This product is mainly used in indoor and outdoor 24 kV medium-voltage distribution networks as ring main switchgear for receiving and distributing electrical energy.
The product fully meets the standardized technical requirements of the State Grid for RMUs. It is suitable for side-extension and top-extension RMU configurations. The parts used in both top-mounted and bottom-mounted disconnector schemes are interchangeable by more than 90%, offering high product stability and strong compatibility. The product fully complies with type test requirements.
| No. | Item | Unit | Circuit Breaker Unit | |
| 1 | Rated voltage | kV | 24 | |
| 2 | Rated current | A | 1250 | |
| 3 | Rated frequency | Hz | 50/60 | |
| Temperature rise test | A | 1.1Ir | ||
| 4 | Power frequency withstand voltage (phase-to-phase & phase-to-ground/ across isolating gap) |
kV | 65/79 | |
| 5 | Lightning impulse withstand voltage (phase-to-phase & phase-to-ground/ across isolating gap) |
kV | 125/145 | |
| 6 | Rated short-circuit breaking current | kA | 25 | |
| 7 | Rated short-circuit breaking operations |
Times | 30 | |
| 8 | Rated short-time withstand current/ duration | kA/S | 25/4 | |
| 9 | Rated short-circuit making current | kA | 63 | |
| 10 | Degree of protection | Enclosure | IP4X | |
| Gas tank | IP67 | |||
| 11 | Rated filling pressure (at 20℃) | MPa | 0.04 | |
| 12 | Annual leakage rate | ≤0.01%/year | ||
| 13 | Mechanical endurance |
Circuit breaker/ Load break switch | Times | 10000 |
| Disconnector | 3000 | |||
| Earthing switch | 3000 | |||
| 14 | Overall dimensions |
Width | mm | 500 |
| Depth | 850 | |||
| Height | 2000 | |||
| Top-mounted disconnector and circuit breaker panel scheme |
Bottom-mounted disconnector and circuit breaker panel scheme |
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| Cabinet Width | 500mm | Cabinet Width | 500mm |
| Cabinet Depth | 850mm | Cabinet Depth | 850mm |
| Cabinet Height | 2000mm | Cabinet Height | 2000mm |
Ambient air temperature: maximum +40 °C, minimum –50 °C;
Relative humidity: daily average ≤95%, monthly average ≤90%;
Altitude ≤1500 m (under standard gas-filling pressure);
Seismic intensity not exceeding 8 degrees;
Installation site shall be free from fire, explosion, severe pollution, chemical corrosion, or severe vibration.
For operating conditions different from normal service conditions, an agreement must be reached between the manufacturer and the end user.
If the equipment is to be operated in particularly harsh environments, the manufacturer or supplier must be consulted.
When electrical equipment is installed at altitudes above 2000 m, this must be explicitly stated so that the gas tank structure can be adjusted during manufacturing.
GB/T 11022 – Common technical requirements for high-voltage switchgear and controlgear
GB/T 3906 – AC metal-enclosed switchgear and controlgear for rated voltages of 3.6–40.5 kV
GB/T 3804 – High-voltage AC load switches
GB/T 1985 – High-voltage AC disconnectors and earthing switches
GB/T 1984 – High-voltage AC circuit breakers
GB/T 4208 – Degrees of protection provided by enclosures (IP Code)
When placing an order, the user shall provide the following technical information:
Primary circuit diagram, arrangement diagram, and floor plan;
Secondary circuit schematic diagram of the switchgear;
Special environmental conditions for the switchgear (if applicable);
Specify whether a top-mounted or bottom-mounted disconnector scheme is required;
For gas tank orders, indicate whether top extension or side extension is required;
Other accessories as listed in the order options table.
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