Trimetal Silver Contact For Switches
Products Description
The Trimetal Silver Contact for Switches features an Ag/Cu/Ag three-layer configuration that balances conductivity, thermal dissipation, and cost-effectiveness as an alternative to traditional solid silver contacts. The head's silver alloy layer resists arc erosion while ensuring stable contact conductivity; the middle copper layer acts as a high-thermal-conductivity, low-resistance transition medium; and the foot's silver layer guarantees secure connection and current continuity. Precision forming creates a strong metallurgical bond among all three layers, preventing silver detachment during operation. This design is ideal for moving-contact switching applications in industrial control relays, supporting high-frequency and high-current circuit switching.
Product Technical Advantages
Metallurgical Bond Strength
Utilizing a dual process of diffusion welding and pressure composite bonding, a solid solution transition layer is formed at the silver-copper interface, resulting in a bond strength higher than traditional electroplating or coating processes.
Silver Layer Uniformity Control
Using precision rolling and CNC forming, the thickness tolerance of the silver alloy layer on the Trimetallic Relay Contact is maintained within ±0.05mm.
Anti-Welding Performance
The head of the Pure Trimetal AgSnO2 Electrical Silver Contact offers strong anti-welding characteristics, making it ideal for high-current surge conditions.
Thermal Cycling Stability
The thermal expansion coefficients of the copper core and the silver alloy are closely matched, generating minimal interface stress under repeated thermal cycling and preventing delamination failure of the Electrical Tri-Metal Rivet.
Process Type and Manufacturing Flow
Cold Heading
Pre-fabricated silver alloy wire, copper wire, and silver alloy wire are sequentially fed into a multi-station cold heading machine, forming an Electrical Tri-Metal Rivet shape in one step, ensuring concentricity ≤0.05mm.
Vacuum Annealing
After forming, the Trimetal Moving Contacts undergo stress-relief annealing in a protective atmosphere to eliminate work hardening and maintain the electrical stability of each metal layer.
Surface Cleaning and Inspection
Oil stains are removed by ultrasonic cleaning, followed by inspection of the Tri-Metal Button Silver Electric Contacts' head diameter, total length, and silver layer offset using a fully automated optical sorting machine.
Batch Traceability System
Each production batch of Trimetallic Relay Contact
records the raw material furnace number, cold heading parameters, and test data, complying with ISO9001-2015 process control requirements.
Frequently Asked Questions
Why do Trimetal Silver Alloy Contacts use a three-composite structure?
Optimizing silver material usage, maintaining contact performance, improving thermal management capabilities, and reducing overall costs.
Can the silver layer thickness of the Trimetal Silver Electrical Alloy Contact be customized?
The silver layer thickness of the head and feet can be customized according to the customer's load current and operating environment.
How is the bonding strength between the three layers of Ag/Cu/Ag Tri-metal Contact Rivets guaranteed?
A solid-state composite and heat treatment process is used to achieve metallurgical bonding between the materials. The bonding strength is verified through shear and pull-out tests.
contact us
If your project involves optimizing the contact system of relays, contactors, or industrial control switches, please submit your drawings or technical parameters, and we will provide you with a matching Trimetal Silver Contact for Switches solution.
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