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High-Precision Switchgear Components and Custom Sub-assemblies (12kV - 40.5kV)

Engineering-grade switchgear components manufactured for Medium and High Voltage Air-Insulated Switchgear (AIS), Gas-Insulated Switchgear (GIS), and Ring Main Units (RMUs). Built to strict IEC 62271 and IEEE C37 specifications, our components deliver low contact resistance, zero-void insulation integrity, and high mechanical endurance for global switchgear OEMs and panel builders.

Surge Protective Device
A surge protective device (SPD) limits transient overvoltages caused by lightning and switching surges, diverting surge current to earth and clamping the voltage seen by connected equipment....
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Disconnect Switch
A disconnect switch, also called an isolator, provides a visible break in a circuit so that equipment can be safely isolated for maintenance and operation. It is opened under no-load or low-load...
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Voltage Transformer
A voltage transformer (VT), also called a potential transformer, steps primary system voltage down to a standardized low secondary voltage for metering, protection relays and instruments,...
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Current Transformer
A current transformer (CT) steps down primary current to a standardized low secondary current, typically 5 A or 1 A, for metering, protection and monitoring instruments. It provides electrical...
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Residual Current Device
A residual current device (RCD) detects leakage current to earth and trips the circuit quickly to protect people against electric shock and to reduce fire risk from earth faults. It monitors the...
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Miniature Circuit Breaker
A miniature circuit breaker (MCB) is a DIN-rail mounted protective device for final circuits, providing overload and short-circuit protection for lighting, socket outlets and small equipment...
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Molded Case Circuit Breaker
A molded case circuit breaker (MCCB) is a low-voltage protective device that isolates and protects circuits against overload and short-circuit faults. The trip unit combines thermal and magnetic...
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High Voltage Vacuum Circuit Breaker
The High Voltage Vacuum Circuit Breaker is a premium product from Yuanzhuo Electrical Equipment. We designed it for high-voltage switchgear applications.
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Polymer Housed Surge Arrester
The Polymer Housed Surge Arrester is a specialized protection device from Yuanzhuo Electrical Equipment. We designed it for grid overvoltage protection. We built it with our technical expertise in...
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Surge Protection Cabinet
The Surge Protection Cabinet is a complete protection device from Yuanzhuo Electrical Equipment. We designed it for grid busbar overvoltage protection. We built it with our core technology in...
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Product Series

Primary Conduction and Contact Assemblies

Vacuum Interrupter Contacts: Oxygen-free copper (OFC) contacts with CuCr contact materials, optimized for high current arc interruption.

Tulip and Finger Contacts: Phosphor bronze and beryllium copper spring-loaded contacts featuring silver plating (15 microns or greater) to prevent oxidation and contact erosion under high-load thermal expansion.

Copper Busbars and Conductors: CNC-machined E-Cu electrical copper bars with rounded edges, silver or tin plating, and continuous current ratings up to 4000A.

Insulation Components

Epoxy Resin Contact Spouts and Bushings: APG (Automatic Pressure Gelation) molded epoxy insulators engineered for operating temperatures from -25 deg C to +120 deg C with partial discharge levels below 5 pC at 1.2 Un.

Insulating Rods and Support Structures: Glass fiber reinforced polymer (GFRP) rods providing tensile strength exceeding 800 MPa for breaker linkage drives.

Operating and Earthing Mechanisms

Earthing Switches (12-40.5kV): High-speed earthing switches with spring closing mechanisms, certified for short-circuit making capacity up to 31.5 kA / 40 kA.

Interlock Linkages and Drives: Precision steel linkages with zinc-nickel alloy surface treatment (greater than 720 hours salt spray resistance) to eliminate mechanical jamming in corrosive environments.

Specifications and Configuration

Parameter	12 kV Class	24 kV Class	40.5 kV Class	Testing Standard
Rated Voltage (Un)	12 kV	24 kV	40.5 kV	IEC 62271-1
Rated Current (In)	630A / 1250A / 2500A / 3150A	630A / 1250A / 2500A	1250A / 2000A / 3150A	IEC 62271-100
Short-time Withstand Current (Ik)	25 kA / 31.5 kA / 40 kA (3s)	20 kA / 25 kA / 31.5 kA (3s)	25 kA / 31.5 kA / 40 kA (3s)	IEC 62271-200
Power Frequency Withstand Voltage	42 kV (1 min)	65 kV (1 min)	95 kV (1 min)	IEC 60060-1
Lightning Impulse Withstand (BIL)	75 kV	125 kV	185 kV	IEC 60060-1
Partial Discharge Level	Less than or equal to 5 pC @ 1.2 Un	Less than or equal to 5 pC @ 1.2 Un	Less than or equal to 5 pC @ 1.2 Un	IEC 60270
Contact Plating Thickness	Silver 15 um - 25 um	Silver 15 um - 25 um	Silver 20 um - 30 um	ASTM B545 / ISO 4521
Mechanical Endurance	10,000 cycles (M2 class)	10,000 cycles (M2 class)	10,000 cycles (M2 class)	IEC 62271-102
Operating Temperature Range	-25 deg C to +120 deg C	-25 deg C to +120 deg C	-25 deg C to +120 deg C	IEC 62271-1

Applications

Medium Voltage Switchgear Cabinets:

KYN28A-12, KYN61-40.5, and ABB/Siemens frame-compatible retrofits and OEM assemblies.

Ring Main Units (RMU):

Gas-insulated (SF6 / Eco-gas) and solid-insulated compact distribution units for urban power grids.

Secondary Substations and Renewable Energy:

Wind turbine power distribution panels, photovoltaic collector switchgear, and modular transformer substations.

Industrial and Heavy Utilities:

Motor control centers (MCC), mining power supply units, and steel mill high-current feeder panels.

Customization and OEM Engineering Services

We manufacture non-standard switchgear components according to customer technical drawings, STEP 3D models, or sample parts.

Reverse Engineering and CAD Redesign:

Modernization of legacy switchgear parts or adaptation to custom structural dimensions.

Tooling and APG Mold Fabrication:

In-house mold building for epoxy resin spouts, embedded poles, and busbar supports, reducing setup lead time to 20 days.

Surface Coating and Material Options:

Electroless nickel, silver plating (5-30 um), tin plating, or powder coating options based on site atmospheric conditions (C3 to C5 corrosive environments).

Tolerance Control:

CNC Machining centers maintain dimensional tolerances within +/-0.02 mm on conductive interface surfaces.

Testing and Quality Control

Every manufacturing batch undergoes routine and type testing verification in accordance with ISO 9001:2015 quality frameworks and IEC specifications:

Dimensional and Plating Inspection:

CMM 3D coordinate measuring, X-ray fluorescence (XRF) plating thickness measurement, and surface roughness testing.

Electrical Testing:

Continuous loop contact resistance testing (less than or equal to 20 micro-ohms), power-frequency high-voltage dielectric testing, and high-sensitivity partial discharge analysis.

Mechanical and Material Verification:

Tensile/compression testing, Rockwell hardness checks, spectrographic raw material analysis (ICP-OES), and mechanical endurance cycling.

Thermal Stress and Environmental:

Temperature rise testing under rated continuous current and thermal shock testing for epoxy insulation (-40 deg C to +130 deg C).

Packaging, Documentation and Delivery

Protective Packaging: Vacuum sealed anti-oxidation wrapping for silver-plated conductors, shock-absorbing EPE foam inserts, and heat-treated IPPC/ISPM 15 compliant wooden cases suitable for sea and air freight.

Quality Documentation Pack (Included with Shipment):

EN 10204 3.1 Material Test Certificates (MTC)

Factory Inspection and Routine Test Reports (Dielectric, Contact Resistance, Partial Discharge)

Plating Thickness Inspection Records

Third-Party Type Test Reports (KEMA / CNAS accredited lab reports available on request)

Lead Time: 15-20 days for standard series production; 30-35 days for new tooling and initial sample approval.

FAQ

Q: What standards do your switchgear components comply with?

A: Our components meet or exceed IEC 62271-1, IEC 62271-100, IEC 62271-200, and IEEE C37 standards. All conductive and insulating materials comply with RoHS and REACH regulations, with full material traceability provided via EN 10204 3.1 certification.

Q: How do you prevent partial discharge failures in epoxy resin components?

A: We utilize Automatic Pressure Gelation (APG) technology paired with vacuum degassing during resin mixing. Every produced spout, bushing, and insulator undergoes 100% routine partial discharge testing, guaranteeing levels below 5 pC at 1.2 Un.

Q: Can you manufacture components based on custom drawings or legacy specifications?

A: Yes. We support full OEM manufacturing from DWG, STEP, or IGES files. Our engineering team conducts DFM (Design for Manufacturability) evaluations prior to production to optimize tolerances, material utilization, and surface treatment efficiency.

Q: What silver plating thickness do you apply to contact fingers and busbars?

A: Standard silver plating thickness ranges between 15 um and 25 um, depending on the rated current and operational frequency requirement. Custom plating specifications up to 40 um with anti-tarnish passivation treatment are available upon request.

Q: What is the typical lead time for custom tooling and sample validation?

A: Custom APG mold or stamping tool fabrication takes approximately 20 business days. Initial samples, along with full dimensional inspection reports and material test certificates, are shipped within 5 business days following mold completion.

Q: How are silver-plated components protected against oxidation during ocean freight shipping?

A: All silver-plated conductive parts are packaged in sealed, moisture-proof VCI (Vapor Corrosion Inhibitor) bags containing active desiccant packs. Outer packaging uses heat-sealed barrier films before placement in sturdy, export-grade wooden cases.

Request a Quote

Send us your technical drawings, material specifications, and projected order quantities for an immediate engineering review and competitive pricing quotation.

NDA Protection: Non-Disclosure Agreements (NDA) signed prior to drawing submission upon request.

Response Time: Engineering quotation delivered within 24 business hours.

Supported Files: STEP, STP, DWG, DXF, PDF.

Direct Engineering Support: Discuss technical parameters directly with our electrical application engineers.

We're well-known as one of the leading switchgear components manufacturers and suppliers in China. We warmly welcome you to wholesale high quality switchgear components at competitive price from our factory. If you have any enquiry about cooperation, please feel free to email us.

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