infrequent switching on and off to isolate and disconnect circuits. The device carries the appropriate PV-use certification.
If your application demands frequent remote operation, prioritize motorized Load Break Switches with built-in auxiliary contacts for feedback and integration into building-management systems.
Maintenance of Load Break Switches is straightforward, but essential: periodic inspection of visible contacts, torque checks on terminal connections, and verification of insulation integrity are all part of a sound preventative-maintenance program. In environments prone to dust or corrosive atmospheres, selecting a weatherproof or flame-retardant model will prolong service life and sustain reliable insulation performance over years of operation.
In summary, whether you need a compact indoor isolation switch for a manufacturing cell or a heavy-duty outdoor disconnect switch for a solar farm, Load Break Switches offer the flexibility, safety, and durability required by today’s power-distribution challenges. By matching the device’s interrupting rating, enclosure type, and actuation mode to your system’s demands, you ensure uninterrupted performance, clear isolation for maintenance, and the highest level of personnel protection.
英文目录-HGL-load-isolator-switches DNH50 The location of an isolator switch is crucial for ensuring safety, ease of access, and compliance with electrical regulations. The placement depends on its application and the type of electrical system it is used in.
General Guidelines for Isolator Switch Location:
1. Close to the Equipment it Controls
An isolator switch should be installed near the electrical device or system it disconnects, such as motors, switchgear, or photovoltaic (PV) inverters. This ensures quick access for maintenance and emergency shutdowns.
2. Visible and Accessible Position
It should be placed in a clearly visible and easily reachable area so that workers or emergency personnel can operate it safely. In industrial settings, it is often mounted on panels or walls at an appropriate height.
3. Outdoor Installations (Weatherproof Enclosures):
For outdoor applications like PV systems or high-voltage power distribution, isolator switches should be installed in IP-rated enclosures to protect against dust, moisture, and extreme weather conditions.
4. Near the Main Electrical Panel (for Household and Commercial Use)
In residential or commercial buildings, isolator switches are commonly located near the main breaker panel or electrical distribution board for power disconnection during maintenance or emergencies.
5. Compliance with Electrical Safety Standards
Placement must follow national and international electrical codes (e.g., IEC, NEC, or local regulations) to ensure compliance with safety and operational requirements.
For GRL Electric’s AC 690V and DC 1500V on-load isolator switches, installation should be based on the specific electrical system, ensuring proper isolation for photovoltaic, industrial, or data center applications.
If you have any needs for customized solutions, you can contact our professional technical team.
HGL-16003P.4P1250、1000、800 CE-HGLR-160□□ CE-HGLR-250□□ CE-HGLR-400□□ CE-HGLR-630□□ 
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