7.1 Installation
7.1.1 Unload the breaker from the soleplate of package.
If it is drawout type, firstly pull out the handle under
the drawer-base of breaker, and plug it into the hole
on central part of plastic cover under the drawer-base
crossbeam, anticlockwise turns the handle, the body
will slowly slide along the outside of drawer-base.
7. Installation
7.1.2 Check the insulation resistance with a 500V megger,
resistance should not be less than 20MΩ when
ambient temperature is 20℃±5℃ and relative
humidity is 50%~70%. Otherwise dry it.
Possible positions
When the guide rod points to separated position and handle
can't be rotated any longer, pull out the handle and firmly
grasp the aluminum handle on drawer-base, pull out the
breaker body and remove it form the base, then move the
base from the sole plate and clean up the dirty things inside
the drawer-base.
7.1.3 Power supply
NA1 devices can be supplied either from the top or
from the bottom without reduction in performance,
in order to facilitate connection when installed in a
switchboard.
7.1.4 Put the breaker (fixed-type) or drawer-base (drawout-type)
into the installation-bracket, and make it fixed, directly
connect the cable wire of main circuit to the bus wire of
fixed-type circuit breaker. Alternatively put breaker body
onto the slideway of drawer-base. Plug the handle into
installation hole, clockwise turns it until the under-part of
drawer-base points at the connection position and ”click”
sound is heard. It indicates that breaker body has been
connected to its place, then connect the cable of main
circuit to drawer-base.
Mounting the circuit-breaker
It is important to distribute the weight of the device
uniformly over a rigid mounting surface such as rails
or a base plate.
This mounting plane should be perfectly flat (tolerance
on support flatness: 2 mm).This eliminates any risk of
deformation which could interfere with correct
operation of the circuit breaker.
NA1 devices can also be mounted on a vertical plane
using the special brackets.
C
NA1
Air Circuit Breaker
P-066
P-065
NA1
Air Circuit Breaker
non magnetic material
Busbars
The mechanical connection must be exclude the possibility
of formation of a magnetic loop around a conductor.
Mounting with vertical brackets
Mounting on rails
7.1.5 Partitions
Sufficient openings must be provided in partitions to ensure
good air circulation around the circuit breaker;
Any partition between upstream and downstream connections
of the device must be made of nonmagnetic material.
For high-currents, of 2500 A and upwards, the metal supports
or barriers in the immediate vicinity of a conductor ;Metal
barriers through which a conductor passes must not form
a magnetic loop.
A:non magnetic material
7.1.6 Busbar connections
The busbars should be suitably adjusted to ensure the
connection points are positioned on the terminals before
the bolts
B
are inserted. The connections are held by the
supporter which is fixed to the framework of the
switchboard, in this way the circuit breaker terminals
do not have to support its weight C.
(This support should be placed close to the terminals).
A
B
C
B
A
A
Summary of Contents for NA1
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Page 2: ...Air Circuit Breaker Leading every step reliable new height ...
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