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KYN28-12
VS1-3.3 Vacuum Circuit Breaker
The 3.3KV VS1 circuit breaker is an indoor AC high-voltage vacuum circuit breaker designed specifically for low-voltage distribution network terminals, small industrial plants, and underground local power supply systems. It is suitable for three-phase 50Hz power frequency AC circuits, with a rated voltage of 3.3KV, and is mainly used for circuit control, protection, and frequent operation scenarios. This product adopts an integrated design of mechanism and circuit breaker, which is compact in size and lightweight, suitable for installation in small switchgear. It can be flexibly installed in a fixed or withdrawable handcart form to meet the control and protection needs of power supply equipment in small spaces.
The product is manufactured strictly in accordance with standards such as GB1984, DL/T403, and IEC60056. The arc extinguishing medium and contact gap insulation medium are all high vacuum degree vacuum, with stable arc extinguishing performance and no fire or explosion hazards. It can effectively cut off fault currents such as overload and short circuit, ensuring the safe and stable operation of low-voltage distribution network terminals and small electrical equipment. It is suitable for working environments with altitude ≤ 2500m and ambient temperature of -35 ℃~45 ℃.
Features
1. Strong adaptability and compact size:
pecially designed for the end of 3.3KV low-voltage distribution network, with a compact structure and light weight, it can directly adapt to small switchgear and small installation spaces such as underground and small factories, without the need for additional expansion and renovation. It is easy to install and saves space.
2. Reliable operation, suitable for frequent start stop:
Adopting a mature spring energy storage operating mechanism, supporting manual and electric dual operation modes, the mechanical life can reach 30000 times, and the full capacity short-circuit current breaking times can reach 50 times. It can adapt to the frequent start stop requirements of small equipment, with high operational stability and less susceptibility to jamming faults.
3. Precise protection and outstanding safety:
Equipped with multiple protection devices for overload, short circuit, and undervoltage, the fault response speed is fast, and the opening time is controlled within 20-50ms, which can quickly cut off the fault current and prevent the fault from expanding; The vacuum arc extinguishing design has no harmful gas emissions, eliminates the risk of fire and explosion, and is suitable for special safety requirements such as underground.
4. Convenient maintenance and low operation and maintenance costs:
The ordinary type adopts a vertical insulation cylinder design, which can effectively resist various climate influences. Daily maintenance only requires intermittent cleaning or lubrication of the operating mechanism; Optional fixed sealed pole structure can be configured to achieve maintenance free operation, significantly reducing the labor and material costs of operation and maintenance, and adapting to scenarios with limited operation and maintenance resources in small factory areas.
5. Strong universality and good interchangeability:
The electrical components adopt modular design, which is easy to disassemble and replace. They are interchangeable with similar components of VS1 circuit breakers of the same voltage level in China, and there is no need for additional customization for later accessory replacement, further reducing operation and maintenance costs and downtime.
The rated current of this product covers 630A~1600A, the rated short-circuit breaking current can reach 20~25kA, the rated short-circuit duration is 4s, the closing bounce time is ≤ 2ms, and the opening and closing asynchrony is ≤ 2ms, meeting the load requirements of small industrial equipment and low-voltage distribution network terminals; The suitable environmental conditions are: the daily average relative humidity does not exceed 95%, the monthly average does not exceed 90%, and there is no severe vibration, chemical corrosion, or explosion hazard in the place.
Protection upgrade plans can be customized according to special scenarios such as underground, high temperature, and high humidity. The product supports remote monitoring interface reservation and can be paired with intelligent control units to achieve fault self diagnosis, remote operation, and status monitoring functions, adapting to the intelligent upgrade needs of small distribution networks; Compliant with KEMA type test A-level certification standards, each product undergoes strict factory testing, accompanied by complete testing reports and certificates of conformity, ensuring reliable and guaranteed quality.
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Specification
| Item | Unit | Data | ||||
| Rated voltage | kV | 3.3 | ||||
| Rated frequency | Hz | 50 | ||||
| Rated insulation level | 1-minute power frequency withstand voltage (effective value) | kV | 12 | |||
| Lightning impulse withstand voltage (peak value) | kV | 23 | ||||
| Rated current | A | 630 | 630 | 1250 | 1600 | |
| 1250 | 1250 | 1600 | 2000 | |||
| 2000 | 2500 | |||||
| 2500 | 3150 | |||||
| 4000 | ||||||
| Rated short-circuit breaking current | kA | 20 | 25 | 31.5 | 40 | |
| Rated short-time withstand current | 20 | 25 | 31.5 | 40 | ||
| Rated short-circuit closing current | 50 | 63 | 80 | 100 | ||
| Rated peak withstand current | 50 | 63 | 80 | 100 | ||
| Rated short-circuit duration | S | 4 | ||||
| Rated operating sequence | O – 0.3s – CO – 180s – CO | |||||
| Split 180s Split 180s Split (40kA) | ||||||
| Rated short-circuit current breaking times | 30/20 | |||||
| Mechanical lifespan | 10000 | |||||
| Rated breaking current of a single capacitor bank | 630 | |||||
| Rated back-to-back capacitor bank breaking current | 400 | |||||
| Grounding fault breaking current of different phases | kA | 10 | ||||
| Allowable wear and accumulated thickness of dynamic and static contacts | 3 | |||||
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FAQs
What is the core difference between 3.3KV VS1 circuit breaker and 6KV VS1 circuit breaker?
The core difference lies in the different scenarios of rated voltage adaptation: the 3.3KV model is designed specifically for low-voltage distribution network terminals, small factory areas, and underground local power supply, with a smaller volume and adaptability to narrow spaces. The rated breaking current is relatively moderate (20-25kA), focusing on adapting to frequent operation of small equipment; The 6KV model is suitable for medium voltage distribution networks, with a higher rated breaking current and slightly larger size. It focuses on the protection of medium and large industrial equipment and park distribution networks. The operating mechanism, arc extinguishing chamber specifications, and installation dimensions of the two are different and cannot be used interchangeably.
Can this circuit breaker be used in underground power supply systems?
Sure. This product itself has the advantages of no fire, no explosion, and no harmful gas emissions, and is suitable for special safety requirements underground. It can be customized with protection upgrades according to underground working conditions (such as dust prevention, moisture prevention, and enhanced anti vibration), while meeting the needs of frequent operation and precise protection of underground power supply systems. During installation, it needs to be used in conjunction with a dedicated underground switchgear to ensure compliance with underground electrical safety standards.
What parts should be focused on for daily maintenance?
Daily maintenance focuses on three points: first, cleaning and lubrication of the operating mechanism, cleaning every six months and adding specialized lubricating oil once a year; Secondly, check the tightness of the wiring terminals to avoid looseness and poor contact; Thirdly, observe the appearance of the arc extinguishing chamber, and replace it promptly if any abnormalities such as damage or air leakage occur; The fixed sealed pole type does not require additional maintenance and only requires regular inspection of the equipment’s operating status indicator lights.
What are the common reasons for product disconnection failure?
There are four common reasons: ① Insufficient energy storage in the operating mechanism (electric energy storage power failure or manual energy storage not in place); ② The opening coil is damaged or the wiring is loose; ③ Mechanical jamming (foreign object blockage or insufficient lubrication); ④ The protective device has not been reset, resulting in the interlocking lock opening. You can first check the energy storage status and wiring. If it is not resolved, contact professional personnel to investigate the mechanical and electrical components. Do not disassemble the arc extinguishing chamber by yourself.
Can it be upgraded to intelligent remote control mode?
Sure. This product reserves a remote monitoring interface and can be equipped with an intelligent control unit to achieve remote opening and closing, fault alarm, status monitoring (such as current, voltage, temperature monitoring), and fault self diagnosis functions. After upgrading, there is no need for on-site monitoring, and the equipment operation status can be remotely grasped, which is suitable for the intelligent management needs of small distribution networks. The upgrade process does not affect the installation and operation of the original equipment.
Related Applications
Local power supply system for small industrial plants: mainly used for power distribution control and protection in small processing plants, workshops, and other places, such as workshop power distribution in small mechanical processing plants and food processing plants. It is responsible for controlling the power supply of small electrical equipment such as machine tools, fans, and water pumps in the workshop, quickly cutting off overload and short circuit faults, ensuring the normal operation of workshop production equipment, adapting to the small distribution space and frequent start stop working conditions in the plant area, and reducing operation and maintenance costs.
Underground local power supply system: Suitable for power supply in local areas such as coal mines and metal mines, such as underground excavation workfaces and underground parking lots. Due to the product’s no fire or explosion hazards, small size, and excellent protection performance, it can operate stably in small and humid underground environments, control the power supply of key equipment such as underground ventilation fans and drainage pumps, avoid safety hazards caused by power outages, and ensure the safety of underground operations.
Low voltage distribution network end branch protection: Used for the protection of end branch lines in urban and rural distribution networks, such as the end branches in residential distribution rooms and rural substations. It is responsible for cutting off overload and short circuit faults in branch lines, avoiding the spread of faults to the main network, ensuring the electrical safety of residents and small commercial users, and adapting to the narrow installation space requirements of end distribution networks. It can be flexibly used with small switchgear.
Small backup power switching system: used for switching control of small generators and UPS backup power, such as backup power distribution in small enterprises and communities. When the main power supply is interrupted, it can quickly switch to the backup power supply to ensure continuous power supply for emergency lighting and critical small equipment. The product is reliable to operate, responsive, and suitable for frequent power supply switching conditions. At the same time, it is compact in size and can be integrated into the backup power control cabinet.
