CuW Arc Contact Pair (Static + Moving Set)

This product is sold as a paired set — one static arc contact plus one moving arc contact — matched in grade, dimensions, and lot. For VCB OEMs building new breakers or service companies refurbishing complete contact assemblies, ordering the pair simplifies sourcing and ensures the two halves work together cleanly.

If you only need one half (replacement of one side, in-house pairing with existing parts, etc.), order the CuW Static Arc Contact or CuW Moving Arc Contact separately. This listing exists for sourcing the matched pair as a single line item.

Specifications

Property	Value
Components	1× static + 1× moving arc contact
Material Grade	CuW70 / CuW75 / CuW80 (both halves same grade)
Tungsten Content	70, 75, or 80 wt%
Dimensions	Per drawing
Pair Tolerance	Matched to drawing; same lot for both halves
Electrical Conductivity	≥42 / 38 / 34% IACS for CuW70 / 75 / 80 per GB/T 8320-2025
Density	≥13.80 / 14.50 / 15.15 g/cm³ for CuW70 / 75 / 80
Hardness (HB)	≥175 / 195 / 220 for CuW70 / 75 / 80
Bonded Joint Strength	≥185 MPa (Cu conductive end) / ≥226 MPa (CuCrZr) per GB/T 8320-2025
Surface Treatment	As machined; silver or nickel plating optional
Working Voltage	Common MV ratings: 12 / 24 / 40.5 kV
Working Current	Application-specific; confirmed per design
Quality Documentation	Material cert per lot on request

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

Applications

• New VCB builds at 12 kV, 24 kV, and 40.5 kV requiring complete contact pair sourcing
• VI refurbishment programs replacing both halves of the contact pair at once
• Sub-suppliers building vacuum interrupter assemblies for VCB OEMs
• Single-line-item sourcing for service contracts that prefer pair-level orders

Technical Notes

The two halves of an arc contact pair work as a system. Geometry, grade, and surface finish all matter on both sides; mismatching grades between static and moving (e.g. CuW70 static + CuW80 moving) is technically possible but uncommon and rarely beneficial — the harder side wears the softer side faster than expected.

When we ship the pair, both contacts come from the same material lot. For VCB OEMs with traceability requirements, this means one material certification covers both halves of the pair. For refurbishment programs, ordering the pair ensures the replacement contacts have consistent properties on day one.

For new VCB designs, supply the drawing for both halves together; we can confirm dimensional compatibility before machining. For replacement of installed contacts, send samples of both halves if possible — minor wear-pattern asymmetry on the original parts can affect the replacement geometry.

Sourcing & OEM

Custom-machined to your pair drawing is routine. Plating, MOQ, and lead time vary by specification; contact us with the drawing or samples for a project-specific quote.