1.PRODUCT GENERAL INFORMATION

2. COMMERCIAL TERMS

3. PRODUCT DESCRIPTION

The ZN63(VS1)-12 Series VS1 12KV Indoor HV Vacuum Circuit Breaker 630-3150A 20-31.5KA Embedded Pole Spring Mechanism Drawout &Fixed IEC Certified VCB employs three independently sealed vacuum interrupter poles on a withdrawable handcart chassis. Each interrupter uses high-purity CuCr contact materials in a ceramic or glass envelope evacuated to 10^-4 Pa — a sealed-for-life design requiring zero field maintenance over a 30-year service life. The motor-driven stored-energy spring mechanism stores closing energy within 15 seconds and supports the standard O-0.3s-CO-180s-CO auto-reclose sequence. Breaking time from trip coil energization is under 60ms, ensuring rapid fault clearance that minimizes arc energy and contact erosion. The handcart incorporates a screw-type racking mechanism with positive interlocks permitting movement only between isolated, test, and service positions — preventing operator error during insertion and withdrawal.

Capacitor bank switching is rated for 630A single bank and 400A back-to-back, confirming restrike-free vacuum interruption for power factor correction circuits. In systems protecting oil-filled transformers, restrike-free operation prevents switching overvoltages that accelerate transformer oil type insulation aging — directly mitigating transformer failure modes such as dielectric stress and incremental winding damage in high-switching-frequency applications. Auxiliary contacts (8NO+8NC), mechanical position indication, non-resettable operation counter, and both mechanical and electrical anti-pumping protection complete the control interface. Full KYN28A-12 dimensional compatibility enables seamless integration into new panel construction and retrofit switchgear projects.

4. Circuit Breaker Technical Parameters (12kV)

5. APPLICATIONS

• Universal 12kV Indoor Protection Platform: Six current ratings (630–3150A) and four breaking ratings (20–40kA) cover every 12kV indoor switching duty — from distribution feeders and transformer feeder protection to 3150A/40kA generator main circuits. IEC 62271-100 type certification ensures compliance readiness for utility, industrial, and EPC procurement.
• Generator Circuit Breaker Service (3150A/40kA): The 3150A continuous rating with 40kA breaking and 100kA peak withstand provides high-current, high-fault-level protection required for generator main circuit breaker duty in industrial co-generation and distributed generation facilities.
• Capacitor Bank and Reactive Compensation Switching: Rated for 630A single and 400A back-to-back capacitor bank switching with restrike-free vacuum interruption — suitable for power factor correction and harmonic filter circuits in utility and industrial substations.
• High-Endurance Industrial Applications: 20,000 mechanical operations and 50 electrical operations at 31.5kA make this the preferred indoor vacuum circuit breaker for arc furnace supply, rolling mill protection, and frequent-duty substation applications where standard endurance ratings prove insufficient over the equipment lifecycle.

6. COMPETITIVE ADVANTAGES

20,000-Operation Mechanical Life — Double the Industry Standard: The ZN63(VS1)-12 achieves 20,000 mechanical close-open cycles — double the 10,000-operation rating of conventional indoor vacuum circuit breakers. Hardened alloy steel cam profiles, lifetime-lubricated sealed bearings, and precision-ground linkage pivots deliver this endurance. For frequently switched applications such as arc furnace supply, rolling mill protection, and capacitor bank control, this translates to additional decades of service life without mechanism overhaul — directly addressing the lifecycle cost versus first-cost trade-off that value engineering reviews force on procurement teams.

Class-Leading Electrical Endurance — 50 Operations at 31.5kA: The ZN63(VS1)-12 achieves 50 full-rated breaking operations at 31.5kA and 30 operations at 40kA — values that significantly exceed the 20–30 operation ratings typical of competing indoor vacuum breakers. For substations where accumulated fault operations over decades approach standard electrical endurance ratings, the 50-operation capability at 31.5kA eliminates premature interrupter replacement — removing associated outage, labor, and disposal costs from the lifecycle budget entirely.

IEC 62271-100 and KEMA Type-Test Certification: JYDQ manufactures every VS1 12KV Indoor HV Vacuum Circuit Breaker 630-3150A 20-31.5KA Embedded Pole Spring Mechanism Drawout &Fixed IEC Certified VCB under ISO 9001 with complete type-test certification at KEMA-accredited laboratories. Factory tests cover power-frequency withstand at 42kV, lightning impulse at 75kV, vacuum integrity, and mechanical timing characterization. For multi-stakeholder procurement teams spanning engineering, procurement, and project management, this documentation package provides the technical evidence base required for grid authority approval and international tender pre-qualification.

FAQ

1. What is withdrawable vacuum circuit breaker? What is its advantage?

Withdrawable vacuum circuit breaker is designed for indoor switchgear. It can be pushed in and pulled out from the cabinet easily. It is convenient for maintenance, replacement and isolation of power circuit for safety.

2. What is the rated short-circuit withstand current of vacuum circuit breaker?

The rated short-time withstand current matches the short-circuit breaking current. We can select different withstand current level according to your grid short-circuit capacity requirement.

3. Can vacuum circuit breaker be equipped with online monitoring function?

Yes, we can integrate temperature monitoring, mechanical stroke monitoring and vacuum degree monitoring modules, to realize real-time online status monitoring for the breaker.

4. Can vacuum circuit breakers operate in dusty industrial sites?

Yes. We can adopt sealed mechanism box design to prevent dust from entering the operating mechanism and vacuum interrupter, protecting internal components.

5. What warranty support do you provide for vacuum circuit breakers?

We guarantee 10 years warranty for all vacuum circuit breakers. We provide professional technical consultation for commissioning and routine inspection during warranty period.