CHINT NR8-200 Installation instructions

NO:2020.05
Standard: IEC/EN 60947-4-1
User Instruction
NR8-200、NR8-630
Electronic Overload Relay

Safety Warning
1
2
3
4
Only professional technicians are allowed for installation and maintenance.
Installation in any damp, condensed-phase environment with inflammable
and explosive gas is forbidden.
When the product is being installed or maintained, the power must be
switched off.
You are prohibited from touching the conductive part when the product is
operating.

1
2
Use Purpose
NR8-200, NR8-630 electronic overload relay (hereinafter referred to as relay) is applicable to circuits
with frequency of AC 50Hz or 60Hz, rated operating voltage up to 690V and current from 80A to 630A. It is
used for overload protection and phase-failure protection of 3-phase AC motor. It can also be used with
corresponding contactor to act as magnetic starter.
Main Technical Parameters
01
NR8-200、NR8-630 Electronic Overload Relay
Table 1 Environmental conditions
Ambient temp. (℃)
Hot and humid atmospheric conditions
Altitude
Pollution class/installation category
-5℃~+40℃, average temperature should not exceed +35℃ within 24h
Relative humidity should not exceed 50% at +40℃; up to 90% at +20℃;
No influence below 2000m
Class 3/III
2.1 See Table 1 and Table 2 for product technical parameters.
Environmental conditions
Table 2 Technical parameters
Model
Phase-failure protection
Reset function
Release indication
Test function
Emergency stop function
Setting current range (A)
Matching contactor
Auxiliary contacts
Rated insulation voltage Ui
Rated operating voltage Ue
Rated impulse withstand voltage Uimp
Yes
Manual reset
Yes
Yes
Yes
NR8-200 NR8-630
Yes
Manual reset
Yes
Yes
Yes
1NO+1NC
690V
660V/690V and below
6kV
5A
220V/230V 2.5A; 380V/400V 1.5A
220V 0.2A
IP00
80-160 100-200 125-250 200-400 315-630
NC8-115 175～NC8-205 500～
Protection class
Ith
AC-15
DC-13
Auxiliary circuit

NR8-200、NR8-630 Electronic Overload Relay
02
1 1.2 1.5 2 4 6 8 10 I/Ie
t(s)
1000
800
600
400
200
100
80
60
40
20
10
8
6
4
2
1
2.2 See Figure 1 for relay operation time - current characteristic curve (3-phase, thermal state)
Figure 1 Relay time - current characteristic curve
3
Installation
3.1 Installation
Figure 2 Product overall dimensions (NR8-200)
95 96 97 98
NC
NO
100
120
140
160
180
200 Stop
Test
Reset
NR8-200
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
104±0.35
128±0.7
134±0.7
104±0.35
141.2±0.9
M8
Unit: mm

03
NR8-200、NR8-630 Electronic Overload Relay
Figure 3 Product overall dimensions (NR8-630)
Unit: mm
100
120
140
160
180
200
95 96 97 98
NC
NO
Stop TestReset
NR8-630
1/L1 3/L2 5/L3
2/T1 4/T2 6/T3
128±0.4
156±0.7
155±0.7
104±0.35
161±0.9
M10
Table 3 Wiring torque reference
M8
10N.m
M10
20N.m
M3.5
1.2N.m
NR8-200
NR8-630
NR8-200
NR8-630
2
mm 2 mm
2
mm 2 mm 2 mm
2
mm
25～95
50~2×185
0.75~2.5 0.75 2.5~ 0.75 2.5~ 0.75 2.5~ 0.75 2.5~ 0.75 2.5~
A＞3.5mm,L＜8mm
S

NR8-200、NR8-630 Electronic Overload Relay
04
3.2 Operation and commissioning
Figure 4 Installation and commissioning diagram
100
120
140
160
180
200
Stop
NO
Test
Reset
NO
100
120
140
160
180
200
95 96 97 98
NC
NO
Stop
Test
Reset
Test functiom
96
98
95
97
T
est
Reset
97
95
98
96
96 95
Manual reset
function
Continuously
adjustable current
range
Emergency stop function
Green light Red light
Indicator status Circuit working status
Normal
Overload delay
Phase-failure delay
Green light flashing, red light off
Green light flashing, red light on
Green light on, red light flashing
4
Maintenance
Clean the dust on the electronic overload relay timely. Conduct product test and maintenance every
half a year to ensure the smooth operation of the product and the good contact of NO and NC contacts.
Tighten the terminal screws with specified torque and align the load protection capability of the electronic
overload relay according to commissioning requirements.
Please be careful when handling and installing the relay. It is prohibited to move the product by crane
so that the product will not be damaged and its protection characteristics will not be changed due to
strong impact.
Table 4 Indicator status

NR8-200、NR8-630 Electronic Overload Relay
05
Table 5 Analysis and Troubleshooting of Faults
Cause anaylsis Troubleshooting method and precautionsSymptoms
Change to product with bigger size.
Size is too small
Fine tune the cam clockwise so that the set current
matches the actual motor current.
The set current value is smaller than the actual
operating current of the motor.
Misoperation
of thermal
relay without
the motor
being
overloaded
Thermal
relay
does not
operate.
Thermal
relay does
not work.
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.
Check installation status and conduct
troubleshooting. Do not place the product in
environment with strong shock or vibration.
Strong shock or vibration
Change to product with smaller size.
The size is too big
Fine tune the cam counter-clockwise so that the set
current matches the actual motor current.
The set current value is bigger than the actual
operating current of the motor.
Press the reset button to reset the relay.
Replace thermal relay.
Replace thermal relay.
The product is not reset.
Auxiliary contacts are not powered-on.
Main circuit or auxiliary circuit is burnt.

QC PASS
Test date: Please see the packing
ZHEJIANG CHINT ELECTRICS CO., LTD.
NR8-200、NR8-630
Electronic Overload Relay
IEC/EN 60947-4-1
Check 23
07
NR8-200、NR8-630 Electronic Overload Relay

NR8-200、NR8-630
Electronic Overload Relay
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