7.1.8 Clamping
Correct clamping of busbars depends on the tightening
torques used for the nuts and bolts,etc. Over-tightening
may have the same consequences as under-tightening.
For connecting busbars to the circuit breaker, the tightening
torques to be used are shown in the table below. These
values are for use with copper busbars and steel nuts and
bolts, class ≥8.8.
1
2
3
4
5
1 breaker terminal
2 busbar
3 bolt
4 washer
5 nut
Examples
6
6 spring washer
Type of screw
M3
M10
M12
Application
Preferred tightening torque
Screws for secondary terminals
Installing bolts of Air Circuit Breaker
Connection terminals
Preferred tightening torque for NA1's tightening components
0.5~0.7 N · m
38~55 N · m
61~94 N · m
7.1.7 Main circuit adopts cable connection
Users should not apply too strong mechanical strength on
the terminals of Air Circuit Breaker. Extend the bus-bar of
circuit breaker with connecting bus-bar, position the wiring
piece of cable before inserting bolts; the cable should be
fixed on the frame of distributing cabinet firmly.
min
18
min
18
Connected position
1.Both main circuit and control
circuit are connected.
2.Normal application conditions
Test position
1.The main circuit is disconnected,
and the control circuit is connected.
2.Test application conditions.
Disconnected position
Neither the main circuit
nor the control circuit is connected.
Drawout position
Main body is out
of the drawer seat.
7.2 Wiring the secondary circuit according to electric principle
diagram.
Note: Bolts, nuts, gaskets shouldn't be left inside the drawer
seat to avoid being blocked.
7.3 Operation
Check the rated voltage of the following components
whether conforms to the power voltage . Such as under
voltage release, shunt release, closing electromagnet,
motor-driven mechanism and intelligent controller.
7.4 Maintenance
Check the technical parameters in time or add some
lubricating oil, etc.
This breaker structure is arranged vertically and modularized
composition with each functioncell separated, which make
the maintenance easy.
It has compact structure, reliable operation and strong free
maintenance capability. Please check the technical parameters
on the nameplate in accordance with the requirements of
order before installation.
Arcing chamber
Secondary connecting part
Main body
Handle
Slideway
Drawer seat
Manual energy-storage
Shake with the manual energy-storage handle
up and down about six times to "click".
Making the secondary circuit power, the motor-driven
mechanism can store energy automatically until hearing the click
and energy stored indicating on the panel.
Otherwise press the storage handle for 6 times until hearing
the click and the indicator display energy stored
And the closing operation can be realized either by closing
electromagnet or manual button.
C
NA1
Air Circuit Breaker
P-068
P-067
NA1
Air Circuit Breaker
Summary of Contents for NA1
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