Introduction
Automotive relay silver alloy contacts handle high electrical loads, thermal cycles, and vibrations in harsh vehicle environments. Engineered with silver metal-matrix composites, they ensure reliable spark suppression and circuit activation over millions of cycles.
Technical Specifications & Material Data
|
Parameter / Feature |
Automotive Specification Range |
|
Primary Alloy Grades |
AgSnO2, AgNi, AgSnO2In2O3, AgZnO, AgCu |
|
Structural Forms |
Solid Rivets, Bi-metal Rivets, Tri-metal Contacts, Clad Buttons, Brazed Assemblies |
|
System Voltage Compatibility |
12V DC, 24V DC, 48V DC, up to 800V DC (for EV High-Voltage Contactors) |
|
Current Handling |
10A (Micro relays) to 400A+ (Main battery/starter relays) |
|
Operating Temperature |
-40 C to +125 C (Engine compartment compliant) |
|
Mechanical Tolerance |
Head diameter: +/- 0.02 mm, Shank length: +/- 0.03 mm |
|
Weldability Backing |
Pure Copper (Cu), Copper-Nickel (CuNi), Steel, or custom braze alloys |
|
Inspection Standard |
100% Automated Optical Inspection (AOI) |
Product Features
DC Arc Extinguishing: Doped AgSnO₂ formulations mitigate severe arc erosion caused by high-voltage vehicle DC loads.
Anti-Material Transfer: Resists unidirectional material migration (pip and crater effect) to maintain consistent contact geometry.
Thermal Shock Resistance: Retains structural integrity and micro-hardness under rapid under-hood thermal cycling.
Quality Assurance
Certified and audited to meet global and German automotive OEM quality management standards.
Provides full Production Part Approval Process documentation and logs material chemistry into the International Material Data System.
Enforced via inline laser measurement and automated vision sorting for zero-defect tolerance.
OEM Customization
Asymmetrical Contact Pairs: Engineering different alloy compositions for the stationary and moving contacts (e.g., AgSnO2 against AgNi) to optimize DC load performance.
Custom Backing Profiles: Specialized weld-nibs and solder-flushed backings engineered to match your specific ultrasonic or resistance welding equipment.
Rapid Automotive Prototyping: Utilizing soft tooling to deliver functional prototypes for AEC-Q200 relay validation within 10 to 14 days.
Frequently Asked Questions
Q: Why should we use AgSnO2 instead of AgNi for our window lift relays?
A: Window lift motors generate a high inductive DC load and significant inrush current when stalled. AgSnO2 provides far superior resistance to contact welding under these high-inrush conditions compared to AgNi, preventing the relay from sticking closed.
Q: Do you provide full IMDS registration for the alloys you supply?
A: Yes. Environmental compliance is critical in automotive. We register the exact chemical breakdown of your specific contacts into the IMDS database to ensure your final relay meets ELV (End of Life Vehicles) directives.
Q: What is your typical Minimum Order Quantity (MOQ) for automotive contacts?
A: Because automotive production runs require strict lot control and machine setup, our standard MOQ for custom auto contacts is 50,000 to 100,000 pieces per batch, depending on the contact size and silver content.
Q: Can you help us reduce the silver cost in our heavy-duty starter relays?
A: Absolutely. We can transition your solid silver alloy contacts into bi-metal or tri-metal composites, using copper as the base conductor. This drastically reduces precious metal weight while retaining the exact same thermal and electrical performance at the mating surface.
Q: How do you guarantee the weld strength between the silver alloy head and the copper shank on bi-metal rivets?
A: We utilize advanced cold-heading technology with an extrusion-bonding process. Furthermore, destructive shear testing and metallographic cross-section analysis are performed on every production lot to guarantee the bond exceeds automotive shear strength standards.
Q: Are your contacts suitable for 400V/800V EV high-voltage contactors?
A: Yes. We produce specialized, high-density AgSnO2 contacts with optimized oxide additives specifically formulated to withstand the extreme arc energy generated when breaking 400V to 800V DC loads in electric vehicles.
Q: What happens if a dimensional defect is found on our automated assembly line?
A: We operate under a zero-defect philosophy. If a non-conformance occurs, we provide an initial response within 24 hours, followed by a comprehensive 8D (Eight Disciplines) problem-solving report, root cause analysis, and immediate air-freight replacement of the affected lot.
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