11kV Medium Voltage Switchgear Complete Guide: Types and Selection

11kV Medium Voltage Switchgear Complete Guide: Types and Selection

11kV medium voltage switchgear is the standard distribution switchgear for industrial plants, commercial buildings, utilities and renewable projects across many countries. Choosing the right panel type directly affects protection, reliability and operating cost. This guide compares the main types and gives a clear selection path.

1. The Two Main Types

• Air-insulated switchgear (AIS): economical, visible isolation, needs more room.
• Gas-insulated switchgear (GIS) / ring main unit (RMU): compact, sealed, for tight spaces.

2. When to Use Which Type

Scenario	Recommended Type
Large industrial switchroom	Air-insulated metal-clad panels
Urban vault or kiosk	GIS / RMU compact
Transformer protection	Fuse-switch or breaker panel
Renewable collection	GIS with vacuum breaker

3. Core Ratings to Specify

For 11kV systems, confirm 12kV-rated switchgear (industry standard rating above 11kV operating), rated current 630A to 2500A, and short-circuit capacity 20kA to 31.5kA. Protection can be fuse-based or relay-based with a vacuum circuit breaker.

4. Protection and Control

A vacuum circuit breaker with a numerical relay provides reliable overcurrent and earth fault protection. For transformer feeders up to about 1000kVA, a fuse-switch is a low-cost alternative. Add remote monitoring where the panel is unattended.

5. Related Guides

To choose between distribution topologies, compare our SF6 Gas Insulated Switchgear Guide and the GIS Installation and Commissioning Guide. For outdoor solutions, see the SF6 Gas Insulated Switchgear Guide.

6. Installation Requirements

• Indoor panels need a dry, ventilated switchroom with cable trenches.
• Allow front access for breaker racking and rear access for cabling.
• Ensure adequate earthing and IP2X to IP4X protection levels.

7. Cost and Lead Time in 2026

A basic 11kV feeder panel with a vacuum breaker runs $4,500–$8,000 ex-works. High-current incomers and complex protection schemes add cost. Typical lead time is 20–35 days.

Frequently Asked Questions (FAQ)

1. Is 11kV switchgear rated at 12kV?
Yes, standard panels are rated 12kV to provide margin above the 11kV operating voltage.

2. What is the difference between AIS and GIS?
AIS uses air insulation and needs more space; GIS is compact and sealed with gas insulation.

3. Can I retrofit a numerical relay on an old panel?
Yes, most manufacturers offer relay replacement and retrofits.

4. What protection do transformer feeders need?
Fuses up to about 1000kVA; above that use a breaker with overcurrent and earth fault protection.

5. Which standard applies?
IEC 62271-200 for switchgear assemblies.

6. What is the usual delivery time?
20–35 days ex-works for standard configurations.

Why Choose Electric-GS

Electric-GS is a leading OEM/ODM manufacturer of medium voltage switchgear in Yueqing, China. We supply IEC-compliant 11kV medium voltage switchgear with full test reports and custom control schemes. Email info@electric-gs.com or WhatsApp +86 135 8897 8050. See Electric-GS solutions and Electric-CN products.