Vacuum Circuit Breaker Parts & Contacts
Direct manufacturer of high-precision replacement parts for VS1, VD4, and ZN85 breakers. Featuring Silver-plated Tulip Contacts (630A-4000A), T2 Copper Contact Arms, and Epoxy Insulating Rods.
High-Performance Vacuum Circuit Breaker Parts & Spares
XBRELE specializes in manufacturing critical conductive and insulating components for medium voltage vacuum circuit breakers (VCBs). Our catalog covers the entire current range from 630A to 5000A, offering genuine replacement parts for VS1, VD4, ZN85, and retrofit solutions for older JYN/KYN cabinets.
We prioritize conductivity and mechanical stability. Our Tulip Contacts and Static Contacts are machined from 99.9% pure T2 Copper with thick silver plating (8-12μm) to ensure low contact resistance and minimal temperature rise. For insulation, our Contact Arms and Operating Rods utilize the APG epoxy process or vulcanized silicone, providing void-free dielectric strength essential for arc extinction chambers.
Strictly tested against IEC 62271-1 (Common specs for switchgear) , our spares ensure the operational safety of your circuit breakers. From simple duckbill contacts to complex embedded poles, we deliver factory-direct precision.
For chassis trucks or interlocking mechanisms, please visit our Mechanism & Chassis Section .
Complete VCB Accessories Catalog
Select a category below to browse technical specifications and drawings.
- Standard: IEC 60694 / GB 3906
- Range: 630A (12 Sheets) – 4000A (82 Sheets)
- Material: T2 Copper + Silver Plate
- Application: Contact Box Mating
- Types: Round (φ26-63mm) & Square
- Material: 99.9% Pure Copper
- Usage: Grounding / Disconnector
- Voltage: 10kV – 35kV
- Thickness: 8mm – 10mm Standard
| Sub-Model | Specification | Note |
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Technical Superiority of XBRELE Spares
Reliable vacuum circuit breakers start with high-purity materials. We combine T2 Copper for maximum conductivity with APG Epoxy Resin for superior dielectric strength, ensuring your VCB operates safely under high-current loads (up to 4000A).
T2 Copper & Silver Plating
The performance of a tulip contact relies on low contact resistance. We use certified T2 Copper (≥99.9% purity) as the base material.
- Thick Plating: 8-12μm silver plating prevents oxidation and reduces temperature rise at the joint.
- Constant Pressure: Non-magnetic stainless steel springs maintain uniform contact pressure over thousands of cycles.
- Range: Available from 630A to 5000A for all major VCB brands.
APG Epoxy Technology
Our contact arms and insulating cylinders are manufactured using Automatic Pressure Gelation (APG) to eliminate air voids.
- Dielectric Strength: Ensures safe isolation between live parts and the grounded frame (12kV / 40.5kV).
- Partial Discharge: Tested to be less than 5pC, preventing premature insulation failure.
- Thermal Class: High-grade epoxy resin maintains stability even under heavy fault current heat.
High-Tensile Operating Rods
The insulating rod (pull rod) transmits the mechanical force to open the vacuum interrupter. Failure is not an option.
- Tensile Strength: Reinforced composite materials withstand the high-speed opening forces of the VCB mechanism.
- X-Ray Detection: 100% inspection for internal cracks or flaws before shipment.
- Compatibility: Precision-threaded ends (M12/M16) ensure a perfect fit for VS1 and ZN85 breakers.
Manufacturing & Testing of VCB Components
From raw copper purity analysis to final X-Ray inspection, XBRELE ensures every tulip contact and insulating arm meets IEC standards for safety and reliability.
Precision Machining & APG Casting
Our dual production lines handle high-conductivity copper parts and void-free epoxy insulation casting.
- 01
Material Verification
Spectroscopic analysis of T2 Copper purity (≥99.9%) before machining contact fingers.
- 02
CNC Machining & Plating
Precision turning of static contacts followed by thick Silver plating (8-12μm) for conductivity.
- 03
APG Vacuum Casting
Injecting epoxy resin into molds for contact arms and cylinders to ensure void-free insulation.
- 04
X-Ray Flaw Detection
Non-destructive testing of operating rods and arms to detect internal air bubbles or cracks.
- 05
Final Assembly Check
Testing spring pressure on tulip contacts and dimensional fit for VS1/ZN85 compatibility.
Routine & Type Tests
All VCB spares are tested per IEC 62271-1 to guarantee performance in medium voltage switchgear.
Electrical Performance
- Loop Resistance: Verified < 15μΩ for contact assemblies.
- Partial Discharge (PD): < 5pC for epoxy arms at 1.1x rated voltage.
- Power Frequency Withstand: 42kV (12kV parts) / 95kV (40.5kV parts).
Mechanical Reliability
- Tensile Test: Pull rods tested to withstand >2000N force.
- Plating Adhesion: Cross-cut test on silver-plated contacts.
- Torque Test: Verifying thread strength on static contact mounting holes.
Dimensional Check
- Precision check of contact diameter and mounting centers.
- Verification of insulating cylinder inner clearance.
- Surface finish inspection for all conductive parts.
Global Delivery for VCB Spares
XBRELE supports urgent maintenance needs with rapid dispatch of standard tulip contacts and insulating arms. We offer flexible customization for non-standard breaker models and secure export packaging.
Stock for VS1 & VD4 Parts
We maintain strategic inventory of high-demand items like 630A/1250A contacts and standard 12kV arms to minimize your downtime.
- Ready to Ship: Standard contacts dispatched within 3 days.
- Urgent Air Freight: Expedited shipping for critical switchgear repair.
- Replacement Kits: Complete sets of contacts and arms available.
- Sample Service: Check fitment with a prototype before bulk order.
Custom Fabrication
Need a part for an obsolete breaker? We offer reverse engineering and custom molding for contact arms and insulation components.
- Contact Customization: Adjust sheet count (e.g., 24/36/48) for special ratings.
- Mold Design: New APG molds for unique insulating cylinder geometries.
- Material Choice: Option for Copper-Aluminum arms for cost efficiency.
- Retrofit Solutions: Adapters for older JYN/KYN cabinets.
Secure Export Packaging
Precision components require protection. We use silver-safe anti-tarnish paper for contacts and reinforced crates for heavy epoxy parts.
- Anti-Oxidation: Vacuum sealed packaging for silver-plated parts.
- Impact Protection: Foam inserts for each insulating rod and arm.
- Palletized Crates: Secure stacking for sea freight containers.
- Traceability: Batch numbers marked on every component.
Questions About VCB Spare Parts
Common queries regarding compatibility, materials, and replacement of vacuum circuit breaker parts like tulip contacts and insulating arms.