CHINT NA1-1000, Catalogue

Page: 27 / 64

. 2 1 . . 2 0 .
Air Circuit Breaker
Examples
Type of screw
M4
M10
M12
Application Preferred tightening torque
Screws for secondary terminals
Installing bolts of Air Circuit Breaker
Connection terminals
11Nm
45Nm
50Nm
1 2 3 4
5
1 breaker terminal
2 busbar
3 bolt
4 washer
5 nut
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.
Preferred tightening torque for NA1's tightening components
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.
Connected position Test position Disconnected position Drawout position
1.Both main circuit and control
circuit are connected.
2.Normal application conditions
1.The main circuit is disconnected,
and the control circuit is connected.
2.Test application conditions.
Neither the main circuit
nor the control circuit is connected.
Main body is out
of the drawer seat.
Arcing chamber
Secondary connecting part
Main body
Handle Slideway
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