GN27-40.5D Indoor High Voltage Isolator Switch

The GN27-40.5D Indoor High Voltage Isolator Switch is a high-performance electrical isolation device meticulously designed by Weisho Electric, leveraging 12 years of profound industry expertise. It is engineered for indoor high-voltage power distribution systems up to 40.5kV. The switch plays a pivotal role in substations, power plant auxiliary systems, and various industrial power distribution rooms by providing reliable electrical isolation points. This ensures the safety of equipment maintenance personnel and maintains the stable operation of the power system.

We deeply understand the stringent reliability requirements for equipment in high-voltage environments. The design and manufacturing of the GN27-40.5D embody Weisho Electric's professional wisdom and commitment to superior quality in the electrical equipment sector.

GN27-40.5D Indoor High Voltage Isolator Switch

Key Features & Core Advantages

The GN27-40.5D isolator switch is more than just a simple isolation device; it integrates several innovative designs aimed at providing you with unparalleled safety and operational experience:

Innovative Compact Design, Maximizing Space Utilization: The GN27-40.5D adopts an optimized three-dimensional design, resulting in a compact structure and a significantly smaller footprint compared to similar products. For indoor switchgear cabinets and power distribution rooms with limited space, this means you can utilize valuable site resources more efficiently, reduce infrastructure costs, and reserve ample room for future system expansion.
Superior Insulation Performance, Ensuring Operational Safety: This switch uses high-strength ceramic insulators and an optimized creepage distance design. This ensures stable and reliable insulation performance even in harsh operating environments such as humid or polluted conditions, effectively preventing flashover incidents and fundamentally safeguarding operator and equipment safety.
Reliable Mechanical Interlocking Mechanism, Eliminating Misoperation: The GN27-40.5D incorporates a clear and dependable built-in mechanical interlocking mechanism, allowing for both electrical and mechanical interlocking with circuit breakers and earthing switches. This completely prevents operational accidents, such as closing under load, significantly enhancing the safety and reliability of the power system.
Lightweight Operation, Easy Maintenance: Employing an advanced helical transmission mechanism, the GN27-40.5D ensures low operating torque and smooth manual or motorized operation. The contact resistance between the moving and fixed contacts is low, resulting in minimal temperature rise. This reduces the workload for operation and maintenance personnel, lowering the frequency and cost of routine maintenance.
High Withstand Capability, Addressing Complex Conditions: The GN27-40.5D possesses excellent rated short-time and peak withstand current capabilities. In the event of a short-circuit fault in the power system, it can withstand significant current impacts while maintaining structural integrity and stable performance, providing reliable protection for downstream equipment and ensuring rapid system recovery.

Working Principle

The GN27-40.5D high-voltage isolator switch primarily operates through its unique helical transmission mechanism, which drives the conductive blade to rotate or translate, achieving separation from or closing with the fixed contacts. When the blade is fully open and rotated to the isolation position, a visible air insulation distance, compliant with safety standards, is formed between the contacts.

This completely disconnects the high-voltage circuit, providing a safe working environment for subsequent inspection or maintenance. Its essence lies in achieving complete electrical separation of the line from the power source through mechanical forced isolation—a crucial step in ensuring personnel safety and equipment maintenance.

Detailed Technical Specifications

Parameter Name	Unit	GN27-40.5D (Typical Value Range)
Rated Voltage	kV	40.5
Rated Current	A	630 / 1250 / 2000 / 2500
Rated Short-time Withstand Current (4s)	kA	20 / 31.5 / 40
Rated Peak Withstand Current	kA	50 / 80 / 100
Rated Insulation Level (1min Power Frequency Withstand Voltage, Phase-to-Ground/Phase-to-Phase)	kV	95
Rated Insulation Level (Lightning Impulse Withstand Voltage, Phase-to-Ground/Phase-to-Phase)	kV	185
Rated Insulation Level (1min Power Frequency Withstand Voltage, Across Open Contacts)	kV	115
Rated Insulation Level (Lightning Impulse Withstand Voltage, Across Open Contacts)	kV	215
Mechanical Endurance	Cycles	2000
Ambient Temperature Range	°C	-25 ~ +40
Relative Humidity	%	Daily average≤95%, Monthly average≤90%
Altitude	m	≤1000
Earthquake Intensity	Degree	≤8
Operation Method	-	Manual / Motorized

GN27-40.5D Indoor High Voltage Isolator Switch

Typical Application Scenarios & Global Case Studies

The GN27-40.5D Indoor High Voltage Disconnect Switch, with its outstanding performance and reliability, has been widely applied in numerous critical power projects worldwide:

Tanzania Urban Grid Upgrade: In a major urban grid modernization project in Tanzania, the GN27-40.5D was successfully integrated into newly built substations. Its compact design and excellent insulation performance perfectly suited the limited space and helped enhance the grid's long-term reliability.
Brazil Industrial Park Power Optimization: The lightweight operating mechanism and long mechanical life of the GN27-40.5D met the frequent operational demands of an industrial park in Brazil. Its multi-interlocking mechanism effectively ensured electrical safety during production line maintenance.
Indonesia Data Center Power Assurance: For a data center expansion project near Jakarta, the GN27-40.5D's compact design and high reliability provided a stable and secure power foundation, perfectly adapting to the data center's space constraints.
Saudi Arabia Urban Rail Transit Power Supply: In a Riyadh city rail project, the GN27-40.5D demonstrated its excellent heat resistance and high reliability, ensuring safe and stable power supply for the rail system even under heavy loads and high temperatures.

Installation, Maintenance, & Safety Assurance

Convenient Installation: The GN27-40.5D features a standardized design, ensuring a simple and rapid installation process. We can provide detailed installation dimension drawings and professional on-site guidance as per client requirements.

Low Maintenance Needs: Thanks to high-quality materials and precise manufacturing, this product boasts high reliability and an extended maintenance-free period, significantly reducing operational costs for users.

Safety First: In addition to the built-in mechanical interlocks, we provide clear operational indicators and optional earthing switches to further enhance safety. The product fully complies with international and national standards such as GB and IEC, giving users peace of mind.

Frequently Asked Questions (FAQ)

Q: What is the average service life of the GN27-40.5D disconnect switch?
A: According to IEC standards and our rigorous testing, the mechanical endurance of the GN27-40.5D reaches 2,000 operations, ensuring long-term stable performance.
Q: Does this disconnect switch support motorized operation?
A: Yes, the GN27-40.5D offers both manual and motorized operation options, allowing users to choose based on their specific needs and automation requirements.
Q: Can the GN27-40.5D operate normally in extreme temperatures or humid environments?
A: The design of the GN27-40.5D fully considers various environmental conditions. Its insulation performance and anti-corrosion treatment enable it to adapt to a wide range of temperatures and humidity levels. Please refer to the technical specifications table for specific environmental parameters.
Q: How does Weisho Electric ensure product quality and delivery time?
A: Weisho Electric holds ISO9001 quality management system certification, and all products undergo stringent factory testing. We have an efficient production management system to ensure the timely delivery of high-quality products.
Q: How does the GN27-40.5D handle short-circuit conditions?
A: With a rated peak withstand current of up to 100kA, the GN27-40.5D is designed to withstand significant fault currents without deformation. Contact our technical team for the full type test report and performance curves.

Weisho Electric: Your Trusted Partner for High-Voltage Electrical Equipment

As a leading manufacturer with a 12-year history, Weisho Electric Co., Ltd. is dedicated to providing high-quality electrical equipment solutions to clients worldwide. The GN27-40.5D Indoor High Voltage Disconnect Switch is another testament to our commitment to technological innovation and customer satisfaction. We operate with a comprehensive quality management system, meticulously controlling every stage from raw material procurement to product ex-factory, ensuring that every piece of equipment meets world-class quality standards. Choosing Weisho Electric means choosing safety, efficiency, and reliability.