Flexible Busbar Connectors, Joints, Links & Jumpers
Carsai manufactures custom flexible busbar connector products for transformers, switchgear, busducts, battery systems, inverters, generators and other high-current electrical equipment.
A flexible connector creates a reliable electrical path while allowing limited movement between two terminals or rigid busbars. It can absorb vibration, thermal expansion, assembly tolerances and minor misalignment that might otherwise place excessive stress on a solid conductor.
Depending on the construction and application, the same component may be called a flexible bus bar connector, flexible link, flexible joint, jumper or flexible copper connection.
We manufacture multilayer copper foil connectors, braided copper links, flexible aluminum conductors and insulated assemblies according to customer drawings. The conductor size, flexible length, terminal shape, hole pattern, plating and insulation can all be customized.
For a complete overview of available conductor types, visit our Flexible Busbar Manufacturer page.
What Is a Flexible Busbar Connection?
A flexible busbar connection joins two conductive components while permitting controlled mechanical movement.
The connected parts may include:
- Rigid copper or aluminum busbars
- Transformer terminals
- Circuit breakers
- Disconnect switches
- Contactors
- Battery modules
- Busduct sections
- Inverter terminals
- Power-conversion modules
- Generator outputs
Unlike a cable assembly, a flexible busbar normally has flat terminal areas that mount directly against a busbar or equipment terminal. This provides a large contact surface and eliminates the need for separate cable lugs.
The main benefits include:
- Reduced mechanical stress on equipment terminals
- Compensation for thermal expansion
- Vibration absorption
- Easier assembly when terminals are slightly misaligned
- Compact routing inside electrical cabinets
- Large electrical contact areas
- Customized terminal shapes and hole patterns
The most suitable construction depends on the required movement. A multilayer foil connector provides controlled bending in a defined direction, while a braided connector is softer and can move more freely.
Connector, Joint, Link or Jumper: What Is the Difference?
The terms used by equipment manufacturers are not always consistent.
A flexible busbar joint usually describes a connection between two busbar sections. The phrase busbar flexible joint may be used when the component also compensates for expansion or alignment differences.
A flexible busbar link normally connects a rigid busbar to another component. Buyers may also call it a busbar flexible link, flexible link busbar or copper flexible link.
Some RFQs use less natural word orders such as flexible link copper, but they normally refer to a copper flexible conductor used between two electrical terminals.
A flexible busbar jumper bridges two nearby terminals or conductive sections. Related purchasing terms include:
- busbar jumper
- copper busbar jumper
- jumper bus bar
- busbar jumpers
- bus bar jumpers
A connector is the broadest term. Searches such as busbar flexible connector, busbar flexible connectors, flexible bus connector and flexible busbar connectors generally refer to the same custom product family.
The exact product name matters less than the drawing, operating current, required movement and terminal layout.
Flexible Copper Busbar Connector Construction
A flexible copper busbar connector can be made from stacked copper foils, thin copper laminations or braided copper wire.
Multilayer copper foil connectors
Several thin copper layers are stacked together. The terminal areas are compressed, welded, brazed or otherwise consolidated, while the center remains flexible.
This construction offers:
- High electrical conductivity
- Flat and compact geometry
- Controlled bending direction
- Precise terminal positioning
- Large mounting surfaces
- Customizable layer thickness and quantity
A multilayer copper flexible link is often selected for transformers, switchgear, rectifiers and busduct interfaces.
The individual copper layers can be adjusted according to the required balance between flexibility and current capacity. More thin layers generally create a softer flexible section, while fewer thick layers produce a stiffer connector.
Braided copper connectors
Braided connectors are made from woven copper wires and provide greater softness than most multilayer foil designs.
They are suitable for:
- Continuous vibration
- Repeated movement
- Movement in several directions
- Greater terminal misalignment
- Equipment with mechanical shock
Braided connectors can be supplied with pressed terminals, welded copper plates or custom lugs. They may be manufactured from bare or tinned copper according to the operating environment.
Aluminum flexible connectors
Aluminum can reduce conductor weight and material cost in suitable systems.
Because aluminum has lower conductivity than copper, it normally requires a larger cross-section to carry a similar current with a comparable temperature rise.
Copper-to-aluminum interfaces must be designed carefully to control oxidation, galvanic corrosion and long-term contact resistance.
Flexible Copper Links and Jumper Connectors
A copper flex link is a short flexible conductor installed between two high-current terminals. Multiple units may be described as copper flex links or flexible bus links.
The terminal ends can be identical or completely different. One end may connect to a four-hole transformer terminal, while the other connects to a narrower busbar with two mounting holes.
A flexible copper jumper connector may include:
- Straight terminal pads
- Bent or offset ends
- One-hole or multi-hole terminals
- Round or slotted holes
- Wider contact areas
- Attached copper terminal plates
- Tinned contact surfaces
- Partial or complete insulation
Buyers may also use the terms copper flexible jumper, cu flexible jumper or the less natural phrase flexible jumper copper.
These descriptions normally refer to a short custom conductor that bridges two electrical points while allowing limited movement.
Three-Phase Busbar Jumpers
A busbar jumper 3 phase assembly connects corresponding phases between breakers, switches, transformers or distribution bars.
The project may use three separate jumpers or one organized assembly with clear phase identification.
Custom three-phase busbar jumpers can include:
- Equal or different phase lengths
- Red, yellow and blue insulation
- Bent or offset terminals
- Different hole patterns at each end
- Copper or aluminum conductors
- Tin-, nickel- or silver-plated terminals
- Individual part numbers
- Phase identification markings
Each phase must maintain the required electrical clearance and creepage distance.
The conductor cross-section should be based on the actual operating current, temperature rise and installation conditions. Phase spacing, short-circuit forces and mounting support must also be reviewed.
Flexible Bonding and Grounding Jumpers
Not every flexible connection carries the main operating current. Some products provide grounding, bonding or equipotential connections.
A flexible bonding jumper connects two conductive parts so they remain at the same electrical potential despite vibration or movement.
A flexible copper bonding jumper may be used across:
- Electrical enclosure doors
- Removable panels
- Machine frames
- Busbar supports
- Moving assemblies
- Cabinet sections
- Equipment covers
A flexible grounding jumper connects equipment to a grounding point. A flexible earth link is a closely related term used in many international markets.
These products may use flat copper braid, tinned copper braid or multilayer copper.
Their design should consider:
- Fault-current requirements
- Conductor length and cross-section
- Mechanical movement
- Terminal-hole dimensions
- Corrosion exposure
- Indoor or outdoor installation
- Required grounding standards
A grounding or bonding jumper should not be selected only by physical appearance. It must provide sufficient fault-current capacity and reliable terminal contact.
Flexible Copper Connections for Industrial Equipment
Custom flexible copper connections are used wherever rigid conductors would transfer excessive mechanical stress.
Transformers
Flexible links connect transformer terminals to busducts, switchgear or rigid busbars.
They help absorb vibration and compensate for small differences in terminal position.
Switchgear and switchboards
A flexible connector may join circuit breakers, disconnect switches, contactors and main distribution bars.
It is particularly useful where connected components have different heights or where assembly tolerances make a rigid bar difficult to install.
Battery systems
Flexible connectors can join:
- Battery modules
- Contactors
- Fuses
- Disconnect switches
- Current sensors
- Output terminals
- Power-distribution units
They help reduce stress caused by vibration, cell expansion and thermal movement.
Inverters and power converters
Compact flexible copper connectors can connect capacitors, IGBT modules, inductors and external terminals where installation space is limited.
Generators and rotating equipment
Flexible links help isolate vibration between a generator output and the rigid power-distribution system.
Busduct and busway systems
Flexible joints accommodate movement at equipment interfaces or thermal-expansion points.
L-Shaped and Custom Busbar Geometry
An l shaped busbar may be required when two connection surfaces are perpendicular or located at different heights.
A flexible section can be incorporated into an L-shaped, Z-shaped or offset conductor. This reduces the number of rigid bends and allows limited adjustment during installation.
Custom geometry can include:
- 90-degree terminal orientation
- Opposing terminal faces
- Stepped or offset ends
- Unequal terminal widths
- Different conductor widths along the part
- Multiple parallel flexible sections
- Attached rigid copper extensions
- One rigid end and one flexible terminal section
The drawing should clearly show the installed orientation because a multilayer connector normally bends most easily in a particular direction.
Material Options
Most high-current flexible connectors are manufactured from copper because of its conductivity, compact cross-section and reliable terminal performance.
Common copper grades include:
- C11000 copper
- Cu-ETP copper
- T2 copper
- Oxygen-free copper for special applications
Aluminum conductors and bimetallic transition designs can also be evaluated.
The material selection should consider:
- Continuous current
- Installation space
- Equipment weight
- Mating-terminal material
- Operating temperature
- Environmental exposure
- Required flexibility
- Project cost
Plating and Insulation Options
Available terminal finishes may include:
- Bare copper
- Tin plating
- Nickel plating
- Silver plating
- Selective plating on terminal contact areas
Tin plating is widely used because it improves corrosion resistance and provides a stable contact surface for many industrial applications.
Insulation options can include:
- Heat-shrink tubing
- PVC sleeves
- Epoxy coating
- Powder coating
- Custom protective covers
- Partial insulation with exposed terminals
The selected insulation must allow the flexible section to move as intended. Terminal contact surfaces should remain clean and exposed.
Current Capacity and Terminal Design
A connector cannot be sized from current alone.
The required conductor cross-section depends on:
- Continuous current
- Peak current
- Short-circuit current
- Ambient temperature
- Cooling and ventilation
- Allowable temperature rise
- Conductor length
- Duty cycle
- Copper or aluminum grade
- Terminal contact resistance
- Enclosed or open installation
Terminal design is equally important.
An undersized terminal pad, poor flatness or incorrect bolt pressure can create localized heating even when the flexible conductor contains enough copper.
Customers should specify:
- Terminal width
- Terminal thickness
- Hole diameter
- Hole center distance
- Mating-terminal material
- Bolt quantity
- Bolt size
- Required mounting direction
The terminal and flexible conductor should be designed as one complete electrical connection.
Flexible Copper Connection Manufacturing
A typical flexible copper connection production process includes:
- Reviewing the drawing and application
- Confirming conductor material and cross-section
- Cutting copper foils, strips or braid
- Stacking or preparing the flexible section
- Compressing, welding or attaching terminal ends
- Punching, drilling or machining holes
- Forming bends and offsets
- Deburring and cleaning
- Applying plating
- Adding insulation
- Inspecting dimensions and surfaces
- Protecting terminals for shipment
Inspection can cover:
- Overall length
- Flexible-section length
- Width and total thickness
- Hole size and spacing
- Terminal flatness
- Bend angle
- Plating coverage
- Insulation location
- Surface cleanliness
- Part marking
Information Needed for a Quotation
To quote a flexible connector, joint, link or jumper, please provide:
- 2D or 3D drawing
- Connection layout
- Copper or aluminum grade
- Continuous current
- Peak or short-circuit current
- Required flexibility or movement
- Overall dimensions
- Flexible-section dimensions
- Terminal width and thickness
- Hole diameter and spacing
- Bend or offset details
- Plating requirement
- Insulation requirement
- Order quantity
- Annual demand
If the final drawing is unavailable, we can initially review a sketch, sample or installation photo.
Frequently Asked Questions
Can the two terminals have different shapes?
Yes. Each end can have a different width, hole pattern, bend, offset or plating area.
What is the difference between a flexible joint and a flexible jumper?
A joint usually connects two busbar sections, while a jumper bridges two nearby terminals. In practice, the names often overlap.
Can you manufacture a connector from a sample?
Yes. A sample can help confirm the structure, but a dimensioned drawing is recommended for production control.
Are flexible connectors available with insulation?
Yes. Heat-shrink, PVC, epoxy, powder coating and custom covers can be applied while leaving contact areas exposed.
Can the connector be used for grounding?
Yes. A flexible earth or grounding link can be designed according to the required fault current, dimensions and operating environment.
Can you produce prototypes?
Prototype and small-batch production can be evaluated before regular-volume manufacturing.
Request a Flexible Busbar Connector Quotation
Carsai manufactures custom flexible busbar joints, links, jumpers and connectors for transformers, busducts, batteries, switchgear and industrial power systems.
Send your connection layout, current, material, required flexibility, terminal dimensions, hole pattern, plating, insulation and quantity.
