VXB-40.5P Indoor High-Voltage AC Vacuum Circuit Breaker

Advanced Insulation Structure：The VXB-40.5P series indoor high-voltage AC vacuum circuit breaker utilizes a composite insulation structure with solid-embedded poles, effectively protecting insulation performance against adverse environmental conditions such as humidity, contamination, and condensation.
Comprehensive & Reliable Safety Interlocking：Equipped with complete five-prevention safety interlocks, the circuit breaker can only be closed when the truck is in the Service position or Test position. During the racking-in or racking-out process, the electric closing circuit is automatically disconnected, and the closing half-shaft is mechanically locked to completely prevent misoperation.
Optimized Design & High Interchangeability：Featuring a well-structured layout, modern appearance, and high component standardization, the unit offers excellent interchangeability inside the switchgear. All mechanical operations are smooth and effortless, supported by a complete range of functional truck options.
Rigorous Quality Assurance：Every unit undergoes strict factory performance testing and a 300-cycle mechanical endurance break-in prior to delivery, ensuring maximum product reliability.
Superior Performance for Heavy-Duty Applications：Boasting a long service life, low maintenance, zero pollution, zero explosion hazard, and low operating noise, it is ideally suited for demanding operating conditions requiring frequent switching operations.

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Describe Display

The VXB-40.5P series indoor high-voltage AC vacuum circuit breaker is designed for power systems with a rated voltage of 40.5 kV and a three-phase AC frequency of 50 Hz. It is a brand-new vacuum circuit breaker independently developed by our company through optimized design.

Designed with a truck-mounted (withdrawable) structure, the circuit breaker can be used in conjunction with KYN61-40.5 switchgear. Equipped with a complete and reliable interlocking mechanism, it fulfills the "Five-Prevention" (five safety interlocks) requirements, making it particularly suitable for the protection and control of electrical facilities in industrial and mining enterprises, as well as substations.

Product parameters

Ambient Temperature: -15°C to +40°C
Altitude: ≤ 2000 m (customizable up to 4000 m upon request)
Relative Humidity:
Daily average: ≤ 95%
Monthly average: ≤ 90%
Seismic Intensity: ≤ 8 degrees (on the MMI scale)
Operating Environment: Free from fire hazards, explosion risks, severe contamination, chemical corrosion, and violent vibrations.
Special Conditions: For operation beyond the above environmental parameters, please consult the manufacturer.

Related Notes

Circuit breaker testing mainly consists of Type Tests and Routine Tests.

Type Tests are comprehensive evaluation tests conducted to verify product performance and compliance with national/international standards. They apply to newly developed products, transferred production, products with major design modifications, and periodic quality audits.

Routine Tests are mandatory inspection items for every individual unit prior to leaving the factory, ensuring product quality compliance.

Type tests shall be performed under any of the following circumstances:

a) Newly developed prototype products shall undergo a complete series of type tests.
b) Products transferred to another manufacturing facility for production shall undergo a complete series of type tests.
c) Products manufactured at a different geographical site shall undergo a complete series of type tests.
d) When significant changes are made to the product's design, manufacturing process, production conditions, or raw materials that may affect product performance, relevant type tests shall be conducted.
e) For standard production items, relevant type tests shall be re-conducted every eight years.

Scope of Testing

Type Tests cover comprehensive evaluations including mechanical performance, insulation performance, temperature-rise tests, short-time withstand current and peak withstand current tests (dynamic and thermal stability tests), and capacitive current switching tests.

Routine Tests typically involve basic electrical performance tests and safety inspections, including insulation tests on the main circuit, tests on auxiliary and control circuits, measurement of main circuit resistance, design and visual checks, as well as mechanical operation tests.