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NVT-12 Embedded-pole Medium-Voltage Vacuum Circuit Breaker

NVT-12 Embedded-pole Medium-Voltage Vacuum Circuit Breaker
NVT-12 Embedded-pole Medium-Voltage Vacuum Circuit Breaker
NVT-12 Embedded-pole Medium-Voltage Vacuum Circuit Breaker

A new-generation 12 kV maintenance-free medium voltage vacuum circuit breaker with a fully modular spring mechanism, rated current up to 4000 A, short-circuit breaking current up to 50 kA, and compatibility with mainstream global switchgear cubicles.

4000 A rated current
Fully modular mechanism
50 kA short-circuit breaking
Maintenance-Free Embedded Pole
650/800/1000 mm cubicle compatibility
30,000 operations mechanical endurance
Model:NVT-12
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Key Benefits

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Maintenance-Free Embedded Pole
The medium-voltage vacuum circuit breaker features vacuum interrupter integrally cast in epoxy resin to isolate it from the external environment, enabling lifetime maintenance-free operation of the main circuit.
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Fully Modular Quick Replacement
With modular design on motor, coils, auxiliary switches and other wear parts, this insulated circuit breaker allows quick component replacement can be completed within 5 minutes.
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High Current and Breaking Capacity
The medium voltage circuit breaker delivers excellent electrical performance: rated current up to 4000 A and rated short-circuit breaking current up to 50 kA.
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Long Mechanical Life
For 20/25/31.5kV specifications, the medium-voltage circuit breaker achieves mechanical endurance of 30,000 operations and meets E2 electrical endurance standard.

Product Overview

NVT-12 is a new-generation 12 kV embedded-pole vacuum circuit breaker launched by NATUS Electric by integrating 50 years of power equipment manufacturing experience. It fully complies with Chinese national and industry standards.
The medium-voltage circuit breaker adopts well-known domestic vacuum interrupters and advanced embedded insulation technology, and is equipped with a mature and reliable modular spring operating mechanism. It features a simple structure, stable operation and maintenance-free performance. It can be flexibly installed in mainstream 650 mm, 800 mm and 1000 mm medium-voltage switchgear at home and abroad. Its interface dimensions are fully interchangeable with mainstream global circuit breakers, and it has extensive global application records. As a medium-voltage breaker, it is widely used in power plants, substations, petrochemical, metallurgy, manufacturing, airports and other medium-voltage distribution scenarios, and is suitable for short-circuit current breaking, cable / transformer / generator switching, capacitor bank switching and other operating conditions.
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Product Structure

The closing unit features a simple structure and reliable operating principle. It not only fundamentally eliminates faults such as failure to maintain after closing and refusal to open, but also reduces the tripping power required for opening.
The fully modular structural design gives the NVT circuit breaker a clear overall functional configuration, simple operation and maintenance, and reliable operation.

Technical Advantages

01.
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Optimized opening buffer technology
Fitted with a high-performance opening oil buffer, the medium-voltage breaker fully absorbs opening energy, effectively reducing moving-contact overtravel and rebound, lowering the probability of arc restrike, protecting the bellows of the vacuum interrupter and extending mechanical life.
02.
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Compact design
Thanks to epoxy resin insulation, the nvt series vacuum circuit breaker greatly reduces phase-to-phase and phase-to-ground distances, making the circuit breaker compact and suitable for 650 mm-wide compact switchgear to save distribution room space.
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Intelligent expansion capability
Reserved Smart Upgrade Interfaces support electric chassis trucks for remote opening/closing and truck racking. Current, voltage and temperature sensors can be added for online condition monitoring and fault diagnosis.

Technical Specifications

ParameterSymbol / UnitSpecification
Rated voltageUr [kV]12
Power frequency withstand voltage (1 min) - between phases and to earthUd(1min) [kV]42
Power frequency withstand voltage (1 min) - between breaksUd(1min) [kV]48
Lightning impulse withstand voltage - between phases and to earthUp [kV]75
Lightning impulse withstand voltage - between breaksUp [kV]85
Control circuit power-frequency withstand voltage (1 min)[V]2000
Control circuit supply voltage[V]AC 110/220, DC 110/220
Rated frequencyFr [Hz]50/60
Rated operating sequence-20 kA-40kA: O-0.3s-CO-180s-CO
50 kA: O-180s-CO-180s-CO



Rated current Ir [A]6301250 / 16002000 / 250031504000①
Rated short-circuit breaking current Ics [kA]20 / 25 / 31.520 / 25 / 31.5 / 4031.5 / 4031.5 / 40 / 5040 / 50
Rated short-time withstand current (4s) Ik [kA]20 / 25 / 31.520 / 25 / 31.5 / 4031.5 / 4031.5 / 40 / 5040 / 50
Rated peak withstand current Ip [kA]50 / 63 / 8050 / 63 / 80 / 10080 / 10080 / 100 / 125100 / 125
Rated capacitor bank breaking current [A]400400400400400
Rated capacitor bank making inrush current [kA] (4250Hz)2020202020



Mechanical characteristicUnitSpecification
Mechanical enduranceTimes30000 / 20000② Class M2
Electrical endurance-E2
Opening timems20-50
Arcing timems10-15
Total breaking timems30-65
Closing timems35-70


Notes: ① Forced air cooling is required for 4000 A. ② When the rated short-circuit breaking current is 40kA or 50 kA, the mechanical endurance is 20,000 operations.

Application Scenarios
工业行业
石油石化
新能源

Product FAQ

The interface dimensions of NVT-12 are fully compatible with 12 kV vacuum circuit breakers from mainstream international brands such as ABB, Schneider and Siemens. It can be directly replaced without modifying the switchgear.
The mechanical life is 30,000 operations for 20/25/31.5 kA ratings and 20,000 operations for 40/50 kA ratings, reaching Class M2. Regular maintenance can effectively extend actual service life.
When rated current exceeds 2500 A, a cooling cover is required. The 4000 A model also requires a forced air cooling system to keep temperature rise within the standard range.
It supports remote operation through an electric chassis truck, contact temperature online monitoring, mechanical characteristic online monitoring, partial discharge monitoring and integration into distribution automation systems.
The embedded pole integrally casts the vacuum interrupter in epoxy resin, isolating it from dust, moisture and other external environmental factors. It provides more stable insulation performance, reduces conductive connection points, lowers loop resistance, improves reliability and enables maintenance-free operation of the main circuit.
Maintenance is very convenient. All wear parts are modular and can be replaced quickly without disassembling the whole mechanism. Simple maintenance can be completed by ordinary electricians, while complex faults are supported by professional technicians.
Yes. NVT-12 medium-voltage vacuum circuit breaker has passed capacitor bank switching tests, with a rated capacitor bank breaking current of 400 A and rated making inrush current of 20 kA, enabling safe and reliable capacitor bank switching.

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