CHINT NRE8 Series Installation instructions

NO:2020.04
Standard: IEC/EN 60947-4-1
NRE8 Series
Electronic Overload Relay
User Instruction

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
3
4
Safety Warning

01
Use Purpose
1
NRE8 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 0.6 to 100A. It is used for overload
protection and phase-failure protection of long-term operating or
intermittent operating AC motor.
Key Technical Parameters
2
Table 1 Environmental conditions and
technical parameters of main circuit
Environmental conditions
Ambient temp. (℃)
Hot and humid
atmospheric conditions
-5℃~+40℃, average temperature should not
exceed +35℃ within 24h
Relative humidity should not exceed 50% at
+40℃; up to 90% at +20℃;
Pollution class/installation category
Altitude No influence below 2000m
Class 3/Ⅲ
Technical parameters of main circuit
No.
1
2
3
4
5
6
7
8
Model
Frame size
rated
current A
Rated
current
A
Adjustment
range of setting
current A
Fuse
gG Amax
1.2
2.4
4
8
10
12
20
25
0.6~1.2
1.2~2.4
2~4
4~8
5~10
7~12
10~20
20~25
4
6
10
16
20
25
40
50
NRE8-25 25

02
No.
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Model
Frame size
rated
current A
Rated
current
A
Adjustment
range of setting
current A
Fuse
gG Amax
25 22~32
0.6~1.2
1.2~2.4
2~4
4~8
5~10
7~12
10~20
19~38
2~4
4~8
5~10
10~20
20~40
30~65
50~100
32
1.2
2.4
4
8
10
12
20
38
4
8
10
20
40
65
100
80
4
6
10
16
20
25
40
80
10
16
20
40
80
160
200
NRE8-25
38NRE8-38
40NRE8-40
100NRE8-100
Table 2 Technical parameters of auxiliary circuit
AC-15 DC-13
230
2.5
400
1.5
220
0.2
5
Rated operating voltage V
Rated operating current A
Conventional thermal current A
Application category

03
Table 3 Technical parameters and performance
Content
Rated insulation voltage of main circuit Ui(V)
Rated insulation voltage of auxiliary circuit Ui(V)
Rated frequency (Hz)
Rated impulse withstand voltage Uimp (kV)
Enclosure protection class
AC690
AC400
50/60Hz
6kV
IP20
No. Parameters
1
2
3
4
5
6
Rated duty system, specify intermittent duty
level (if any)
8 hour duty system or
uninterrupted duty system
Item
Electrostatic discharge tolerance
Radio frequency electromagnetic
field tolerance
Fast transient tolerance
Surge tolerance
Table 4 Anti-interference parameters
Level
±8kV (air discharge) ±10%
Test electric field intensity 10 (V/M) ±10%
To control circuit 2kV, duration: 1min
Test voltage 2.0kV

04
1---Cold state 2---Thermal state
1 2 4 6 8 10 I/Ie
1
2
4
6
8
10
20
40
60
80
100
200
400
600
800
1000
t(s)
2
1
Figure 1 Relay time - current characteristic curve

05
Installation
3
1) Installation
Figure 2 Overall and installation dimensions of NRE8-25
Unit: mm
Figure 3 Overall and installation dimensions of NRE8-25/F
(with mounting bracket)
Unit: mm
66
45max
35.5 91max
83
35
1 L1 3 L2
NRE8-25
28 32
24
22 40
36
95 NC 96 97 NO 98
4 T2 6 T2
Stop
Test
Reset
81.5max
61.5
77.4max
46max
26.3/27.6
20
2 T1 4 T2 6 T3
NRE 8-25
28 32
24
22 40
36
95 NC 96 97 NO 98
Stop
Test
Reset

06
Figure 4 Overall and installation dimensions of NRE8-38
Unit: mm
Figure 5 Overall and installation dimensions of NRE8-40
93max
70
85max
NRE8-40
28 32
24
22 40
36
95 NC 96 97 N O 98
Stop
Test
Reset
4
2 T1 T2 6 T3
55max
1 7
2 0
1 7
81.5max
14.5±0.5 14.5±0.5
12.2±0.2
46max
47.3±0.3
71.5max
Unit: mm

07
Figure 6 Overall and installation dimensions of
NRE8-40/F (with mounting bracket)
Unit: mm
Figure 7 Overall and installation dimensions of NRE8-100
3
104max
35
94max
45
55max
77
NRE 8-40
T1 4T2 T 3
6
28 32
24
22 40
36
95 NC 96 97 NO 98
L11 L2
Stop
Test
Reset
Unit: mm
20/23.5 20/23 . 5
22.8/27.1
101max
74.6
NRE8- 100
2 T1 4 T2 6 T3
70 80
90
100
50
60
95 NC 96 97 NO 98
Stop
Test
Reset

Figure 8 Overall and installation dimensions of NRE8-100/F
(with mounting bracket)
Unit: mm
Table 5 Wiring capacity of terminals
08
72max
61.5
105
35.5
118max
2
mm 2 mm 2 mm 2 mm 2 mm 2 mm
M3.5
1.2 N.m
M4
1.7 N.m
M5
2.5 N.m
M10
10 N.m
NRE8
Series
0.75~2.5
NRE8-25
NRE8-38
1~10
NRE8-40 – – 4~10
NRE8-100 – – 6~35 – –
A＞3.5mm,
L＜8mm
A
L
A＞3mm,
L＜10mm
A
L
A＞5mm,
L＜12mm
A
L
4~10 4~10 4~10
6~35
1~10 1~10 1~10 1~10 1~10
0.75~2.5 0.75~2.5 0.75~2.5 0.75~2.5 0.75~2.5

Figure 11 Relay panel layout
09
2) Operation and commissioning
Green
light
Red
light
Mannal reset
function
96
98
95
97
98
96
97
95
96 95
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
Test funcion
Continuously
adjustable current
range
Emergency
stop function

10
Maintenance
4
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. (See Figure 12)
Please be careful when handling and installing the thermal relay. It is
prohibited to move the product by crane with strong impact so that the
product will not be damaged and its protection characteristics will not
change.
Figure 12 Maintenance diagram of relay panel
Test the
mechanism on a
regular basis
Test load protection
capability on a
tegular basis
Tighten the screws

11
Environmental Protection
5
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.
Table 6 Analysis and Troubleshooting of Faults
Symptoms Cause analysis Troubleshooting method and precautions
Misoperation
of thermal
relay without
the motor
being
overloaded
Thermal relay
does not
operate.
Size is too small.
Change to product with bigger size.
The set current value is
smaller than the actual
operating current of the
motor.
Fine tune the cam clockwise so that the set
current matches the actual motor current.
Check installation status and conduct
troubleshooting. Do not place the product
in environment with strong shock or
vibration.
Strong shock or
vibration
The size is too big. Change to product with smaller size.
The set current value is
bigger than the actual
operating current of the
motor.
Fine tune the cam counter-clockwise so
that the set current matches the actual
motor current.
Thermal
relay does
not work.
The product is not reset. Press the reset button to reset the relay.
Auxiliary contacts are
not powered-on.
Main circuit or auxiliary
circuit is burnt.
Replace thermal relay.
Replace thermal relay.

QC PASS
Test date: Please see the packing
ZHEJIANG CHINT ELECTRICS CO.,LTD.
NRE8 Series
Electronic Overload Relay
IEC/EN 60947-4-1
Check 24
13

NRE8 Series
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