قاطع دوائر كهربائية فراغي داخلي يعمل بالتيار المتردد عالي الجهد

VTB-12 (ZN63D)
The VTB-12P series indoor high-voltage AC vacuum circuit breaker is suitable for power systems with a rated voltage of 12kV and three-phase AC 50Hz. It is a new generation vacuum circuit breaker independently developed by our company. It adopts a modular integrated spring operating mechanism with superior mechanical performance, especially suitable for frequent operation and multiple breaking of short-circuit currents. Circuit breakers can be used as fixed installation units or with dedicated propulsion mechanisms to form a handcart unit; It can be used in conjunction with KYN28A-12 switchgear, and can also be installed in fixed switchgear such as XGN2-12 and GG-1A, with reliable mechanical interlocking.

Product Advantages
The novel and unique exterior design is inspired by high-voltage iron towers, showcasing the reliable performance of the product.
The modular operating mechanism with a modular structure layout is reasonable and easy to maintain.
The optimization design of the electric field in a conductive circuit significantly improves the overall insulation level.
The mechanical lifespan can reach up to 30000 times, and the rated current breaking times can reach 50 times. It can be maintenance free within each operating cycle and is suitable for frequent operation.
Intelligent control of opening and closing operations to prevent electromagnetic burnout and reduce downtime caused by malfunctions.
Circuit breaker anti tripping and microcomputer protection anti tripping do not affect each other, making their use more worry free.
Application Scenarios
This product is suitable for three-phase AC 50Hz, rated voltage 12kV distribution systems, widely used in power systems such as industrial and mining, enterprises, power plants, substations, etc., to control and protect cables, overhead lines, transformers, generators, capacitor banks, motors, etc.

Parameter name	Unit	Parameter value
Rated Voltage	kV	12
Rated frequency	HZ	50
Rated current	A	630/1250/1600/2000/2500/3150/4000/5000
Power frequency withstand voltage (1min) – phase-to-phase/phase-to-ground	kV	42
Power frequency withstand voltage (1min) – fracture	kV	48
Power frequency withstand voltage (1min) – Auxiliary and control circuits	kV	2
Lightning impulse withstand voltage – phase-to-phase/phase-to-ground	kV	75
Lightning impulse withstand voltage – fracture	kV	85
Rated short-circuit breaking current	kA	25/31.5/40/50
Rated short-circuit making current	kA	63/80/100/125
Rated peak withstand current	kA	63/80/100/125
Rated short-time withstand current	kA	25/31.5/40/50
Rated short-circuit duration	S	4
Rated operation sequence	–	O-0.3s-CO-180s-CO
DC component of rated short-circuit breaking current	%	52
Rated short-circuit breaking current and breaking times	time	50 (when 1250A and 31.5kA or below), 30 (when 1600A or 40kA or above)
mechanical life	time	30000 (1250A and 31.5kA and below), 20000 (1600A~4000A and 40kA and below), 10000 (5000A or 50kA)
Rated cable charging breaking current	A	25
Rated out-of-phase grounding breaking current	kA	21.8/27.4/34.8/43.5
Rated out-of-step breaking current	kA	6.25/7.87/10/12.5
Rated operating voltage	V	AC/DC 220V、AC/DC 110
Vacuum degree of vacuum arc-extinguishing chamber	Pa	Pa s1.33×10-3
Single/back-to-back capacitor bank breaking current	A	800/630

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