Medium Voltage Switchgear

Reliable Medium Voltage Switchgear for Safe and Flexible Power Distribution

Medium voltage switchgear is a critical component of electrical distribution infrastructure, enabling switching, protection, isolation, measurement, and distribution of medium-voltage power across substations, industrial facilities, commercial buildings, renewable energy projects, and utility networks.

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Product Specifications

No.	Name		Unit	Data
1	Rated Voltage		KV	3,6,10
2	Rated Current		A	630,1000,1250,1600, 2000,2500,3150
3	Rated Frequency		Hz	50
4	Rated short-circuit current(valid value)		kA	20, 25	31.5	40
5	Rated ripe stable current (peak value)		kA	20, 25	31.5	40
6	Rated dynamic stable current(peak value)		kA	40	80	100
7	Rated power frequency tolerant voltage	Inter-polar /polar to ground	kV	42
		Inter-fracture	kV	48
8	Rated lightening shock tolerance voltage	Inter-polar /polar to ground	kV	75
		Inter-fracture	kV	85
9	Rated thermal time		s	4
10	Protection degree			1P2X
11	Outline dimensions		mm	110012002650 (see the note)

Key Components of Medium Voltage Switchgear

Vacuum Circuit Breaker (VCB):

Uses vacuum for interruption. Widely used in feeders, transformer/motor protection, and bus couplers for reliable switching.

Load Break Switch:

Switches load currents under rated conditions. Used where frequent breaker operation is not required.

Disconnector / Isolator:

Provides circuit isolation as part of switching and safety arrangements—not a substitute for a circuit breaker.

Earthing Switch:

Connects circuit sections to earth for maintenance safety, with interlocks to prevent unsafe sequences.

Busbar System:

Connects functional units. Designed for rated current, short-circuit withstand, temperature rise, insulation, and layout.

Current Transformer (CT):

Supplies scaled current signals for protection, metering, and monitoring. Selected by ratio, accuracy, burden, and protection needs.

Voltage Transformer (VT/PT):

Provides voltage signals for metering, protection, and control. Ratio and accuracy specified per system.

Protection Relay:

Detects abnormalities and triggers protective actions (overcurrent, earth fault, over/under voltage, frequency, etc.). Final scheme defined by project engineer.

Medium Voltage Switchgear Safety Features

Mechanical Interlocking:

Prevents incorrect operating sequences between circuit breaker, disconnector, earthing switch, and cable access.

Electrical Interlocking:

Adds control logic between switching devices and circuits, defined per project protection and operation needs.

Shutters:

In withdrawable switchgear, shutters block access to live primary circuits when the breaker is removed.

Earthing System:

Enclosure and internal earthing ensure proper connection to the facility's protective earth.

Medium Voltage Switchgear Selection Guide

Selection Factor	Key Considerations
Rated Voltage	Determine system voltage and required equipment rated voltage.
Rated Current	Based on max continuous circuit current—depends on transformer capacity, feeder/motor load, busbar loading, future expansion, and ambient conditions.
Short-Circuit Rating	Critical parameter. Consider short-time withstand current, peak withstand current, duration, and system fault level from project short-circuit calculation.
Insulation Level	Defined by rated voltage, power-frequency and lightning impulse withstand voltage, and installation conditions. Confirm against project spec and relevant standards.
Indoor / Outdoor Installation	Indoor: Substations, industrial electrical rooms, commercial facilities, distribution rooms. Outdoor: Requires weather protection, temperature, humidity, dust, UV, enclosure rating, and condensation control.
Fixed / Withdrawable Breaker	Fixed: Simpler, more compact, lower initial cost. Withdrawable: Easier maintenance, faster replacement, clear positions, higher serviceability.

Low & Medium Voltage Switchgear manufacturers

Medium Voltage Switchgear Applications

Utility & Distribution Substations: Grid distribution, feeder protection, transformer connection, bus sectionalizing, and network control.

Industrial Power Distribution: Manufacturing, steel, chemical, mining, cement, water treatment, and large production facilities. Requires high availability, clear maintenance, and coordinated protection.

Renewable Energy: Solar PV, wind farms, battery storage, and renewable substations. Configuration coordinated with generation and grid-connection requirements.

Infrastructure Projects: Rail systems, airports, ports, water infrastructure, transportation facilities, and large public facilities.

Mining & Heavy Industry: Switching and protection for crushers, pumps, fans, conveyors, mills, compressors, and large motors.

Controlled Manufacturing from Enclosure to Final Assembly

Production Process:
Engineering Review → Material & Component Preparation → Sheet Metal Fabrication → Enclosure Assembly → Busbar Processing & Installation → Primary Component Installation → Secondary Wiring → Interlocking Assembly → Protection & Control Installation → Electrical Inspection → Routine Testing → Final Inspection → Packing & Shipment

Quality Control & Testing

Incoming Component Inspection:

Critical electrical components are checked against approved specifications.

Dimensional Inspection:

Enclosure dimensions, panel interfaces, and assembly tolerances are verified.

Busbar Inspection:

Checks correct configuration, connection integrity, insulation clearances, and joint condition.

Wiring Inspection:

Secondary wiring is verified against approved circuit diagrams.

Interlock Testing:

Mechanical and electrical interlocks are tested per approved design.

Electrical Testing:

Routine tests include main circuit resistance, insulation, control circuits, protection/control functions, mechanical operation, and interlocking. Test scope follows applicable standards and project specifications.

Company Strength

Founded in March 2000, Worldwide Electric Group is a leading high-tech enterprise in China's electrical industry. Headquartered in Xiangyang City, Hubei Province, our 200,000+ m² facility houses specialized workshops for electrical assembly, mechanical processing, and photoelectric products. With a total investment of USD 100 million, we are a key player in motor control and power-saving solutions.

Medium Voltage Metal Enclosed Switchgear manufacturers

Packaging & Shipping

Medium voltage switchgear requires reinforced export packaging because panels can be large, heavy and sensitive to moisture and impact.

Packaging Options

Export Wooden Cases: Suitable for complete switchgear panels and long-distance international transportation.

Reinforced Pallet Packaging: Suitable for appropriately configured panel shipments.

Moisture Protection: Protective measures can be applied for sea freight and humid transportation environments.

Component Protection: Sensitive electrical components, meters, relays and accessories are protected against impact and contamination.

Shipping Methods

Sea Freight: Recommended for complete switchgear lineups and large project shipments.

Rail Freight: Available for selected international routes and suitable cargo requirements.

Air Freight: Possible for urgent components, replacement parts and selected smaller shipments.

Truck / Multimodal Transportation: Available depending on the destination and project logistics.

Standards & Compliance

Medium voltage switchgear projects should be specified according to the applicable electrical standards and local requirements.

ISO9001

CE Declaration

IEC 62271-1

IEC 62271-100

IEC 62271-200

IEC 60529

FAQ

Q: What is medium voltage switchgear used for?

A: Medium voltage switchgear is used to switch, protect, isolate and distribute electrical power in medium-voltage networks.

Q: What is the difference between AIS and GIS?

A: AIS — Air-Insulated Switchgear uses air as the primary insulation medium.GIS — Gas-Insulated Switchgear uses an insulating gas or gas mixture within sealed compartments.

Q: Do you supply vacuum circuit breaker switchgear?

A: Vacuum circuit breaker configurations can be provided where applicable.The appropriate circuit breaker rating and configuration depend on the project voltage, current, short-circuit level and protection requirements.

Q: Do you provide switchgear drawings?

A: For engineered projects, technical drawings can be provided according to the agreed project scope.

Q: Do you provide FAT?

A: Factory testing or customer inspection can be arranged where required by the project.The FAT scope should be agreed before production and can be based on the applicable standard and approved inspection plan.

Q: Can you provide type-test reports?

A: Applicable type-test documentation can be provided where available for the relevant product configuration.The report should correspond to the applicable equipment design and rating.

Q: What is the typical lead time?

A: For standard configurations, a typical production lead time may be 5–10 working days after technical confirmation and advance payment.For engineered projects involving customized panel arrangements, special protection systems, type-test requirements or large quantities, lead time is typically 15–30 working days.

Q: What is the MOQ?

A: For project-based medium voltage switchgear, orders are normally quoted by panel, functional unit or complete lineup, rather than by a conventional consumer-product MOQ.

Q: What payment terms do you accept?

A: For international orders, T/T bank transfer is commonly used.A typical commercial arrangement may be:
30% advance payment → production
70% balance → before shipment

Q: How long does a switchgear quotation take?

A: For a standard configuration with complete technical information, a preliminary quotation can typically be prepared within 1 business day.Complex projects require additional engineering review before a complete technical and commercial proposal can be issued.

As one of the most professional medium voltage switchgear manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy advanced medium voltage switchgear at competitive price from our factory.