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Separate Switch Disconnector enclosure

fiftyhertz
Morning All, 


Why would you use a separate switch disconnector enclosure ie Schneider SEA9PNI2504, the vast majority of distriubtion boards i see have an incomer device at the base of the busbar, which could also be used as a protective device. Never really understood why a separate unit would be required?


Is there a practical reason im missing.


Thanks
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    Sometimes isolation is wanted in other places as well as the DB - e.g. local to equipment or at the origin of the installation so downstream DBs could be completely isolated for maintenance or replacement or perhaps before some other means of distribution - such as a bus-bar chamber.

       - Andy.
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    Sometimes isolation is wanted in other places as well as the DB - e.g. local to equipment or at the origin of the installation so downstream DBs could be completely isolated for maintenance or replacement or perhaps before some other means of distribution - such as a bus-bar chamber.

       - Andy.
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