GN27-40.5 Indoor Horizontal Isolator Switch | 40.5kV

The GN27-40.5 indoor  Isolator switch is purpose-built for 40.5kV medium voltage systems, offering a compact horizontal structure ideal for restricted indoor environments. Designed with robust mechanical integrity and reliable contact performance, this isolator provides visible disconnection and maintenance safety in switchgear panels, distribution boards, and compact substations.

Product Overview

The GN27-40.5 switch is a three-phase, high-voltage disconnect device used to isolate power circuits during maintenance. Unlike conventional designs, this unit features a horizontal blade mechanism, minimizing installation height and enabling efficient operation within confined indoor switchgear cabinets.

Its arc-resistant contacts and ceramic insulator support ensure operational stability even in dusty or humid conditions. Rated for 40.5kV and 1250A, it meets the increasing demand for compact yet high-capacity indoor disconnection solutions.

Key Technical Parameters

Parameter	Specification
Rated Voltage	40.5 kV
Rated Current	1250 A
Short-Time Withstand	31.5 kA / 4s
Peak Withstand Current	80 kA
Insulation Level	95/185/215 kV (BIL)
Installation Type	Horizontal, wall-mounted
Standard Compliance	IEC 62271-102, GB1985

Unique Application Scenarios

• Compact Switchgear Retrofit: Perfect fit for indoor systems upgrading from vertical to horizontal switch designs.
• Renewable Energy Stations: Used in wind farm substations and solar control cabinets requiring safe isolation.
• Industrial Infrastructure: In metallurgical plants or mining, where compact isolation is vital under limited space.

Why GN27-40.5 Is Different?

• Horizontal Design Efficiency: Saves up to 25% installation depth compared to vertical designs.

• Improved Arc Quenching: Equipped with special arc suppressor plates for enhanced contact lifespan.

• Dust-Resistant Sealing: Improved contact chamber with silicone-lined covers for indoor resilience.

• Custom Terminal Options: Supports busbar or cable terminal types depending on customer design needs.

Certifications & Quality Assurance

• Fully tested under IEC 62271-102 and GB1985 standards.

• Type-tested at national HV testing laboratories.

• Manufactured in an ISO9001 and ISO14001-certified facility.

• Long-term reliability proven in Qatar Energy (2023) and EDF France retrofit projects (2022).

Installation & Maintenance

• Mounting Method: Horizontal or wall-mounted inside metal-clad panels.

• Interlock Ready: Compatible with mechanical interlocks for breaker safety.

• Low Maintenance: Needs inspection only every 2–3 years in indoor dry environments.

• Wiring Diagram & 3D Drawings: Available upon request for integration in BIM or CAD systems.

What Global Clients Say

✓ Paul N., Switchgear Engineer, Germany:
"We use GN27-40.5 switches in multiple retrofit jobs due to their compact footprint. Very efficient and reliable."

✓ Greg M., Utilities Contractor, South Africa:
"Installation was easy, even with limited space. The isolator has worked flawlessly through two summers."

✓ Marie F., Electrical Consultant, France:
"Accurate technical specs, on-time delivery, and a strong locking mechanism—ideal for utility applications."

✓ Tim R., Substation Design Lead, Australia:
"I liked the modularity. We integrated it smoothly with VCB panels. Definitely a cost-effective upgrade."

✓ Luis J., Solar EPC Engineer, Chile:
"Used it in PV substations—clean arc-breaking and good sealing for desert applications."

FAQ

• Is the GN27-40.5 suitable for GIS panels?
No, it is designed for AIS-type indoor panels with a horizontal isolation layout.

• Can I request different mounting options?
Yes. Custom brackets are available for retrofit or ceiling-side installations.

• What is the delivery time?
Usually 15 working days. Large orders can be scheduled in partial shipments.

• Does it support motorized operation?
Not by default, but it can be modified to add a motor drive for remote switching.

• What protection does it offer during maintenance?
A visible break and lockout provision ensures zero energy at the work point.

🔍 Explore More Indoor  Isolator Switches

Looking for different voltage levels or configurations? Visit our full indoor  isolator switch catalog here:
Indoor  Isolator Switch Series

📌 About the Manufacturer

Wei Shoe Elec is a trusted high-voltage equipment manufacturer based in Yueqing, China, serving customers across Europe, North America, and Southeast Asia. With ISO9001, ISO45001, and ISO14001 certifications, our products meet IEC and GB standards and are tested for quality and performance.

🔧 This product content is written by Thor, Senior Electrical Engineer at Wei Shoe Elec, specializing in high-voltage switching solutions and grid safety optimization.
📞 Phone: +86-0577-62788197
📱 WhatsApp: +86 159 5777 0984
📧 Email: thor@weishoelec.com