Tungsten Copper Moving Arcing Contact
1. What's Tungsten Copper Moving Arcing Contact?
Tungsten copper moving arcing contact is an arcing contact installed in the arc-extinguishing chamber of a high-voltage circuit breaker that moves with the operating contact assembly and withstands arc exposure during circuit opening and closing. CTIA's tungsten copper moving arcing contacts are manufactured through powder metallurgy and copper infiltration, with tungsten providing high-temperature and arc erosion resistance and copper ensuring efficient current conduction and heat dissipation, helping protect main contacts from arc damage.
2. Characteristics of CTIA's Tungsten Copper Moving Arcing Contact
(1) Arc Erosion Resistance: Tungsten phase helps reduce melting loss and material spatter caused by electrical arcs, maintaining shape of contact working face.
(2) Electrical and Thermal Conduction: Copper phase assists in conducting current and dissipating heat, reducing localized temperature rise.
(3) Control of Finger Deformation: Contact fingers experience bending stress during repeated closing and opening cycles; if plastic deformation occurs, it may cause finger spreading and contact pressure drop, affecting current conduction and operational reliability.
(4) Good Wear Resistance: Moving arcing contact makes contact and slides against fixed arcing contact during repeated opening and closing operations, prone to mechanical wear. Selecting appropriate tungsten copper material and optimizing contact structure helps reduce dimensional changes caused by wear and maintains contact fit and performance.
(5) Accurate Contact Fit: Contact profiles, finger gaps, and connection dimensions must match the circuit breaker structure to minimize excessive friction and poor electrical contact.
3. Types of CTIA's Tungsten Copper Moving Arcing Contact
(1) Finger-Type: Uses multiple cantilevered contact fingers to form the contact structure. Key dimensions include finger root dimensions, tip gaps, and contact pressure.
(2) Plug-In Type: Uses a cylindrical or plug-in structure that mates with the fixed arcing contact, requiring precise control of insertion depth and fit tolerances.
(3) Composite Type: Combines tungsten copper contact with conductive bases or other materials to balance arc erosion resistance and structural requirements.
4. Applications of CTIA's Tungsten Copper Moving Arcing Contact
(1) High- and Extra-High-Voltage SF₆ Circuit Breakers: Used as moving-side arcing contacts in circuit breakers, withstanding arc erosion during high-current interruption.
(2) Gas-Insulated Switchgear: Used as moving arcing contacts in GIS circuit breakers, meeting movement, fit, and arc erosion resistance requirements in compact structures.
(3) Capacitor Bank Switching Circuit Breakers: Withstands inrush current, prestrike arcs, and mechanical wear during closing operations, requiring consideration of both arc erosion and sliding wear.
(4) Other Switching Equipment: Used in medium- and low-voltage switching devices as tungsten copper inserts, sintered layers, or auxiliary contact structures to protect contact surfaces or provide arc initiation.
5. Specifications of CTIA's Tungsten Copper Moving Arcing Contact
(1) Common Materials: WCu30, WCu25, WCu20, WCu15, etc.
(2) Dimensions and Tolerances: Customizable.
CTIA GROUP has nearly 30 years of experience in tungsten copper alloy manufacturing, specializing in powder metallurgy and precision machining. CTIA customizes tungsten copper moving arcing contacts by selecting suitable material compositions, optimizing contact finger and mating structures, and controlling critical dimensions to meet circuit breaker requirements for arc erosion resistance, mechanical wear, and reliable contact engagement.
For any inquiry, please contact tungsten copper manufacturer: CTIA GROUP
Email: sales@chinatungsten.com
Tel: 0086 592 5129696 / 0086 592 5129595
Website: tungsten-copper.com
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