GN38-12 Indoor Rotary Isolator Switch for 12kV Panels

The GN38-12 indoor Isolator switch is a compact, rotary-type isolator designed for 12kV indoor switchgear, particularly suitable for metal-enclosed and withdrawable systems. Its rotating contact blade design ensures a quick, stable disconnect with minimal arcing and contact wear.

🔧 Product Overview

The GN38 series uses a double-breaking rotary blade mechanism, improving arc suppression and reducing mechanical stress during operation. It's ideal for compact GIS, KYN28 cabinets, or ring main units (RMUs) where space and reliability are critical.

Key Advantages:

Rated for 12kV systems with 50Hz frequency
Rotary contact for reduced bounce and wear
Compact footprint ideal for withdrawable switchgear
Supports earthing switch integration
Available in vertical and horizontal configurations

📐 Technical Specifications

Parameter	Value
Rated Voltage	12 kV
Rated Current	400 / 630 / 1250 A
Short-Time Withstand Current	25 kA / 4s
Lightning Impulse Withstand	75 kV
Power Frequency Withstand	42 kV
Mechanical Life	≥ 2,000 operations
Installation	Indoor, panel-mounted
Actuation Type	Manual or electric motor
Standards	IEC 62271-102

🌍 Typical Applications

Withdrawable KYN28 switchgear units
RMU compartments requiring internal isolation
Indoor transformer and feeder panels
Medium-voltage motor control centers
Mining, urban substations, and compact GIS bays

📊 Case Study: Italy Compact Substation Project (2023)

In a 2023 project for a municipal substation in Italy, over 120 GN38-12 rotary isolators were used in 12kV KYN28 cabinets.
Impact:

Reduced panel width by 15% due to compact size
Improved arc fault resistance inside GIS
Faster disconnection cycles and lower contact maintenance

Source: Northern Italy Distribution Utility, 2023

🛠 Installation & Operation Tips

Mount the base to the panel or switchgear frame.
Ensure blade alignment and clearances per diagram.
Connect the busbar and the outgoing cable to the designated terminals.
Test the mechanical rotation of the isolator before energizing.
Regularly lubricate rotation joints every 5 years or 1,000 operations.

❓ Frequently Asked Questions (FAQ)

1. What makes GN38 different from GN30?
GN38 uses a rotary blade, providing faster opening and less contact erosion. It's better suited for compact, modern panels.

2. Can I install an earthing switch on GN38?
Yes, we offer integrated or side-mounted earthing switches as optional accessories.

3. Is the GN38 motor operable?
Yes, it's compatible with electric motor operation for remote switching applications.

4. What cabinet types are compatible?
Commonly used with KYN28, XGN15, or compact GIS switchgear.

5. What’s the operating lifespan?
Over 2,000 mechanical operations with minimal maintenance.