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Low-voltage switchgear, Distribution Board
low voltage distribation cabinet low voltage switch cabinet
GB7251.1-2005
Low-voltage Distribution Box, switch cabinet
Service condition
1. Ambient temperature: -15'C~+40'C
2. Altitude: <=1000m
3. Air humidity:
daily average of Air humidity <=95%, daily average of partial vapor pressure <= 2.2kPa;
monthly average of Air humidity <=90%, monthly average of partial vapor pressure <= 1.8kPa
4. Earthquake intensity <= 8 degree
5. No corrosive or flammable gas
Special condition subject to users
Features and Benefits
1. 3 to 35kV rated maximum voltage.
2. Easy-to-read controls and indicators, an easily inspected primary disconnect, contact erosion indicator and precisely tooled breaker mechanisms. A lower compartment roll-in breaker is available for indoor or walk-in outdoor switchgear.
3. Simplified maintenance and training. For example, all breakers are the same size, and most frame parts, primary conductors, disconnects and mechanisms are interchangeable.
4. The main bus compartment is completely isolated by 11 gauge metal barriers. Bus bars insulated with high dielectric epoxy pass through trackresistant polyester glass barriers between cubicles.
5. The secondary disconnect combines the contact reliability of a plug with the self-aligning convenience of sliding contacts.
6. Current transformers are located behind mechanically actuated safety shutters and a barrier that isolates the primary disconnect as the breaker is moved into the disconnect position.
7. Voltage transformer trays are automatically grounded on withdrawal, which provides isolation from primary connections.
8. Dry type control power transformers are insulated with molded resin epoxy and mounted in a drawout tray for easy access.
9. Even two-breaker vertical sections offer ample space for terminating up to two 750 MCM cables per phase.
10. ABB, Schneider, GE circuit breaker optional.
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