Ring Main Unit Cable Branch Box, 12/24kV Outdoor Electric Meter Box
12/24kV Outdoor Ring Main Unit Cable Branch Box - Distribution Metering Box
Product Overview | DFT6-12/24 Series Cable Branch Box
The DFT6-12/24 Series Cable Branch Box is a new generation of outdoor power supply equipment designed for 12kV and 24kV power network cable systems. It is engineered for power acceptance and distribution, providing reliable cable connection, branching, and transfer functions in outdoor environments.
With a compact structure and aesthetically appealing enclosure, this ring main unit (RMU) cable branch box is especially suitable for locations with limited installation area and high environmental requirements, including:
- City streets
- Residential areas
- High-rise buildings
- Airports
- Wharfs / ports
Key Applications
The DFT6-12/24 series is used for:
- Connecting
- Shunting / branching
- Cable circuit continuation
- Transferring cable circuits outdoors
Optional: Wooden board inside the case enclosure - available upon customer request.
Service Conditions (Normal Operating Environment)
This outdoor distribution metering box is designed to operate reliably under the following conditions:
| Parameter |
Value |
| Altitude |
≤ 1000m above sea level |
| Ambient temperature |
-25°C ~ +40°C |
| Wind speed |
≤ 34 m/s |
| Regular severe vibration |
No |
Key Features - DFT6-12/24 Series
- Simple and reliable connection - easy installation
- Fully insulated and completely sealed structure - maintenance-free, dustproof, and waterproof
- Low initial investment - saves switchgear and cable costs
- Small footprint - easy integration with surrounding environment
Main Technical Parameters - FN26-12/24 SF6 Load Switch
| Parameter |
Unit |
12kV Value |
24kV Value |
| Rated Voltage |
kV |
12 |
24 |
| Rated Current |
A |
630 |
630 |
| Rated Short-time Withstand Current |
kA/s |
25/2 |
25/2 |
| Rated Peak Withstand Current |
kA |
63 |
63 |
| Rated Short-time Making Current |
kA/s |
50/2 |
63/2 |
| 1min Power Frequency Withstand Voltage |
kV |
42 |
65 |
| Lightning Impulse Withstand Voltage |
kV |
75 |
125 |
| Mechanical Endurance |
times |
10,000 |
10,000 |
| SF6 Gas Pressure (20°C gauge pressure) |
MPa |
0.04 |
0.04 |
| Leakage Rate / Year |
- |
≤1% |
≤1% |
Main Technical Parameters - Cable Terminal
| Parameter |
Unit |
12kV Value |
24kV Value |
| Rated Voltage |
kV |
12 |
24 |
| Rated Current |
A |
≤630 |
≤630 |
| Applicable Cable Cross Section |
mm² |
25 - 400 |
35 - 400 |
| Connection Point Resistance |
µΩ |
40 |
45 |
| Partial Discharge |
Pc/kV |
≤10 / 13 |
≤10 / 21.5 |
| Rated Thermal Stability Voltage |
kA/s |
20/3 |
25/2 |
| Rated Dynamic Voltage |
kA |
50 |
63 |
| 1min Power Frequency Withstand Voltage |
kV |
42 |
65 |
| Lightning Impulse Withstand Voltage |
kV |
75 |
125 |
Commonly Used Cable Conductive Cross-Sectional Areas (mm²)
35, 50, 70, 95, 120, 150, 185, 240, 300, 400, and others as required.
