Electric Silver Contact

Our company focuses on the research, development, and production of Electric Silver Contacts, covering four series: Solid Contacts, Solid Silver Contacts, Bimetal Silver Contacts, and Trimetal Silver Contacts. These busbars meet the needs of multiple fields, such as power, new energy, and industrial equipment.

1. Solid Contacts

1.1 Product definition and core parameters
Product form: High-purity electrolytic copper (Cu≥99.99%) is used as the base material, and it is formed in one step by a cold heading process, with excellent electrical and thermal conductivity and mechanical stability.
Structural parameters:

1.2 Material Process Advantages
(1). Substrate Characteristics:
Cathode electrolytic copper (oxygen content <20ppm) is selected, with a conductivity of 58MS/m (IACS ≥99.99%), which is significantly better than brass/bronze (conductivity is only 60%-80% IACS).
Density 8.9g/cm³, melting point 1083℃, excellent high-temperature oxidation resistance (no quality change in long-term service at 150℃).

(2). Manufacturing Process:
A multi-station cold heading machine is used for forming (≤φ25mm specification), one-time forming rate >98%, surface roughness Ra ≤1.6μm, avoiding material density damage caused by cold heading.

1.3 Functional advantages
(1). Electrical performance:
Low contact resistance: The raw materials of copper come from mineral smelting, not second-hand recycled materials, to ensure the purity of the materials and effectively ensure low resistance.
Anti-electrochemical corrosion: Before packaging, all silver contacts undergo special silver contact surface passivation treatment, which helps prevent the silver contacts from being exposed to air and oxidized, and improves the resistance to electrochemical corrosion.

(2). Mechanical properties:
Head bonding strength: The one-time cold heading forming process is used to improve the bonding strength of the copper contacts after cold heading deformation; the high-temperature diffusion treatment in the later stage further strengthens the bonding strength between the contact surfaces of the copper molecules, greatly enhancing the mechanical capacity.

2. Solid Silver Contacts

2.1 Product definition and basic parameters
Material system: High-purity electrolytic silver (Ag≥99.99%) is used as the base material. Alloy elements (such as Ni, CdO, SnO₂, Cu, etc.) can be added according to the working conditions to form a composite contact material to meet the conductivity, arc resistance, and anti-welding performance in different electrical environments.

2.2 Material Technology Advantages

(1). The core performance of the pure silver substrate
Electrical conductivity and thermal conductivity: electrical conductivity 63MS/m (IACS ≥ 105%), thermal conductivity 420W/m·K, significantly better than copper (IACS 100%) and silver alloy materials, suitable for high-frequency signal transmission (attenuation < 0.5dB@1GHz).
Ductility: hardness HV 25~35 (pure silver annealing state), elongation ≥ 25%, can achieve 0.1mm ultra-thin contact processing through cold pressing (thickness tolerance ±2%).

2.3 Functional technical parameters

(1) Core indicators of electrical performance
Contact resistance: pure silver contact ≤10μΩ (1A load, DC voltage drop <10mV); AgSnO₂ contact ≤15μΩ (including surface oxide film correction factor).
Arc resistance: When the rated voltage is AC 250V, the arc duration is ≤5ms (AgNi10 material), and the arc energy is ≤0.5J/time (by GB/T 5583 test).
Anti-sulfurization ability: In an environment with an H₂S concentration of 10ppm, the contact resistance increase is <30% after 500h (passed the ASTM B809 sulfurization test).

(2) Mechanical performance parameters
Head bonding strength: The one-time cold heading process is used to improve the bonding strength of the silver contacts after cold heading deformation; the high-temperature diffusion treatment in the later stage further strengthens the bonding strength between the contact surfaces of the silver molecules, greatly enhancing the mechanical ability.

3. Bimetal Silver Contacts

3.1 Product Definition and Core Architecture
Silver alloy and copper cold forging composite contact is an electrical contact material used in electrical switches, relays, circuit breakers, and other equipment. It is made by compounding silver alloy (contact layer) and copper (base layer) through a cold forging process.

Typical structure

[Contact layer] Silver alloy (AgSnO₂/AgCdO/AgNi, etc.) thickness 0.3mm~2mm

[Base layer] Copper/copper alloy (Cu/CuNi, etc.) thickness 0.5mm~5mm

Core parameters:

3.2 Material system and performance advantages
(1). Contact material matrix

4. Trimetal Silver Contacts

4.1 What is a trimetal-composite silver contact

A triple-composite silver contact is an electrical contact composed of three layers of different metal materials, usually a silver (Ag) + base metal + silver (Ag) structure. Common structures include silver-copper-silver (Ag-Cu-Ag), silver-nickel-silver (Ag-Ni-Ag), etc. The design of the trimetal-composite structure aims to combine the excellent conductivity of silver and the cost advantage of the base metal to achieve a balance between performance and cost.

4.2 Cold Heading Process

(1). Introduction to Cold Heading Process
Cold heading is a processing technology that directly forms metal bars into specified geometric shapes at room temperature through dies and stamping pressure. The characteristics of the cold heading process of three-composite silver contacts are as follows:

(2) Brief description of the cold heading process:
Raw material preparation (composite silver strip) → Cold heading forming → Heat treatment (such as annealing) → Surface treatment → Quality inspection → Warehousing

4.3 Price and performance advantages

(1). Price advantage
Cost reduction: The middle layer uses low-priced copper or nickel, which greatly reduces the use of silver, and the cost is reduced by about 30% to 50% compared with all-silver contacts.
High material utilization rate: The material loss during cold heading is extremely low, which improves the economy.

(2). Performance advantages
Good conductivity: Both sides are pure silver layers to ensure low contact resistance and stable conductivity.
Strong arc ablation resistance: The middle layer metal can buffer arc thermal stress and extend the life of the contact.
High mechanical strength: After cold heading, it has high density, good strength, and is not easy to deform.
Strong welding adaptability: Suitable for brazing or resistance welding with a variety of substrates.

4.4 Application in industrial control relays

(1). Application background
Industrial control relays need to frequently switch on and off current and have extremely high requirements for the wear resistance, conductivity, and resistance to welding of contacts. Tri-composite silver contacts are an ideal choice.

(2). Application advantages
Improve reliability: Tri-composite silver contacts ensure long-term stable operation of relays and reduce the probability of false operation.
Extend service life: Compared with ordinary silver-nickel contacts, the electrical life of tri-composite contacts is increased by more than 30%.
Adapt to high-load environments: Suitable for controlling high-impact load devices such as motors and inverters.

(3). Common product examples
Intermediate relays (such as the JTX series)
Time relays
Contactor auxiliary contacts
Signal relays in automatic control modules

Trimetal silver contacts are gradually replacing traditional contact materials with their excellent electrical properties, processing adaptability, and economy, especially in the field of industrial control relays, playing a key role. Combined with the mass production advantages of the cold heading process, it provides cost-effective solutions for electrical component manufacturers.

1. 30 years of industry experience, accurately solving the pain points of electrical connections
Strong technical genes: The core team comes from Xiamen Hongfa Group, a global leader in relays. It has been deeply involved in the electrical industry for more than 30 years and is well-versed in the material characteristics and failure scenarios of low-voltage electrical appliances, new energy, and other fields. It can provide cost-saving and efficiency-enhancing solutions and cutting-edge technology introduction (such as cadmium-free silver contacts, and high thermal conductivity welding processes).

Full category coverage: Mainly engaged in rivet/welded silver contacts, tungsten contacts, relay cores, and other 100+ metal processing parts, adapted to low-voltage electrical appliances such as circuit breakers, relays, contactors, and emerging fields such as new energy vehicles and energy storage equipment, to meet one-stop procurement needs.

2. Global localized services, industry-leading response speed
7 overseas branches: covering Europe and the United States (Barcelona), the Middle East (Tehran), Southeast Asia (New Delhi/Port Klang), Japan, and South Korea (Tokyo), providing 24-hour localized docking, credit support, and after-sales response, eliminating communication and logistics barriers for cross-border cooperation.

Speedy delivery system: free samples are sent out in 1-2 days, new mold samples are sent out in 20-30 days (including mold development), and batch orders are delivered in 15-20 days (after payment), adapting to customers' rapid R&D and mass production needs.

3. Full industry chain capabilities, excellent quality and cost
Multi-process integration: mastering 10+ core technologies such as cold heading, stamping, welding (8 processes such as laser welding/resistance welding), CNC processing, electroplating (gold/silver/nickel plating, etc.), realizing the full process from raw materials to finished products, defective rate control <0.01% and the comprehensive cost is 10%-15% lower than that of peers.

Group scale support: New energy annual turnover of 120 million yuan, low-voltage electrical annual turnover of 80 million yuan, four major production bases (3 factories in Xiamen + 2 factories in Ningbo) with professional division of labor:
- Haicang factory: new energy stamping parts/welding parts;
- Beilun factory: silver contact components;
- Yinzhou factory: relay core stamping parts, ensuring stable production capacity and sophisticated technology.

4. Strict quality control, certification system escort
Full process compliance: Passed ISO 9001:2015, IATF 16949 automotive industry quality system, and RoHS, REACH environmental certification, from raw material screening (electrolytic copper purity ≥99.95%) to finished product testing, provide COA material report, SPC process control data, to ensure product consistency meets international standards.

5. Hard-core team and equipment lay the foundation for manufacturing
We have seven workshops: stamping, welding, mold, CNC, cold heading, electroplating, and automated assembly workshops. We master the core technology and do not outsource it. Key technical personnel account for 30% to ensure the implementation of technology and stable quality control;
Advanced equipment cluster: equipped with more than 100 precision processing equipment (such as multi-station cold heading machines, and laser welding robots), with an annual processing capacity of more than 1 billion pieces, meeting the needs of large-scale mass production and high-end customization.

Hot Tags: electric silver contact, China electric silver contact manufacturers, suppliers, factory