Braided Copper Shunts & Flexible Copper Shunts -

Carsai manufactures custom braided copper shunt products for transformers, welding equipment, switchgear, batteries, rectifiers, generators and other high-current electrical systems.

A braided shunt is made from fine copper wires woven into a flexible conductor. The ends are compressed, welded, brazed or attached to solid copper terminals, allowing the finished component to carry current while accommodating vibration, thermal expansion and minor terminal misalignment.

We manufacture each flexible copper shunt according to customer drawings, samples and operating requirements. Available customization includes:

Bare or tinned copper braid
Custom copper cross-section
Braid width and thickness
Flexible-section length
Overall shunt length
Solid copper terminal plates
Straight, bent or offset ends
Customized mounting holes
Tin-, nickel- or silver-plated surfaces
Optional insulation
Prototype and production quantities

Send us the operating current, flexible-section dimensions, terminal contact area, mounting-hole pattern and quantity for a project-specific quotation.

For our complete range of braid rolls, connectors, jumpers and busbars, visit our Copper Braid Manufacturer page.

What Is a Braided Copper Shunt?

A braided copper shunt is a short, flexible electrical conductor used to connect two high-current terminals or conductive components.

A typical construction includes:

A flat braided copper conductor
A flexible central section
Consolidated or attached terminal ends
One or more mounting holes
Optional bends or offsets
Optional plating or insulation

The woven copper section provides greater flexibility than a solid copper bar. It can absorb limited movement without transferring excessive mechanical stress to the connected equipment.

Common applications include:

Transformer terminal connections
Welding-machine current paths
Circuit breaker connections
Generator output connections
Battery and energy storage systems
Industrial rectifiers
Switchgear and switchboards
Busduct interfaces
High-current power supplies

The term braided shunt normally emphasizes the woven flexible conductor, while copper shunt is a broader term that can refer to several different copper connection products.

Flexible Power Shunts Versus Current-Sensing Shunts

The word “shunt” can describe two different electrical products.

A flexible power shunt carries current between two terminals and absorbs movement or vibration. This is the type of product covered on this page.

A precision current-sensing shunt is designed to produce a controlled voltage drop for current measurement. It commonly uses a specified resistance alloy and requires calibrated resistance performance.

Carsai’s braided and flexible shunts are primarily custom current-carrying connectors. When a project requires a calibrated sensing function, the required resistance material, resistance value, tolerance and testing method must be clearly specified.

This distinction is important when sending an inquiry for a copper shunt connector or busbar shunt.

Different Names Used for Flexible Copper Shunts

International buyers use several descriptions for closely related products.

Common names include:

copper flexible shunt
flexible copper shunt
flexible copper shunts
flexible shunt
flexible shunts
flex shunts
copper braided shunt
braided copper shunts
copper braided flexible shunts
flexible braid shunt
flat braided shunt
braid shunt
shunt straps

Products intended for the main current path may also be called a braided power shunt or, in plural, braided power shunts.

Search phrases such as shunt copper are less natural in English, but they usually indicate the same requirement for a copper current-carrying connector.

The actual construction should always be confirmed from the drawing because these names may refer to bare braid, flattened braid ends or a complete assembly with solid terminals.

Braided Shunt Construction

The performance of a braided shunt depends on both the woven conductor and its terminal areas.

Important braid variables include:

Copper-wire diameter
Number of copper wires
Number of braid carriers
Braid density
Braid width
Braid thickness
Actual copper cross-section
Copper temper
Flexible-section length
Bare or plated finish

Fine copper wires generally provide greater flexibility than larger wires.

However, the braid must contain enough copper to carry the operating current without excessive temperature rise. Two shunts with the same visible width may have different current capacities because their copper cross-sections and braid densities differ.

For this reason, braid width alone should not be used to select a shunt.

Flat Braided Copper Shunts

A flat braided shunt provides a low-profile connection between flat busbars, terminal palms and equipment connection pads.

Its flat structure can offer:

Compact installation
Broad terminal contact areas
Easy routing between busbars
High flexibility
Controlled overall dimensions
Convenient connection to bolted terminals

A flat braided shunt may use flattened braid ends or separate solid copper plates.

Solid terminal plates are useful when the equipment requires:

Multiple mounting holes
Large contact surfaces
Bent terminal geometry
Greater terminal rigidity
Precisely controlled hole spacing

The terminal plates can be wider than the flexible braid when more mounting area is required.

Copper Welded Shunts

A copper welded shunt uses welding to consolidate the braid ends or attach the flexible conductor to solid copper terminals.

Depending on the design, welding may be used to:

Consolidate loose braid wires
Attach copper terminal plates
Join several braid sections
Produce a stable electrical transition
Create a terminal area suitable for drilling

The selected welding method must provide reliable electrical contact without unnecessarily damaging or hardening the flexible braid.

The transition from the welded terminal to the flexible section should be smooth. If the braid is forced to bend directly at a rigid welded boundary, repeated movement may concentrate stress and reduce service life.

Other terminal-production methods may include compression, brazing, crimping or attaching separate copper lugs.

Braided Power Shunts for High-Current Equipment

Braided power shunts connect high-current electrical components while accommodating vibration and movement.

Typical installations include:

Transformers

Transformer terminals may vibrate continuously during operation.

A flexible shunt can connect the transformer to switchgear, rigid busbars or busducts while reducing mechanical forces transferred to terminal palms and bushings.

Switchgear

Flexible shunts may connect:

Circuit breakers
Disconnect switches
Contactors
Main distribution bars
Generator terminals
Rectifier outputs

They are useful where a rigid busbar would require complex bending or extremely precise alignment.

Battery systems

Flexible copper shunts can connect battery modules, contactors, fuses, disconnects and power-distribution units.

The flexible section can accommodate vibration, thermal movement and small assembly tolerances.

Generators

Generators create vibration that should not be transferred directly to rigid power-distribution conductors.

Braided shunts provide electrical continuity while helping isolate this movement.

Rectifiers and industrial power supplies

High-current rectifiers, electroplating systems and industrial DC equipment may use braided shunts between transformers, semiconductor components and output busbars.

Copper Welding Shunts

A copper welding shunt is commonly used in resistance-welding machines, welding transformers and other equipment carrying high intermittent current.

Welding applications may require the shunt to withstand:

Repeated high-current pulses
Continuous mechanical movement
Vibration
Heat generated near welding components
Rapid production cycles
Tight installation space

A welding shunt may be manufactured from several sections of copper braid connected in parallel.

Important design information includes:

Maximum welding current
Current-pulse duration
Operating cycle
Shunt length
Required movement
Terminal design
Cooling conditions
Copper cross-section
Expected production frequency

A welding shunt carrying high intermittent current should not automatically be sized in the same way as a conductor carrying continuous current.

The complete duty cycle must be considered.

Busbar Shunts and Busbar Assemblies

A busbar shunt is a flexible conductor installed between rigid busbars or between a busbar and another electrical component.

It may compensate for:

Thermal expansion
Busbar vibration
Terminal misalignment
Equipment movement
Installation tolerances

A complete busbar with shunt arrangement can combine rigid power-distribution sections with a flexible interface.

For example, a rigid copper busbar may distribute current through a cabinet while the flexible shunt connects it to a vibrating transformer or generator.

The flexible section can use:

Copper braid
Stacked copper foils
Several parallel braided straps
Braid with attached terminal plates
Bare or insulated conductors

Terminal Design

The terminal areas must carry the same current as the flexible braid.

Available terminal options include:

Flattened braid ends
Compressed copper sleeves
Welded solid copper plates
Brazed copper terminals
Single-hole palms
Two-hole terminals
Four-hole terminal plates
Slotted mounting holes
Bent or offset ends
Different terminal designs on each side

The two terminal ends do not need to be identical.

One side may connect to a wide transformer terminal with four bolts, while the other connects to a narrower rigid busbar with two mounting holes.

Important terminal details include:

Contact width
Terminal thickness
Hole diameter
Hole center distance
Surface flatness
Plating
Bolt size and quantity
Mating-terminal material
Installed orientation

An undersized or uneven terminal can cause localized heating even when the flexible braid contains enough copper.

Bare and Tinned Copper Shunts

Bare copper shunts

Bare copper offers high conductivity and may be suitable for protected indoor equipment.

Typical uses include indoor transformers, switchgear, rectifiers and industrial power supplies.

Tinned copper shunts

Tin plating can improve resistance to oxidation and environmental corrosion.

Tinned products may be selected for:

Battery systems
Outdoor equipment
Marine applications
Humid environments
Solar and energy storage equipment
Connections to tinned terminals

Tin plating may cover the braid, terminal areas or entire finished assembly according to the drawing.

Nickel and silver plating can also be evaluated for special temperature or contact requirements.

Current Capacity and Shunt Sizing

Copper shunts should not be selected by width alone.

Current capacity depends on:

Actual copper cross-section
Continuous or intermittent current
Peak current
Current duration
Duty cycle
Ambient temperature
Cooling and ventilation
Shunt length
Number of parallel braids
Terminal resistance
Allowable temperature rise
Insulation coverage

A flexible shunt used in a transformer may carry continuous current, while a welding shunt may carry short high-current pulses.

These applications require different evaluations.

For high-current systems, several identical braided shunts may be installed in parallel. Their lengths, cross-sections and terminal conditions should be consistent to support balanced current sharing.

Braided Shunt Versus Laminated Copper Shunt

Braided and laminated shunts can both provide flexible electrical connections.

Braided copper shunt

A braided product normally offers:

Greater softness
Movement in several directions
Strong vibration absorption
Suitability for repeated movement
Woven fine-wire construction

Laminated copper shunt

A laminated product normally offers:

Flat, organized geometry
Controlled bending direction
Precise layer dimensions
Stable terminal positioning
High copper density

Braided shunts are often preferred where maximum flexibility is required. Laminated shunts may be more suitable where the conductor must bend predictably in one direction.

Insulation Options

Braided shunts can be supplied bare or with protective insulation.

Available options may include:

Heat-shrink tubing
PVC sleeves
Flexible protective tubing
Partial insulation
Phase identification
Polarity marking

The terminal contact areas normally remain exposed.

The insulation must remain flexible enough for the intended movement. A thick or rigid sleeve may restrict the braid and transfer bending stress toward the terminal transition.

Manufacturing and Inspection

A typical production process includes:

Reviewing the customer drawing
Confirming copper material and cross-section
Selecting the braid construction
Braiding and flattening the conductor
Cutting the braid to length
Preparing terminal sections
Compressing, welding, brazing or attaching terminals
Drilling or punching mounting holes
Forming bends and offsets
Applying plating
Adding insulation when required
Inspecting dimensions and surfaces
Protecting terminals for shipment

Inspection may include:

Overall shunt length
Flexible-section length
Braid width and thickness
Copper cross-section
Terminal dimensions
Hole diameter and spacing
Terminal flatness
Plating coverage
Insulation position
Loose or damaged wires
Surface cleanliness

Choosing Copper Shunt Manufacturers

When comparing copper shunt manufacturers, buyers should confirm whether the supplier can manufacture the complete finished component rather than only supplying braid material.

Important capabilities include:

Custom braid cross-sections
Drawing-based terminal production
Welding or attaching copper plates
Accurate hole machining
Bare and plated finishes
Insulation options
Prototype quantities
Repeated batch production
Dimensional inspection
Export packing

The quotation should clearly distinguish between unfinished braid, cut braid and a finished shunt with terminals.

Information Needed for a Quotation

To quote custom copper shunts, please provide:

2D or 3D drawing
Continuous or intermittent current
Peak current and duration
Duty cycle
Required copper cross-section
Braid width and thickness
Overall length
Flexible-section length
Terminal width and thickness
Hole diameter and spacing
Straight, bent or offset ends
Bare or plated finish
Insulation requirement
Prototype quantity
Production quantity
Annual demand

A sample, sketch or installation photograph can also support an initial review.

Frequently Asked Questions

What is the difference between a braided shunt and a braided connector?

The products may have similar constructions. “Shunt” often emphasizes a short flexible bridge, while “connector” is a broader term for joining electrical components.

Are all copper shunts used for current measurement?

No. Many flexible copper shunts are power-carrying connectors. Precision measuring shunts require defined resistance materials and calibration specifications.

Can the two terminal ends be different?

Yes. Each end can have a different width, thickness, hole pattern, bend or mounting orientation.

Can several braided shunts be used in parallel?

Yes. Parallel shunts can be used when one conductor is impractical, provided their lengths, cross-sections and connections support balanced current sharing.

Can the complete shunt be tin plated?

Yes. The braid and terminals can be supplied tinned according to the agreed specification.

Can you manufacture welding-machine shunts?

Yes. Send the welding current, pulse duration, duty cycle, movement, dimensions and terminal design for evaluation.

Can you manufacture from a sample?

Yes. A sample can help identify the construction, but a dimensioned drawing is recommended for repeat production.

Request a Braided Copper Shunt Quotation

Carsai manufactures braided copper shunts, flexible copper shunts and welded shunt assemblies for transformers, welding machines, switchgear, batteries, generators and industrial power equipment.

Send your operating current, flexible-section dimensions, terminal contact area, mounting-hole pattern, plating, insulation and quantity.

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