Moving Contact Conductor

The moving contact conductor is the rod connecting an MV breaker's operating mechanism to the moving contact face. It carries the breaker's continuous current during normal operation and the arc current during opening / closing. Most designs use a pure copper conductor with a CuW or copper alloy contact face brazed at the end. The conductor sees both electrical and mechanical duty: continuous current load, plus the impact and motion of operator-driven opening and closing.

This SKU covers the conductor segment specifically. For the moving contact face (the part that mates with the static contact during closing), see CuW Moving Arc Contact. For complete moving contact sub-assemblies (conductor + contact face brazed together), specify both in your order.

Specifications

Property	Value
Material	ETP copper C11000 (default); aluminum bronze C95400 on request for high-cycle mechanical duty
Form	Cylindrical conductor (often stepped, with flange or thread)
Dimensions	Per drawing
Tolerance	Per drawing
Mechanical Interface	Bolt, weld, braze, or threaded, per drawing
Contact Face	Bare copper, silver-plated, or pre-brazed CuW tip
Conductivity	100% IACS (C11000) or 10–15% IACS (C95400 if used)
Working Voltage	Common MV ratings: 12 / 24 / 40.5 kV
Working Current	Sized per VCB design rated current

Exact certified properties for your lot are available with material documentation on request.

Applications

• Moving contact conductor in 12 / 24 / 40.5 kV vacuum circuit breakers
• Operating mechanism connection rod in MV breaker assemblies
• Conductor for sub-supply to VCB assemblers building moving contact systems
• Replacement conductors for installed breaker fleets

Technical Notes

The moving contact conductor sees two duty cycles. Electrical: continuous current during normal operation, plus arc current at the brazed-on CuW tip during opening or closing. Mechanical: impact at each operation and continuous mechanical force from the spring-loaded operating mechanism. Material choice usually goes pure copper for the conductor section (high conductivity, sufficient mechanical strength) with a CuW or bronze face at the contact end.

For VCB designs where the operating mechanism interface is a threaded or welded joint, specify the joint geometry along with the conductor drawing. Thermal expansion during fault current events can stress these joints; the joint design has to accommodate it.

For high-cycle applications where the conductor sees significant mechanical fatigue, aluminum bronze C95400 is an alternative with better fatigue resistance. The trade-off is lower conductivity; size up the cross-section to compensate.

Sourcing & OEM

Custom moving contact conductors to your drawing are routine. Specify the material, dimensions, interface conditions, and any pre-brazed contact face; contact us for a project-specific quote.