Modular Double Busbar Switchgears: A Complete Buyer’s Guide for Overseas Power Projects

In modern power distribution networks, Modular Double Busbar Switchgears have become an essential choice for utilities, industrial facilities, and large infrastructure projects. Their flexibility, redundancy, and reliability make them ideal for environments where continuous power supply and operational safety are critical.
This guide gives international buyers a clear understanding of what double-busbar switchgears are, how they work, what standards they should meet, and how to select the right products for your project.

What Is a Modular Double Busbar Switchgear?

A double busbar switchgear is a type of high-voltage or medium-voltage switchgear that contains two separate busbar systems. Each circuit or feeder can be connected to either busbar, allowing flexible load transfer and maintenance without interrupting the power supply.

Key Advantages

• High reliability: If one busbar fails, loads can be quickly switched to the second busbar.

• Higher operational flexibility: Easy to reorganize feeders, load balance, and perform maintenance.

• Reduced downtime: Ideal for mission-critical facilities (airports, mines, data centers, large substations).

• Modular design: Easier expansion without shutting down existing systems.

Where They Are Used

• Utility substations

• HV/MV distribution networks

• Petrochemical plants

• Mining and offshore platforms

• Industrial manufacturing

• Infrastructure projects (railways, airports, ports)

Structure and Components of Modular Double Busbar Switchgear

A typical modular double-busbar switchgear includes:

Main Components

• Two independent busbars

• Bus sectionalizers / bus coupler breakers

• Circuit breakers (vacuum or SF₆)

• Disconnectors and earthing switches

• Instrument transformers (CT, PT)

• Protection relays

• Metal-clad, fully enclosed switchgear cabinet

• Internal arc-proof design

Common Configurations

• Single breaker, two busbars

• Double breaker, double busbars (higher reliability)

• Bus coupler panel for transferring loads between busbars

International Standards to Know Before Purchasing

When buying overseas, ensure the switchgear complies with recognized global standards:

IEC Standards (Most important for international buyers)

• IEC 62271-200 – AC metal-enclosed switchgear and controlgear

• IEC 62271-100 – High-voltage AC circuit breakers

• IEC 62271-102 – Disconnectors and earthing switches

• IEC 62271-203 – Gas-insulated switchgear

• IEC 60044 / IEC 61869 – Instrument transformers

Other Standards (depending on region)

• IEEE/ANSI for North America

• GB/T (China National Standards) – useful for quality benchmarking

• EN/CE certification for European markets

Tip:
Request a full type test report from an accredited laboratory (KEMA, CESI, CTQC, etc.) to verify compliance.

Key Specifications You Should Check Before Purchasing

Different projects have different technical requirements. Make sure the supplier clearly provides:

Electrical Ratings

• Rated voltage (commonly 12kV, 24kV, 33kV)

• Rated current (630A, 1250A, 2500A, 3150A)

• Short-circuit breaking capacity (25kA / 31.5kA / 40kA)

• Short-time withstand current

• Insulation level (power frequency / lightning impulse)

Design Features

• Internal arc classification (IAC A-FL / A-FLR)

• Degree of protection (IP4X / IP5X)

• Type of switching technology:

  • Vacuum circuit breaker (VCB) – MV switchgear

  • SF₆ breaker – HV applications

• Busbar current rating & material

• Modular panel width & expansion capability

Smart Features (Optional)

• Digital protection relays

• SCADA / DCS compatibility

• Remote monitoring

• Gas or temperature monitoring sensors

Buying Tips for Overseas Customers

Here are practical checkpoints when sourcing double busbar switchgear internationally:

✔ Check the Manufacturer’s Experience

Look for suppliers with:

• At least 10+ years in MV/HV switchgear manufacturing

• Global project references

• In-house type testing capabilities

✔ Ensure the Switchgear Is Truly Modular

Modular designs allow:

• Future panel additions

• Easy replacement of parts

• Faster installation

Ask for:

• Panel layout drawings

• Busbar connection diagrams

• Expansion instructions

✔ Evaluate Internal Arc Protection

Internal arc accidents are highly dangerous.
Make sure your equipment has:

• IAC certification with test reports

• Pressure relief channels

• Arc-proof doors

✔ Confirm Packaging & Shipment Details

For overseas buyers, look for:

• Export-grade wooden crate packaging

• Moisture-proof & shock-proof packing

• Clear panel numbering & cable labels

• Marine shipment protection

✔ Check After-Sales Support

Good suppliers provide:

• Online or on-site installation guidance

• Spare parts lists

• 1–3 year warranty

• Technical documentation in English

Why Modular Double Busbar Switchgear Is a Better Investment

Compared with single busbar systems, double busbar switchgears offer:

For large projects where power interruption would cause major financial loss, a double-busbar system pays for itself quickly.

Modular Double Busbar Switchgears are a smart investment for any project that demands continuous, safe, and flexible power distribution. Overseas buyers should prioritize standards compliance, modular design, safety certifications, and supplier experience when evaluating switchgear manufacturers.