Copper Electrical Busbar

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of copper electrical busbar in China, specialized in providing high quality copper products with competitive price. Welcome to buy discount copper electrical busbar for sale here from our factory. Customized orders are welcome.

 

A copper electrical busbar is a solid or laminated conductive strip, typically made of C11000 ETP (Electrolytic Tough Pitch) copper with a purity of 99.9%. It serves as a central power distribution point inside switchgear, panel boards, and substations, replacing multiple cables to reduce wiring complexity and heat generation.

 

Parameter	Value
Material Grade	C11000 (also known as ETP Cu / Cu-ETP / ASTM B187)
Purity	≥99.9%
Conductivity	100% IACS (≥58 MS/m)
Standards	ASTM B187, IEC 60143, BS EN 13601, GB/T 5585
Temper	Half-hard (H02) or Hard (H04) as required
Available Length	Up to 4 meters (longer upon request)

Copper remains the global standard for high-current busbars. The table below compares copper vs. aluminum across decision-critical factors.

 

Copper vs. Aluminum Busbar – Technical Comparison

Property	Copper Busbar (C11000)	Aluminum Busbar (6061)	Why It Matters for Your Project
Electrical Conductivity (% IACS)	100% (≥58 MS/m)	~61%	Copper carries the same current with smaller cross-section – saves panel space
Thermal Conductivity (W/m·K)	~401	~235	Better heat dissipation of copper busbar – reduces hot spots in enclosed switchgear
Mechanical Strength (MPa)	200–250	~90	Resists creep and loosening over thermal cycles – fewer re-torquing events
Oxide Layer Behavior	Conductive	Non-conductive (requires grease)	Copper oxide does not increase contact resistance – more reliable long-term
Typical Lifespan	25–50+ years	15–25 years	Lower maintenance of copper busbars over the system lifetime

 

The importance of busbar shape directly affects current carrying capacity and heat dissipation. Choose based on your panel's mechanical and thermal constraints.

Flat Copper Busbar (Most Common)

Best for: High-heat-load environments (switchgear, MCCs)

Advantage: Large surface area maximizes heat dissipation of copper busbar

Typical ratio: Width : Thickness = 5:1 to 10:1

 

Rectangular & Round Edge Busbars

Best for: High-vibration applications (EV charging, marine)

Advantage: Reduced corona effect at higher voltages (>600V)

Custom-Shaped Copper Busbars

Best for: Space-constrained retrofit panels or complex power paths

Examples: L-bends, Z-bends, multi-layer laminated flexible busbars

Selection tip: For the same cross-sectional area, flat busbars vs round busbars – flat offers 15–25% better cooling, while round provides better mechanical rigidity.

 

Send us your 3D model or hand sketch, and we will analyze the best copper busbar shapes for your application and provide a free STP model for validation.

 

Many customers require copper busbars with pre-punched holes for direct bolt connection to circuit breakers, switches, or transformers. We provide copper busbar stamping and CNC machining for all custom hole patterns.

Standard Hole Options

Hole Type	Diameter Range	Tolerance	Best For
Round holes	4mm – 20mm	±0.1mm	Standard bolt connections (M4 to M20)
Slotted holes	6mm x 12mm to 10mm x 25mm	±0.15mm	Thermal expansion compensation, adjustable mounting
Counterbored holes	Custom sizes	±0.1mm	Flush mounting where bolt head must not protrude
Threaded holes	M4 – M12	6H tolerance	Direct screw attachment without nuts

Based on field data from over 200 projects, the applications of copper busbars in power distribution include:

Typical Applications by Industry and Current Range

Industry / Application	Typical Current Range	Why Copper Busbar Is Chosen
Data Center Busways & PDUs	400A – 5000A	Compact design & low heat – no cooling derating
Solar Combiner Boxes & Inverters	200A – 1600A	Corrosion resistance & high ambient temp tolerance
EV Charging Stations (DC Fast)	250A – 800A	Laminated flexible busbars for vibration & thermal cycling
Switchgear & Motor Control Centers	800A – 6300A	High current carrying capacity of copper busbar with safe creepage
Substation Grounding Grids	N/A (fault current)	Low impedance for copper busbars for grounding and bonding

 

The current carrying capacity of copper busbar is the most critical parameter for panel designers. The table below shows ampacity for bare C11000 copper busbars under standard conditions (35°C ambient, 65°C max operating temperature, AC 50/60Hz, based on IEC 61439 derating guidelines).

 

Ampacity of Flat Copper Busbar – Common Sizes

Width (mm)	Thickness (mm)	Cross-section (mm²)	Current Carrying Capacity (Amps)
20	3	60	180 A
20	5	100	250 A
25	6	150	350 A
30	5	150	370 A
30	6	180	410 A
40	5	200	460 A
40	6	240	520 A
50	5	250	550 A
50	6	300	620 A
60	6	360	720 A
60	10	600	1050 A
80	6	480	900 A
80	10	800	1350 A
100	10	1000	1600 A

This ampacity table is based on ASTM B187 and IEC 61439 standards for copper busbar used in electrical panels and switchgear. For ambient temperatures above 35°C, multiply by 0.88 (45°C) or 0.76 (55°C). For DC applications, current carrying capacity of copper busbar is approximately 5-8% higher.

 

Need a non-standard size? We provide copper busbar specifications and sizing for any cross-section up to 1200mm².

Contact us for a custom calculation

 

To enhance corrosion resistance, contact performance, and electrical safety, we offer three standard plating options plus heat shrink insulation. Tinned copper busbars for corrosion resistance are the most common choice for indoor switchgear. Proper tin plating / silver plating / nickel coating for copper busbars can extend service life by 2-3x in harsh environments. For additional protection, we also provide colored heat shrink tubing for insulation, touch-proof safety, and phase identification.

Plating & Insulation Options for Copper Busbars

Surface Treatment	Thickness / Spec	Key Benefit	Typical Application
Tin Plating	3-8 microns	Low cost, good corrosion resistance	Standard switchgear, panel boards
Silver Plating	5-15 microns	Lowest contact resistance, high conductivity	High-frequency, EV connectors, military
Nickel Plating	3-10 microns	Excellent wear resistance, high temp stability	High-temperature environments (>150°C)
Heat Shrink Tubing	1.5x – 3x shrink ratio	Electrical insulation, touch-proof safety, color-coded (red/black/blue/yellow/green)	Insulated copper busbar systems, data centers, EV battery packs

For copper busbars for grounding and bonding, tin plating is sufficient. For copper busbars for data centers and server rooms, we recommend silver plating + heat shrink tubing for lowest contact resistance and touch-proof safety. For high-voltage switchgear (＞600V), PVC or epoxy insulation is available upon request.

 

 

Test Item	Equipment	Acceptance Standard	Frequency
Conductivity	Eddy current sigmascope	≥58 MS/m (100% IACS)	Every batch
Dimensional check	CMM / calipers	±0.1mm (width/thickness), ±0.5mm (length)	100%
Hardness	Rockwell / Vickers	HV 60-85 (half-hard)	Every batch
Salt spray (corrosion)	ASTM B117 chamber	Tin-plated：≥96h no red rust	Weekly
Heat rise (ΔT)	Thermal imager + load bank	ΔT ≤ 35K at rated current	Sample basis

These tests ensure that every copper busbar installation practices requirement is met for quality consistency. Third-party testing (SGS, TÜV) is available upon request at additional cost.

 

Interleaving： Kraft paper + foam sheet between each busbar layer

Moisture protection： VCI (vapor corrosion inhibitor) film wrapped around bundles

Bundling： Steel straps on wooden pallets (heat-treated, IPPC certified)

Labeling： Material grade (C11000), PO number, dimensions, plating type, quantity

Extra protection for flexible busbars： Cardboard edge protectors + individual poly bags

Container loading： Max 24 pallets per 20GP container (approx. 18-22 tons of copper busbars).

 

Production process：

Raw material cutting – CNC shearing to ±0.1mm

Hole punching / stamping – CNC turret press (hole tolerance ±0.1mm)

Edge deburring & radius rolling – removes sharp edges

Bending / forming – CNC press brake (angle tolerance ±1°)

Plating (optional) – in-house tin/silver/nickel plating line

Final inspection – 100% dimensional + conductivity check

 

Lead times：

Order Type	Lead Time
Sample (standard size, no plating)	5-7 business days
Sample (custom size/dimensions)	7-10 business days
Production order (standard, no plating)	10-15 business days
Production order (with tin/silver plating)	15-20 business days
Flexible or laminated copper busbars for vibration-prone environments	20-25 business days

First-time customers can request one free copper busbar sample (length ≤ 300mm, standard cross-section). You only pay for shipping.

Click here to request your sample now

 

Q1：What is the minimum order quantity (MOQ) for copper busbars?

MOQ = 10 pieces for standard sizes from our die library. MOQ = 50 pieces for custom-shaped copper busbars (L-bends, Z-bends, special hole patterns). For flexible or laminated copper busbars for vibration-prone environments, MOQ = 30 pieces.

No MOQ for sample orders. We support small-batch prototypes before mass production.

 

Q2：Do you offer samples? What is your sample policy?

Yes, we offer samples for all copper busbar types.

Sample Type	Cost	Shipping	Refund Policy
Standard size (from stock)	Free	Customer pays	N/A
Custom size / plating / bending	50 USD	Customer pays	Refundable upon order of 500+ pieces

Sample lead time： 5-7 business days for standard sizes, 7-10 business days for custom sizes.

 

Q3：What are your standard copper busbar sizes?

Width：10mm to 220mm | Thickness：3mm to 30mm | Length：up to 4 meters (longer available with splice kit)

Refer to our copper busbar specifications and sizing ampacity table above for current ratings.

 

Q4：How long do copper busbars last?

Indoor, controlled environment：30-50 years. Harsh or coastal environment with tin plating：20-30 years.

This is why copper busbar longevity 25 to 50 years is a key selection criterion for utilities, data centers, and industrial facilities.

 

Q5：Can you provide stamped or bent copper busbars with holes?

Yes. We provide copper busbar stamping and CNC machining with：

Hole tolerance：±0.1mm

Bend tolerance：±1°

Maximum bending length：up to 600mm

Send your drawing in PDF, DWG, or DXF format for a quick quote.

 

Q6：Which certifications do your copper busbars carry?

RoHS and REACH compliant

CE (LVD) certified

UL file under application

Third-party test reports (SGS, TÜV) available at additional cost

Mill test certificates (MTC) are included free with every shipment.

 

Q7：Do you provide insulated copper busbars?

Yes. We offer three insulation options：

Insulation Type	Voltage Rating	Best For
Heat shrink tubing (color-coded)	Up to 15kV	Insulated copper busbar systems, data centers, EV battery packs
Epoxy powder coating	Up to 36kV	High-voltage switchgear, outdoor substations
PVC sleeving	Up to 600V	Basic touch-proof protection for low-voltage panels

For copper busbars for data centers and server rooms, we recommend silver plating + heat shrink tubing for lowest contact resistance and touch-proof safety.

 

Q8：What is the difference between C11000 and C10100 copper?

Grade	Purity	Best For
C11000 (ETP)	99.9%	Standard copper busbar used in electrical panels and switchgear – cost effective
C10100 (OFE)	99.99%	High-vacuum, extreme conductivity, or sensitive electronic applications

For 99% of busbar applications, C11000 is sufficient and recommended.

 

Q9：Do you provide copper busbars for grounding and bonding?

Yes. Copper busbars for grounding and bonding are available in standard and custom sizes. We recommend tin plating for grounding applications in humid or outdoor environments.

 

Q10：Do you provide copper busbars for solar power plants?

Yes. Copper busbars for solar power plants require high corrosion resistance for outdoor exposure. We recommend：

Tin or silver plating for corrosion protection

UV-resistant heat shrink for insulation

High ampacity ratings for DC applications (5-8% higher than AC)

 

Q11：Do you ship internationally?

Yes. We ship worldwide via sea freight, air freight, or express courier (DHL, FedEx, UPS). Typical shipping destinations include：

North America (USA, Canada, Mexico)

Europe (Germany, UK, France, Italy, Spain, Poland)

Asia (Japan, South Korea, India, Vietnam, Thailand)

Middle East (UAE, Saudi Arabia, Israel)

Australia and New Zealand

For tinned copper busbars for corrosion resistance, we add VCI film and foam interleaving to prevent oxidation during long sea shipments.

 

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