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China Factory VT19-12/24 Indoor HV Vacuum Circuit Breaker - Reliable Suppliers for 12kV & 24kV Power Systems
General
VT19-12/24 indoor AC high voltage vacuum circuit breaker is a switching device unsed for 12kV and 24kV power system, serving as the control and protection unit of electrical equipment in industrial & mining enterprises, power plants and substation. Due to the special advantages of vacuum circuit breaker, it is particularly suitable for applications that require frequent operation of the rated working current or multiple interruptions of short circuit currents.
The circuit breaker features an integrated design of the operating mechanism and the breaker body, with a front-and-back split structure. It has reliable interlocking functions and can be used as a fixed installation unit or in combination with a trolley to form a withdrawable unit.
Standards
The circuit breaker complies with the following standards:
| Standard Code | Description |
|---|---|
| IEC62271-100:2008 | High-voltage switchgear and controlgear |
| GB/T1984-2014 | AC High-Voltage Circuit Breakers |
| JB/T3855-2008 | 3.6~40.5KV Indoor AC High-Voltage Vacuum Circuit Breakers |
| DLT403-2000 | Technical Specifications for Ordering 10-40.5KV High-Voltage Vacuum Circuit Breakers |
Type Designation
Service Conditions
Normal Conditions
- Ambient temperature: +40℃ ~ -15℃
- Relative humidity: Daily average relative humidity ≤ 95%, Daily average vapor pressure ≤ 2.2x10-3MPa
- Relative humidity: Monthly average relative humidity ≤ 90%, Monthly average vapor pressure ≤ 1.8x10-3MPa
- Altitude ≤ 1000m (Suitable for VT19-14/24kV)
- Altitude ≤ 2000m (Suitable for VT19-40.5EP)
- Earthquake intensity: < grade 8
- Installation place: The site should have no water, explosion danger, serious pollution, chemical corrosion and exquisite shake.
Special Service Conditions
If the customer deviates from the normal conditions, it can be consulted with the manufacturer.
※ Note: If the service environment exceeds the above conditions, please consult with the manufacturer.
Technical Parameters
Technical parameters of circuit breaker
| Item | Unit | Parameters | |
|---|---|---|---|
| Rated voltage | kV | 12 | 24 |
| Rated frequency | Hz | 50/60 | |
| 1min Rated power frequency short-time withstand voltage (phase to phase, to earth / isolation distance) | kV | 75 | 125 |
| Rated Lightning impulse withstand voltage (peak) (phase to phase, to earth / isolation distance) | kV | 42 | 65 |
| Rated operation sequence | - | O-0.3s-CO-180s-CO | |
| Type | Rated current (A) | Rated short circuit breaking current (kA) | Rated short circuit making current (peak kA) | Rated duration of short circuit (s) | Rated breaking times of short circuit (times) | Mechanical life (times) |
|---|---|---|---|---|---|---|
| VT19-12 VT19-24 |
630 | 20/25 | 50/63 | 4 | 50 | 30000 |
| 1250 | ||||||
| 1250 | 31.5 | 80 | 4 | 50 | 30000 | |
| 1600 | ||||||
| 2000 | ||||||
| 2500 | ||||||
| 1250 | 40 | 100 | 4 | 30 | 30000 | |
| 1600 | ||||||
| 2000 | ||||||
| 2500 | ||||||
| 3150 | ||||||
| VT19-12 | 3150 | 50 | 125 | 4 | 20 | 20000 |
| 4000 |
Note: 4000A need forced cold wind.
Mechanical characteristic parameters of circuit breaker
| S/N | Parameter name | Unit | Data | |
|---|---|---|---|---|
| 12kV | 24kV | |||
| 1 | Clearance between open contacts | mm | 9 ± 1 (11 ± 1 According to interrupter parameters) | 13 ± 1 |
| 2 | Over-travel | mm | 3.5 ± 0.5 | |
| 3 | Three phase opening and closing asynchronous | ms | ≤ 2 | |
| 4 | Bounce time of closing contact | ms | ≤ 2 / ≤ 3(50kA) | |
| 5 | Contact pressure of closing contact | N | 20kA, 25kA, 31.5kA, 40kA, 50kA | |
| 2000±200, 2400±200, 3100±200, 4250±200, 5500±200 | ||||
| 6 | Average opening speed | m/s | 0.9~1.3 | 1.1~1.6 |
| 7 | Average closing speed | m/s | 0.4~0.8 | 0.6~1.0 |
| 8 | Each phase circuit resistance (Except contact arm) | μΩ | / | / |
Opening and closing time
| Type | Closing time (ms) | Opening time (ms) |
|---|---|---|
| 12&24kV | 30-70 | 15-45 |
Outline Dimension Drawing
VT19-12kV
A) Fixed type
Note: The dimension indicated in the parentheses is the fitting dimension of the composite insulated pole.
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5 | 31.5, 40 |
| Distance between phases (mm) | 150 ± 1.5 | ||
| Top interlock L1 of mechanism | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
| Spindle interlock L2 (mm) | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
Outline dimension drawing of VS1 (VTD6)-12 fixed type circuit breaker (Distance between phases is 150mm)
Note: The dimension in brackets refers to the dimension from the outgoing terminal of the composite insulated pole to the center of the pole.
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5 | 31.5, 40 |
| Distance between phases (mm) | 210 ± 1.5 | ||
| Top interlock L1 of mechanism | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
| Spindle interlock L2 (mm) | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
Outline dimension drawing of VS1 (VTD6)-12 fixed type circuit breaker (Distance between phases is 210mm)
| Rated current (A) | 1600 | 2000 | 2500 | 3150 | 4000 |
| Rated short-circuit breaking current (kA) | 31.5, 40 | 40, 50 | |||
| Distance between phases (mm) | 275 ± 1.5 | ||||
| Mechanism top interlock L1 (mm) | 30, 50 (Interlock can be extended from left side or right side, length can be customized according to customer requirements) | ||||
| Mechanism main shaft interlock L2 (mm) | 30, 50 (Main shaft has left output or right output, length can be customized according to customer requirements) | ||||
Figure 3: Fixed Type VT19-12 (Phase spacing of 275mm) Circuit Breaker Outline Dimension Diagram
B) Handcart type (Travel distance 200mm)
| Rated current (A) | 630 | 1250 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5 |
| Dimension of static contact (mm) | Φ35 | Φ49 |
| Distance between phases (mm) | 150 ± 1.5 | |
Figure 4: Handcart Type VT19-12 Circuit Breaker Outline Dimension Diagram (configured in medium-mounted cabinet with a width of 550mm)
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5, 40 | 31.5, 40 |
| Dimension of static contact (mm) | Φ35 | Φ49 | Φ55 |
| Distance between phases (mm) | 150 ± 1.5 | ||
Outline dimension drawing of VS1 (VTD6)-12 withdrawable type circuit breaker (For cabinet width 650mm)
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5, 40 | 31.5, 40 |
| Dimension of static contact (mm) | Φ35 | Φ49 | Φ55 |
| Distance between phases (mm) | 210 ± 1.5 | ||
Outline dimension drawing of VS1 (VTD6)-12 withdrawable type circuit breaker (For cabinet width 880mm)
| Rated current (A) | 1600 | 2000 | 2500 | 3150 | 4000 |
| Rated short circuit breaking current (A) | 31.5, 40 | 31.5, 40 | 40, 50 | ||
| Dimension of static contact (mm) | Φ79 | Φ109 | |||
| Distance between phases (mm) | 275 ± 1.5 | ||||
Outline dimension drawing of VS1 (VTD6)-12 withdrawable type circuit breaker (For cabinet width 1000mm)
C) Fixed type - 24kV
Note:
1. The outgoing conductive surface of 1600A fixed & sealed pole and transition conductive block of the connecting busbar shall be provided by customer.
2. The dimension in brackets refers to the dimension from the outgoing terminal of the composite insulated pole to the center of the pole.
1. The outgoing conductive surface of 1600A fixed & sealed pole and transition conductive block of the connecting busbar shall be provided by customer.
2. The dimension in brackets refers to the dimension from the outgoing terminal of the composite insulated pole to the center of the pole.
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5, 40 | |
| Distance between phases (mm) | 275 ± 1.5 | ||
| Top interlock L1 of mechanism | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
| Spindle interlock L2 (mm) | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | ||
Outline dimension drawing of VS1 (VTD6)-24 fixed type circuit breaker (Distance between phases is 275mm)
| Rated current (A) | 1600 | 2000 | 2500 | 3150 |
| Rated short circuit breaking current (A) | 31.5, 40 | |||
| Distance between phases (mm) | 275 ± 1.5 | |||
| Top interlock L1 of mechanism | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | |||
| Spindle interlock L2 (mm) | 30, 50 (Interlock extended from left or right, and the length can be made as per the requirements of clients) | |||
Outline dimension drawing of VS1 (VTD6)-24 fixed type circuit breaker (Distance between phases is 275mm)
D) Withdrawable type - 12kV (trolley travel distance is 300m)
| Rated current (A) | 630 | 1250 | 1600 |
| Rated short circuit breaking current (A) | 20, 25, 31.5 | 25, 31.5, 40 | 31.5, 40 |
| Dimension of static contact (mm) | Φ35 | Φ49 | Φ55 |
| Distance between phases (mm) | 275 ± 1.5 | ||
Outline dimension drawing of VS1 (VTD6)-24 withdrawable type circuit breaker (For cabinet width 1000mm)
| Rated current (A) | 1600 | 1600 | 2000 | 2500 | 3150 |
| Rated short circuit breaking current (A) | 31.5, 40 | 31.5, 40 | 31.5, 40 | ||
| Dimension of static contact (mm) | Φ55 | Φ79 | Φ109 | ||
| Distance between phases (mm) | 275 ± 1.5 | ||||
Outline dimension drawing of VS1 (VTD6)-24 withdrawable type circuit breaker (For cabinet width 1000mm)
Frequently Asked Questions (FAQ)
What are the main applications of the VT19-12/24 indoor vacuum circuit breaker?
The VT19-12/24 is designed for 12kV and 24kV power systems. It is widely used as a control and protection unit in industrial and mining enterprises, power plants, and electrical substations, especially in operations requiring frequent current switching or short circuit interruptions.
Which international and domestic standards does the VT19 circuit breaker comply with?
It complies with IEC62271-100:2008 (High-voltage switchgear), GB/T1984-2014 (AC High-Voltage Circuit Breakers), JB/T3855-2008, and DLT403-2000 standards.
What are the normal environmental service conditions required for installation?
The ambient temperature should be between -15℃ and +40℃. The daily average relative humidity must not exceed 95% (monthly ≤ 90%). The installation site should be free from water, explosion hazards, serious pollution, chemical corrosion, and intense vibrations.
What is the mechanical life expectancy of the VT19 vacuum circuit breaker?
Depending on the specific type and rating, the VT19 circuit breaker offers a long mechanical service life of 20,000 to 30,000 operations.
Does the 4000A rated current model require special cooling?
Yes, the 4000A rated current model requires forced cold wind cooling to maintain normal operating temperatures.
Can the VT19 circuit breaker be customized for special environmental conditions?
Yes. If your installation site deviates from standard conditions (such as high altitude or extreme temperatures), you can consult directly with the manufacturer for tailored solutions.