MNS Low-Voltage Withdrawable Switchgear
Category:
Description:
Product Introduction
This series of low-voltage withdrawable switchgear is a modular cabinet type assembled in the factory using standardized components (FBA). It is suitable for use in power plants, substations, petrochemical facilities, metallurgical and steel mills, transportation and energy sectors, light industry and textile enterprises, as well as residential communities and high-rise buildings. It serves as distribution equipment for electrical power systems operating at 50–60 Hz with rated working voltages of 660 V or lower, used for power conversion, distribution, and control.
Model Meaning
Operating environment
▷ The ambient air temperature shall not exceed +40℃, nor fall below -5℃, and the 24-hour average temperature shall not exceed +35℃.
▷ The surrounding air shall be clean, with relative humidity not exceeding 50% at the maximum temperature of +40℃. At lower temperatures, higher relative humidity is permissible—for example, up to 90% at +25℃—but it should be noted that moderate condensation may occasionally occur due to temperature fluctuations.
▷ For indoor use only, at altitudes not exceeding 2000m.
▷ In places with no significant shaking or impact vibrations.
▷ Pollution level: Level 3.
▷ Seismic intensity: Grade 8.
▷ The temperature during the transportation and storage of switchgear can range from -25°C to 55°C; for short periods (no more than 24 hours), the temperature may reach up to +70°C.
▷ If the above-mentioned usage conditions cannot be met, the user and the manufacturer shall negotiate a solution.
Product Features
▷ Compact design: Allows more functional units to be accommodated within a smaller space;
▷ Highly versatile in structure and flexible in assembly: C-shaped profiles with a 25mm modulus can meet the requirements of various structural forms, protection levels, and operating environments.
▷ Standard modular design: The components can be assembled into standard units for protection, operation, switching, control, regulation, indication, and more; users can freely select and assemble them according to their specific needs.
▷ High technical performance: Key parameters reach the current international technological standards;
▷ Compact site: Highly standardized, significantly reducing the space required for storing and transporting prefabricated components.
▷ Easy assembly: no special complexity required;
Technical Parameters
Serial number |
Name |
GB7251.1-2005 Low-Voltage Switchgear and Controlgear Assemblies (TTA) |
|
IEC60439 "Low-Voltage Switchgear and Controlgear Assemblies" |
|||
1 |
Overvoltage Category |
IV III |
|
2 |
Pollution Level |
3 |
|
3 |
Rated operating voltage (Ue) (V) |
400/660 |
|
4 |
Rated Insulation Voltage (Ui) (V) |
660/1000 |
|
5 |
Rated frequency (Hz) |
50(60) |
|
6 |
Horizontal busbar |
Rated current |
<5000A |
7 |
Rated short-time withstand current (lcw) (kA) |
50, 65, 80 (effective value of ls) |
|
8 |
Rated peak withstand current (lpk) (kA) |
105, 140, 176 (maximum value: 0.1s) |
|
9 |
Vertical B busbar |
Rated maximum operating current |
<1000A |
10 |
Rated short-time withstand current |
50kA |
|
11 |
Rated Domain Value Withstanding Current |
105kA |
|
12 |
Enclosure protection rating |
IP30 IP40 (Special Note) |
|
Keywords:
MNS Low-Voltage Withdrawable Switchgear
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