GN30-12D Indoor Isolator Switch for 12kV Panels

The GN30-12D Isolator switch is a compact indoor rotary isolator designed for 12kV power systems, providing safe and visible disconnection of high-voltage circuits in metal-clad switchgear. It is widely used in indoor panels such as KYN28A-12, HXGN, and similar enclosures.

🔧 Product Overview

The GN30-12D features a rotary knife-type contact structure, where the blade rotates around an axis for open/close operation. Its vertically aligned phases reduce footprint, improve busbar layout, and support panel integration. Available in multiple current ratings, the design also supports optional grounding.

Why Choose GN30-12D?
Ideal for 12kV indoor switchgear
Rotary contact design: compact & reliable
Mechanical interlock and grounding optional
Maintenance-friendly, tested over 2,000 cycles
Fully compliant with IEC 62271 standards

📐 Technical Specifications

Parameter	Value
Rated Voltage (Ur)	12 kV
Rated Frequency	50 Hz
Rated Current	400 A / 630 A
Short-Time Withstand (4s)	20 kA
Peak Withstand Current	50 kA
Power Frequency Withstand	42 kV (1 min)
Lightning Impulse Withstand	75 kV
Mechanical Life	≥ 2000 operations
Operating Mechanism	Manual rotary handle
Installation Position	Indoor panel mount

🌍 Applications

KYN28A-12 switchgear for incoming/outgoing lines
Transformer room control panels
Capacitor banks and harmonic filter panels
Industrial motor control centers (MCC)
OEM switchgear manufacturing integration

📊 Project Case: GN30-12D in Power Plant Panels

🔷 Project: Khulna Thermal Power Station, Bangladesh
Scope: Over 500 GN30-12D units installed in capacitor bank cabinets and 12kV MCCs.
Results:

Streamlined panel assembly and layout
Safe maintenance with optional grounding
No switching failure over 18 months in humid, dusty conditions

Source: Khulna Power Co. Technical Summary 2022

🛠 Installation & Wiring Tips

Secure the switch using standard mounting holes inside the switchgear panel.
Connect vertical-phase busbars to input/output terminals.
Use the rotary handle to manually open/close the contact blades.
Ensure phase alignment, interphase distance, and insulation clearances;
Optional: install a grounding knife on the lower base for maintenance safety.

❓ Frequently Asked Questions (FAQ)

1. What’s the key difference between GN30-12 and GN22-12?
GN30 is rotary-type and more compact, while GN22 uses horizontal blade motion, requiring more space.

2. Can GN30-12D fit inside KYN28A-12 switchgear?
Yes, it’s specifically made for vertical-phase metal-clad panels like KYN28, HXGN.

3. Does the “D” mean it includes a grounding switch?
“D” indicates grounding function is available as an add-on.

4. How often should it be maintained?
Visual inspection and light lubrication once every 1–2 years is sufficient.

5. Can I use it in 10kV or 11kV networks?
Yes. It's rated for up to 12kV, and commonly used across 10/11kV systems globally.