Negative BusBar
The Negative BusBar is designed for high-current DC systems, including 800V EV traction systems, IGBT/SiC inverters, and DC-link assemblies. It supports ≥100% IACS conductivity, stray inductance below 10 nH, and dielectric strength above 15 kV/mm. Our China factory integrates stamping, laser welding, CNC machining, and plating, with rapid samples, mass production, and ISO 9001/IATF 16949-certified quality control.
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Product Introduction
What is a Negative BusBar?
A Negative BusBar provides a defined negative current path in DC power distribution and power electronic assemblies. The structure can be produced according to the required current rating, terminal configuration, mounting position and available installation space. For applications using a Laminated BusBar, conductor geometry and insulation layout can be configured around the electrical circuit.
Technical Specifications & Material Standards of Laminated Copper BusBar
| Parameter / Feature | Technical Standard | Specification Value | Testing / Verification Standard | Applicable Product Type |
| Conductor Grade | ASTM B187 / GB/T 5231 | C11000 ETP Copper / C10200 OFC Copper | Chemical Composition & Spectrometry Analysis | Laminated Low Inductive Bus Bar |
| Electrical Conductivity | IEC 60468 | ≥100% IACS (58.0 MS/m) | Four-Wire Kelvin Bridge Micro-Ohmmeter | Multi-Layer Composite Busbar Systems |
| Insulation & Flammability | UL 94 V-0 Rated | Polyimide (Kapton) / PET Film | Flame Resistance & Tensile Strength Test | Insulated Automotive Busbar Assemblies |
| Stray Inductance | IEC 60384 | <10 nH | Agilent LCR Meter Test @ 100kHz | High-Frequency IGBT / SiC Inverter Busbars |
| Dielectric Voltage | IEC 60243-1 | >15 kV/mm (1500V DC operating voltage) | High-Voltage Insulation Dielectric Withstand Test | High Voltage Explosion-Proof Inverter Busbars |
Application Scenarios & Industry Integration of Laminated BusBar
Subway Laminated Busbar Systems
High-current DC distribution inside traction power converters and urban rail propulsion drives.
01
IGBT Laminated Busbar Modules
Ultra-low inductance switching interconnects for SiC power modules and high-frequency inverters.
02
Laminated Busbar for Three Level Inverter
Compact power distribution for NPC/ANPC topology converters in renewable energy applications.
03
Laminated Busbar for Electric Car
High-voltage negative power return paths in 800V EV traction inverters and motor controllers.
04
High Voltage Explosion-Proof Inverter Busbar
Negative BusBar assemblies for hazardous-location industrial drives and power generation units.
05
Frequently Asked Questions about Laminated Inverter Busbars
Q: What copper grades are available for laminated busbars?
A: Laminated Copper BusBars can use C11000 ETP copper or C10200 OFC copper, selected according to conductivity, electrical load, and application requirements. Material composition can be verified by spectrometry analysis against ASTM B187 or GB/T 5231.
Q: How is stray inductance controlled in laminated busbar design?
A: Laminated Bus Bar Design reduces stray inductance by keeping positive and negative conductors closely spaced and minimizing the current-loop area. For high-frequency IGBT and SiC inverter applications, the specified stray inductance can be controlled below 10 nH, subject to the final geometry.
Q: What insulation materials are used in laminated busbars?
A: The insulation system can use Polyimide (Kapton) or PET film, with material selection based on operating temperature, voltage, thickness, and mechanical requirements. UL 94 V-0 rated insulation can be specified where flame-resistance requirements apply.
Q: Where are Negative BusBar used in high-current applications?
A: Laminated Busbars for DC Power Distribution Systems are used in traction converters, IGBT modules, three-level inverters, EV motor controllers, renewable-energy converters, and industrial drives. They provide compact high-current connections while supporting low-inductance power distribution.
Q: How are laminated busbar specifications verified?
A: Key parameters can be verified through spectrometry analysis, four-wire resistance measurement, LCR testing, insulation and dielectric withstand testing, and flame-resistance testing. The applicable inspection method is selected according to conductor material, insulation system, voltage rating, and final application.
Contact Us
Send your 2D/3D CAD files (STEP, DWG, IGES) or electrical specifications directly to our engineering department. Our technical team will return a comprehensive DFM manufacturability assessment and a factory-direct wholesale quotation within 24 hours.
Negative BusBar supports high-current DC applications with ≥100% IACS electrical conductivity, stray inductance below 10 nH, and dielectric strength above 15 kV/mm, with conductor thickness, insulation, and dimensional tolerances configurable to project requirements.
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