CHINT NCH8 Series Installation instructions

NO:2020.04
Standard:IEC/EN 61095
NCH8 Series
Modular AC Contactor
User Instruction

Safety Warning
1
2
3
4
Only professional technicians are allowed for installation and
maintenance;
It is strictly prohibited to install in the environment containing
inflammable, explosive gas and moist condensation.
Power must be turned off when installing, maintaining and
maintaining the product.
Do not touch the conductive part of the product during
working.

1
2
01
NCH8 series modular AC contactor is mainly used in AC 50Hz (60Hz)
power systems with rated operating voltage up to 400V and rated operating
current up to 63A. The product is used as remote switch and control circuit
under AC-1/AC-7a application category (non-inductive or low inductive
load/resistance furnace,domestic appliance and low inductive load of similar
applications). The contactor can also be used for AC-7b application category
(household motor load), but it must be derated.
The contactor is not designed to break short circuit current, therefore it
should be used with a matching short circuit protector.
Purpose of Use and Range of Application
Main Technical Parameters and Performance
Table 1 Main parameters and technical
performance index of the contactor
Model
Rated insulation
voltage Ui(V)
Rated impulse withstand
voltage Uimp(kV)
Conventional thermal
current Ith(A)
NCH8
-20 2P
NCH8
-20 4P
NCH8
-25 2P
NCH8
-25 4P
NCH8
-40 2P
NCH8
-40 4P
NCH8
-63 2P
NCH8
-63 4P
Rated
operating
current Ie(A)
500
4
25 63
AC-1/AC-7a
AC-7b
20
9
25
9
40
15
63
20
Rated voltage Ue(V) 230 400 230 400 230 400 230 400
Operation
frequency
(time/h)
AC-1/AC-7a
AC-7b
360
180360
Electrical life
(10000 times) AC-1/AC-7a 10
Mechanical life
(10000 times) 100

02
Model NCH8
-20 2P
NCH8
-20 4P
NCH8
-25 2P
NCH8
-25 4P
NCH8
-40 2P
NCH8
-40 4P
NCH8
-63 2P
NCH8
-63 4P
Coil control power
voltage Us(V) 24、220/230、240
85% 110%Us~
20% 75%Us~
Operation
range
Pick-up
voltage
Release
voltage
Enclosure protection
degree
Rated duty system
Ambient temperature
Humidity
Altitude
Pollutin class
Installation category
IP20
8-hour duty, uninterrupted duty, intermittent periodic duty
-5℃~+40℃
relative humidity 50% at +60℃; up to 90% at +20℃＜
No influence below 2000m
Class 2
II
3
Installation
1) See Table 2 for outline and installation dimensions.
Table 2 Overall and installation dimensions of NCH8
DL L1 L2 H H1
NCH8-20~25
NCH8-40~63
18
36
36
54
85
85
35.5
35.5
45
45
66.5
66.5
50
50
Model 2 poles 4 poles
Unit:mm

03
D 9
H
H1
L2
L1
D
L
Figure 1 NCH8
Unit:mm
Figure 2 Installation dimensions of partition
Unit:mm

04
Figure 3 NCH8 installation diagram
2) Installation method: use TH35-7.5 steel mounting rail, see Figure 3
below.
① ②
③
NCH8-20~25 2P
3) Wire selection and connection method: applicable to copper wire
connection, please refer to Table 3 below for wire category, sectional area,
strip length and tightening torque, see Figure 4 below for connection
method.

05
Table 3 Connection requirements for copper wire
A
B
A1
A2
M3.5
0.8N.m
C D E F G H
12 mm
10 .5 mm
Model
Co de
NC H8 -2 0
NC H8 -2 5
NC H8 -4 0
NC H8 -6 3
A
M3 .5
M5
B
0. 8N .m
2. 0N .m
1~ 4
C
1~ 4
2. 5~ 16
1~ 2. 5
D
1~ 2. 5
2. 5~ 6
1~ 4
E
1~ 4
2. 5~ 16
1~ 2. 5 1~4 1~ 2. 5
F G H
1~ 2. 5
2. 5~ 6 2. 5~ 16 2. 5~ 6
1~ 4 1~ 2.5
Note: You can connect up to 2 wires with same type and sectional area.
1 3
2 4
A1 1 3
A2 2 4
NC H8 -20~63/20
A1 1 R1
A2 2 R2
NC H8 -20~63/11
A1 R1 R3
A2 R2 R4
A1 1 3 5 7
A2 2 4 6 8
NC H8 -20~63/02 NC H8 -20~63/40
A1 R1 R3
A2 R2 R4
1 3
2 4
NC H8 -20~63/22
A1 R1
A2 R2
A1 1
A2 2
A1 R1 1 3 5
A2 R2 2 4 6
NC H8 -20~25/01 NC H8 -20~25/10 NC H8 -20~63/31
1
A2 2 4
A1 3
Figure 4 NCH8 connection method
2
Unit:mm

06
4
Maintenance
Check the operation of the contactor every month. Method: The
contactor should incline 5° forward upon picking up and 5° backward upon
release; check if the contactor can operation smoothly.
Conduct inspection and maintenance every month. Note: The product
should not be assembled, disassembled or maintained at will. Please
replace the product if it is damaged.
Table 4 Analysis and Troubleshooting of Faults
Symptoms Cause analysis Troubleshooting method
No operation
or operation
is not reliable
The control power voltage does
not comply with coil voltage.
Use control power that has the
same voltage as the coil
Insufficient operation circuit
power capacity; disconnection or
wrong connection occured.
Check the circuit to ensure correct
connections
Coil is burnt; movable
mechanical parts are jammed Replace the product
Noise
There is foreign objects on the
polar face of magnet yoke ora
rmature
Replace the product
The control power voltage is too
low.
Use control power that has the
same voltage as the coil
Contact welding Replace the product
There is stain or dust on the
polar face of the iron core. Replace the product
The contactor
does not
release or
release slowly
5
Environmental Protection
In order to protect the environment, the product or product parts
should be disposed of according to the industrial waste treatment process,
or be sent to the recycling station for assortment, dismantling and recycling
according to local regulations.

QC PASS
Test date: Please see the packing
ZHEJIANG CHINT ELECTRICS CO., LTD.
NCH8 Series
Modular AC Contactor
IEC/EN 61095
Check 10
07

NCH8 Series
Modular AC Contactor
User Instruction
Zhejiang Chint Electrics Co., Ltd.
Add: No.1, CHINT Road, CHINT Industrial Zone,North Baixiang,
Yueqing, Zhejiang 325603,P.R.China
E-mail: [e-mail]
Website: http://en.chint.com