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Compact NSX circuit breakers equipped with Micrologic AB trip units are installed as
incoming devices for consumer installations connected to the public LV distribution
With respect to the utility, they have two functions.
** Consumption is limited to the contractual power level. If the limit is exceeded, a
fast thermal-protection function trips the device at the head of the consumer's
installation without the utility having to intervene.
** Total discrimination is ensured with the upstream fuses on the public distribution
system in the event of a fault, overload or short-circuit in the consumer's installation,
protecting the utility line.
In addition, they provide the consumer with:
** protection for the installation as a whole, with the possibility of adding a Vigi
earth-leakage protection module
** the possibility of downstream discrimination.
This type of Compact NSX is often used in conjunction with an Compact INV
switch-disconnector located outside the consumer's building and providing the
This means the operator can directly see, through a transparent cover, the physical
separation of the main contacts. The Compact INV range is also suitable for isolation
with positive contact indication.
This means utility operators can work on the service-connection unit after isolating it
from the upstream line.