Product Profile of Tungsten Contact for Circuit Breaker

Product Profile

Tungsten Contacts for Circuit Breakers are essential electrical components that serve as the main point of current flow and interruption in a circuit breaker. These contacts are designed to withstand high temperatures and large electrical loads, making them suitable for both low and high-voltage applications.

Product Features

High Melting Point

Tungsten has a melting point of 3,422°C, making it ideal for applications that involve high temperatures and heavy electrical loads.

Excellent Arc Resistance

Tungsten Rivet is known for its superior resistance to electrical arcing, minimizing the deterioration of contact surfaces.

High Electrical Conductivity

While tungsten offers durability, the addition of copper provides excellent conductivity, ensuring minimal energy loss during operation.

Versatile Applications

Tungsten contacts are not limited to circuit breakers. They are also used in automotive systems, such as solid tungsten contact rivets for car horns, as well as in various electrical devices.

Technical Features

Material Composition

The main material used in these contacts is a tungsten-copper alloy, typically with a composition of 70-90% tungsten and 10-30% copper.
Tungsten Bimetal Contact Points are utilized to provide a balance between electrical performance and mechanical strength.

Electrical Conductivity

The copper portion of the copper tungsten contacts enhances conductivity, making the contact highly efficient in conducting electrical currents with minimal energy loss. This is essential for ensuring the breaker operates smoothly with little resistance.

Mechanical Strength

Solid tungsten contact rivets are engineered for high mechanical strength, allowing them to endure high pressure and mechanical stress in applications such as automotive systems and heavy-duty electrical equipment.

Production Process

Material Preparation	The tungsten powder is blended with copper powder in specific ratios to achieve the desired properties. Typically, powder metallurgy techniques are used for blending and preparing the alloy mix.
Compacting	The blended tungsten and copper powders are compacted into the required shape and size through high-pressure pressing. This process ensures uniform density and structural integrity in the final product.
Sintering	The compacted contacts are then sintered at high temperatures to fuse the tungsten and copper particles. Sintering results in a solid, homogenous material with enhanced strength and arc resistance. The temperature during this process is carefully controlled to achieve the best combination of properties.
Bimetal Joining	In cases where tungsten bimetal contact points are required, a secondary metal, such as copper or steel, is joined to the tungsten alloy to improve electrical conductivity or mechanical strength. This is typically done through brazing or diffusion bonding techniques.
Precision Machining	After sintering, the contacts undergo precision machining to achieve the exact dimensions and tolerances required for their specific application. This process ensures the contacts fit perfectly into circuit breakers or other electrical devices.
Inspection and Testing	Each contact is subject to rigorous quality control tests to ensure it meets electrical, mechanical, and dimensional standards. Electrical resistance, arc resistance, and mechanical strength are some of the key performance metrics tested.
Final Finishing	Finally, the contacts are polished or coated with anti-corrosive layers if necessary, ensuring that they resist environmental factors like humidity and oxidation.

Production Process of Pure Tungsten Contact

Transportation and Packaging

Protective Packaging	Each contact is individually wrapped in protective, anti-static material to prevent damage from handling and transportation. This wrapping also helps prevent oxidation during storage.
Labeling	Each package is clearly labeled with the product details, including material composition, size, and batch number, for easy identification and quality tracking.
Mode of Transport	Depending on the size and urgency of the order, transportation can be arranged via air, sea, or road freight. Air freight is typically used for urgent or small orders, while sea and road transport is preferred for bulk shipments.
Real-Time Tracking	Many suppliers offer real-time tracking services, allowing customers to monitor the progress of their shipments and estimate delivery times accurately.