Switchgear

Switchgear

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Switchgear | XIAOPAI Power Equipment

Switchgear is the assembled cabinet that houses the switching, protection and control equipment for a medium-voltage circuit. It combines the circuit breaker, disconnector, current and voltage transformers, protection relay and interlocks into one factory-tested cubicle, so the site work is connection rather than assembly.

KEY SPECIFICATIONS

Standard: IEC 61439 for assemblies, with IEC 62271 series for the switching devices
Voltage class: Commonly 12 kV, 24 kV and 35 kV
Breaker options: Withdrawable vacuum circuit breaker (ZN85, VSG) or fixed type depending on duty
Rated current: 630 A to 4000 A typical on the main busbar
Protection: Numerical protection relay with overcurrent, earth fault and optional differential functions
Interlocks: Mechanical and electrical interlocking to prevent racking, earthing or access errors
Internal arc classification: IAC classified designs available for operator safety
Form of separation: Form 2b to Form 4b depending on maintenance philosophy

WHY THIS MATTERS

Factory-built switchgear compresses months of on-site assembly into a tested delivery. For a project with a tight programme or limited site labour, this is usually the deciding factor, not the price of the cubicle itself.

TYPICAL APPLICATIONS

• Industrial plant medium-voltage distribution

• Commercial building intake and sub-distribution

• Utility secondary substations

• Renewable energy collection switchgear

• Data centre and infrastructure power distribution

• Mining, marine and offshore installations

BUYING THROUGH XIAOPAI

XIAOPAI (Wenzhou Xiaopai Power Technology) runs two equipment modules, flexible packaging equipment and power transmission equipment, and works as a foreign-trade service provider and authorized distributor, not a factory. We source power equipment against your specification, then carry the export documentation, factory audit, installation supervision and after-sales that a factory-direct purchase usually leaves to you. Type test reports to IEC 60076 or GB 1094 are supplied with each transformer, and IEC 62271-100 reports with each breaker.

FAQ

Q1: Fixed or withdrawable breaker?

A1: Withdrawable is worth it where you have a maintenance window and a spare cassette, because racking a breaker out takes minutes instead of hours. Fixed type is acceptable in compact or unmanned substations with no maintenance plan.

Q2: What does IEC 61439 cover?

A2: IEC 61439 is the standard for low-voltage and assembled switchgear and controlgear assemblies. The switching devices inside are covered separately, typically by the IEC 62271 series for medium-voltage circuit breakers.

Q3: Can you integrate protection relays we already use?

A3: Yes. Send the relay make and model and we will build the cubicle around it, including wiring, CT and VT matching and interlocking logic.

RELATED GUIDES

Before you request a quotation, these related articles and standards may be useful:

 [ Vacuum Circuit Breaker Buying Guide: How to Choose the Right VCB (2026) ]

 [ Transformer Selection Guide ]

 [ Dry-Type vs Oil-Immersed Transformer: How to Choose (2026) ]

External standards:

 [ IEC 62271-100 ]