What is a Brass Bolt Brazed Silver Contact for Power Switch?
The Brass Bolt Brazed Silver Contact for Power Switch provides the conductive contact interface and mechanical mounting structure inside low-voltage switching equipment. The silver contact is joined to a brass bolt or base so that current can pass from the contact surface to the conductive terminal, while the bolt provides mechanical positioning and fastening.
The assembly is intended for electrical equipment operating at up to 1000 V, including air circuit breakers, circuit breakers, contactors, power switches, and related low-voltage switching mechanisms. The actual current rating, contact geometry, silver grade, brass grade, and joining parameters should be established based on the customer's electrical load, mechanical structure, and approved drawing.
The manufacturing route can incorporate resistance welding, soldering, silver brazing, or high-frequency joining, depending on the contact material, base material, geometry, and required joint performance. The existing product specification also identifies controlled laser welding and ultrasonic welding as joining technologies used for electrical contact assemblies.
Technical Specifications of Low Voltage Electrical Contacts
| Technical Parameter | Specification Value |
| Contact Material Grade | AgSnO2 or AgCdO |
| Electrical Conductivity | > 85 (Silver tip), > 28 (Brass base) |
| Shear Strength of Braze Joint | > 180 MPa |
| Contact Hardness | 80‑110 HV (Brass), 70‑100 HB (Silver alloy) |
| Contact Resistance | < 0.5 mΩ at rated clamping force |
Brazing & High‑Frequency Welding Process Features of Spot Welding Assembly
Controlled Thermal Input
High‑frequency induction brazing limits heat‑affected zones, preserving base material temper.
Void‑Free Joint Integrity
Precise alloy preform placement for Brazed Contact Assembly ensures complete wetting across the mating interface.
Automated Atmosphere Protection
Inert gas shielding for Brazing Silver Contacts to Copper Bars prevents oxidation during the critical liquidus phase.
Post‑Join Shear Testing
Destructive and non‑destructive inspection for Resistance Brazing Electrical Contacts validates bond line mechanical strength.
Frequently Asked Questions about Brazed Contact Assembly
What brazing filler metals are used for Brazing Silver Contacts to Copper Bars?
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We utilize high‑purity silver‑based filler alloys, such as B‑Ag72Cu or B‑Ag45CuZn, ensuring optimal capillary action, high thermal conductivity, and robust mechanical bonding under severe operational stress.
How is the bond strength verified in Brass Contact Welding substrates?
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Every production batch undergoes destructive shear testing and microscopic cross‑section metallographic examination to guarantee that the brazed interface exceeds minimum industrial load requirements without delamination.
Can the thread dimensions and shank length of Precision Welding for Brass Parts be customized according to proprietary drawings?
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Yes, our facility operates advanced CNC machining centers alongside automated cold heading lines, allowing full customization of thread pitches, head diameters, and overall fastener dimensions per client specifications.
Are these Brass Switch Contact Weldings suitable for high‑frequency switching operations in industrial environments?
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The dense grain structure of our silver alloy tips provides exceptional resistance to electrical arc erosion, making them highly durable for repetitive high‑frequency switching cycles in low‑voltage switchgear.
How do you prevent oxidation on the Welded Brass Terminal Assemblies during the brazing cycle?
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Specialized localized induction heating coils and controlled protective atmospheres are employed to restrict thermal exposure, preventing heavy scaling and maintaining clean, ready‑to‑assemble thread tolerances.
contact us
Please share your power‑switch contact drawings, material specifications, and annual volume requirement for our technical assessment. Our engineering team will evaluate the Brass Bolt Brazed Silver Contact for Power Switch, silver contact layout and bonding process, then confirm sampling specifications, manufacturing workflow and project quotation.
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