12 kV Cable Branch Box
- Rated voltage:
- 12 kV
- Rated current:
- 630 A
- Dynamic Short-Circuit Current:
- 50 kA/0.3 s
- Thermal Short-Circuit Current:
- 20 kA/3 s
- Power Frequency Withstand Voltage (1 min):
- 42 kV
- DC Withstand Voltage (15 min):
- 52 kV
- Lightning Impulse Withstand Voltage:
- 105 kV
- Enclosure Protection Class:
- IP33
Product Overview
The European cable distribution box is widely used in cable-based power distribution systems in recent years. Its main features include a double-sided door design and the use of wall bushings as connecting busbars. This design offers a compact structure, neat cable arrangement, and eliminates the need for large-span crossing of three-core cables, providing significant installation advantages.
The cable connectors used comply with DIN 47636 standards. The system typically adopts 630 A rated current bolted-type cable connectors, ensuring reliable and secure electrical connections.
Model description
Conditions of Use
◆ Ambient temperature: Maximum +40 ℃, Minimum -30 ℃;
◆ Wind speed: Equivalent to 34 m/s (not exceeding 700 Pa);
◆ Humidity: Daily average relative humidity ≤95 %, Monthly average relative humidity ≤95 %;
◆ Seismic resistance: Horizontal acceleration ≤0.4 m/s², Vertical acceleration ≤0.15 m/s²;
◆ Installation site tilt: Not more than 3 °;
◆ Installation environment: Ambient air should not be obviously polluted by corrosive or flammable gases, vapor, etc., and the installation site should be free of severe vibration;
◆ Note: If this product is to be used beyond the above conditions, please consult our company.
DFW12/630AB-□ type touchable cable connector accessories
Product Specifications
| Item | Specifications |
| Rated Voltage | 12 kV |
| Rated Current | 630 A |
| Dynamic Short-Circuit Current | 50 kA/0.3 s |
| Thermal Short-Circuit Current | 20 kA/3 s |
| Power Frequency Withstand Voltage (1 min) | 42 kV |
| DC Withstand Voltage (15 min) | 52 kV |
| Lightning Impulse Withstand Voltage | 105 kV |
| Enclosure Protection Class | IP33 |
Pre-Installation Inspection and Testing
◆The cable branch box should undergo the following inspection and testing before installation and operation:
◇Voltage Withstand Test:
When de-energized, apply a power frequency voltage of 45 kV for 1 minute. No breakdown or flashover should occur.
◇Note: Before the test, disconnect the live display wiring and connect the output line of the supporting insulator or sensor. Do not use zinc oxide lightning arresters during the test.
◇Live Display Inspection:
When the voltage is increased to 5 kV, the indicator light should illuminate. When increased to 10 kV, the indicator light should be bright.
◆Installation Base
◇Prior to installing the branch box, the user should prepare the cable trench or well in advance.
◇The installation base for the cable junction box should be fabricated with welded channel steel and pre-embedded on a flat foundation.
European branch box installation structure
European-Type Branch Box – Connection Scheme
| Model | Wiring Scheme | Internal Arrangement | Dimensions |
| DFW10-2 |  |
 |
580×550×950 |
| DFW10-3 |  |
 |
700×550×950 |
| DFW10-4 |  |
 |
820×550×950 |
| DFW10-5 |  |
 |
940×550×950 |
| DFW10-6 |  |
 |
1060×550×950 |
| DFW10-7 |  |
 |
1180×550×950 |
| DFW10-8 |  |
 |
820×650×1000 |
| DFW10-9 |  |
 |
940×650x1000 |
Note:The branch box can be expanded or reduced as required, and the outer casing may be directly buried in the cable trench.
