Laminated Busbar

Product Profile
The laminated busbar is applied to connect the power devices of the electrical and electronic product. It reduces the distributed inductance of the circuit by means of the structural style of the lamination and parallel distribution of the anode and cathode. In this way, the voltage surge is reduced when the power component is turned off. Therefore, this product lowers the requirement for the voltage resistance of the power component, improves the reliability and stability of the operation of the component and meanwhile enhances the integration level of the current circuit. Last but not least, it is convenient for maintenance.
This laminated Busbar could be customized or specified according to your design or drawings. Clients can also provide information of real application information for us and we can design products on the basis of such information.

1. Low inductance coefficient
2. Compact Structure and effective use of space and control of the system temperature
3. Minimal impedance and voltage drop
4. Strong overload capacity
5. Reduction of the harms caused by peak voltage to the components and extension of the service life of the electronic components
6. Reduction of the system noise and the electromagnetic interference/radio frequency interference
7. Easy installation and convenient on-site maintenance
8. Fewer components and improvement of the system reliability
9. Equally distributed capacitance
10. Simplicity and beauty in appearance

Product Parameters
Item Description
Operating voltage range 0~20kV
Rated current range 0~3600A
Product structure Hot pressing edge sealed, hot pressing edge open, hot pressing edge with potting
Max. size 1600×800mm
Flame rating UL94 V-0
Conductor material T2 Cu 、 1060 AL
Conductor surface treatment Passivation, tin plated, nickel plated or silver plated
Connection with the device Embossing, riveted bronze columns, welded copper columns
Insulation resistance 20MΩ ~ ∞
Partial discharge <10PC
Temperature rise 0 ~ 40K
Testing and Validation Capabilities
Item   Capability of Test  Test Equipment  Reference Standard  Type of Test
Factory Examination Type Test Reliability Testing
Appearance Yes Non / *    
Product Size Yes 2.5D Optical Instrument / * *  
Insulation Resistance Yes Insulating Dielectric Strength Tester GB/T 24343-2009 6 * *  
Dielectric Strength Yes Insulating Dielectric Strength Tester GB/T 24344-2009 5.4 * *  
Partial Discharge Yes Partial Discharge Tester GB/T 16935.1-2008 * *  
Temperature Rise Test Yes Programmable Frequency Converter / * *  
Distributed Inductance Test Yes Inductance Detector /   *  
Distributed Capacitance Test Yes Digital Electrical Bridge /   *  
Fastness Test Yes Electronic Universal Testing Machine /   *  
Torsion Test Yes Torque Wrench /   *  
Combustion Test Outsourcing Test   UL 94   *  
Low Temperature Test Yes Constant Temperature and Moisture Test Chamber GB2423.01 2001     *
High-temperature Test Yes Constant Temperature and Moisture Test Chamber GB2423.02 2001     *
Damp Heat Test Yes Constant Temperature and Moisture Test Chamber GB2423.3 2006     *
High-low Temperature Cycling Test Yes Constant Temperature and Moisture Test Chamber GB2423     *
Salt Spray Test Yes Salt Spray Test Chamber GB2423.18-2000     *
Peel Strength Test Outsourcing Test / GB/T 2790-1995     *

Selection of Insulation Materials
The low inductance of the laminated busbar could be ensured by using excellent insulating materials. In order to meet a series of requirements for the electric insulation or environment, customer could make an optimal option on the basis of actual application environment.

Material and Performance Density
(g/cm³ )
Thermal Expansion
Continuous Use
NOMEX 0.8~1.1   0.143 1.6 9 94 V-0 220  

1.42 20 0.094 3.5 9 94 V-0 220 0.24
Polyvinyl Fluoride

1.38 53 0.126 10.4 19.7 94 V-0 105 0
Polyester Film

1.38~1.41 60 0.128 3.3 25.6 94 V-0 120 0.1~0.2
Characteristics of the Insulation Material
NOMEX Polyvinyl Fluoride Polyester Film Polyimide
Excellent fire resistance and heat resistance;
good chemical resistance;
Favorable Mechanical Performance; Radiation resistance
Excellent electrical performance and steady chemical property;
Low hygroscopicity and flame resistance.
Good electrical performance and chemical corrosion resistance;
Low hygroscopicity and economical price.
Favorable heat resistance,
excellent electrical
performance; Radiation
resistance and flame

Simulation Picture of the Laminated Busbar

  • Traditional Copper Bar Current Distribution Ls=73.4nH
  • Bus Bar Current Distribution Ls=10.6nH

Relationship between the Inductance of the Busbar and the Thickness of the Layer Insulation Material of the Busbar

Range of Application
Power Electronics Industrial inverter, inverters, wind power, UPS systems
high density power distribution cabinets, electric
welding machines, test equipment, large server and medical equipment
Transportation Electric locomotives, Railway trains, electromobile
Electrically driven ships
Aerospace and space Satellite systems, Airliner, Space Shuttle, Missile systems
Military Submarines, Communication systems, Armored
vehicles Radar systems
Communication IT servers, super computers
Connection Advantage Disadvantage Cost
Embossing Good performance, high reliability Technological limitations Low
Riveted bronze columns Easy to make and it can meet all kinds of design requirements Moderate mechanical performance, it is not suitable for harsh working conditions Moderate
Tin-brazed copper columns Good mechanical performance, wide application range / High
Silver-brazed copper columns Compared with tin-brazing, it has lower resistance and higher temperature resistance High cost Higher
Treatment Scheme of Busbar Terminal Connection Stress
Solution Advantage Disadvantage Cost
Slot Easy to make, moderate cushioning effect Lower electric performance Low
Local terminal heat treatment Easy to make, good cushioning performance If contact area is large, contact resistance will be increased and electrical performance will be decreased Moderate
Copper woven belt connection Good cushioning performance, the assembly deviation has compensated The terminal is longer and the stray inductance has increased High
Soft joint with copper foil Good cushioning performance, the assembly unidirectional deviation has compensated The terminal is longer and the stray inductance has increased Highest
Markets & Applications
Dimensions 1107x176(mm)
Conductor layers 2
Rated voltage 1300VDC
Rated current 670A
Min. current density 2.1A /mm~2
Application fields Wind Power
Packaging forms Hot pressing edge-sealed
Product features Local high current of terminals and low cost for embossing
Dimensions 450x418(mm)
Conductor layers 2
Rated voltage 1000VDC
Rated current 600A
Min. current density 2.6A /mm~2
Application fields Photovoltaic power generation
Packaging forms Hot pressing edge-sealed
Product features Different installation surfaces for components; high space utilization rate; one-time lamination of Z-shape
Dimensions 2400x240(mm)
Conductor layers 2
Rated voltage 1200VDC
Rated current 2500A
Min. current density 1.67A /mm~2
Application fields Ship
Packaging forms Hot pressing edge with potting
Product features Super long and super thick; the soft connection is designed to eliminate vibration stress; triple mechanical reinforcement through hot pressing, edge sealed and screws
Dimensions 620x510(mm)
Conductor layers 2
Rated voltage 1000VDC
Rated current 600A
Min. current density 1.6A /mm~2
Application fields Photovoltaic power generation
Packaging forms Hot pressing edge-sealed for capacitor modules
Product features Busbar and capacitors constitute the modules, which have higher comprehensive performance and lower overall cost
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