CHINT NXB-63G Series Installation instructions

NO:2023.08
Standard: IEC/EN 60947-2
User Instruction
NXB-63G Series
Moulded Case Circuit Breaker

Installation in any damp, condensed-phase environment with
inflammable and explosive gas is forbidden. It is strictly
prohibited to operate the product with wet hands.
You are prohibited from touching the conductive part when the
product is operating.
It is strictly prohibited to test the performance of the product by
the direct contact of the hot wire against the grounding device or
the direct short circuit of the hot wire and the neutral wire.
When the product is being installed or maintained, the power
must be switched off.
The protection features of the product are set by the
manufacturer. It is not allowed to open or adjust the circuit
breaker at will.
The product must be wired and installed by qualified personnel
and be checked regularly.
It is prohibited to let children play with the product or the
package.
Prevent foreign objects from falling into the product.
Do not install the product at places where gas media can cause
metal corrosion and insulation damage.
Tighten the wiring screws when installing the product to prevent
wires from loose or being pulled out. Select wires strictly
according to instructions and connect them to proper power
supply and load.
This product does not provide protection for electric shock and
electricity unbalance.
Safety Warning
1
2
3
4
5
6
7
8
9
11
10

01
Installation
3
1. Outline and installation dimensions
Unit:mm
Purpose of Use
1
Key Technical Parameters
2
The NXB-63G series moulded case circuit breakers are applicable to
circuits with frequency of AC 50/60 Hz, rated voltage up to 240/415 V and
rated current up to 63A. They provide overload and short circuit protection,
and can also be used for infrequent switching of the circuit under normal
circumstances.
Table 1 Key Technical Parameters
Rated Working voltage (Ue)
Rated limit short-circuit
breaking capacity (Icu)
Altitude
Pollution level
Installation category
Enclosure protection class
Standard
AC240 V (1P)
AC415 V (2P, 3P, 4P)
6000A
≤ 2,000m
Level 2
Class II and III
IP20
IEC/EN 60947-2
Rated insulation voltage (Ui)500V

02
2. On-off indication
3. Installation
4. Disassembly
TH35-7.5 type mounting rail
7.5
35
27

L
12.5mm
S
16mm 2
S
25mm 2
03
5. Wiring: copper wires only
Rated current (In) (A) 2
Copper wire cross-sectional area mm
Table 2 Copper wire cross-sectional area
1-6 1
10 1.5
16, 20 2.5
25 4
32 6
40, 50 10
63 16
6. Operation Instruction
It is recommended to carry out the closing operation from the middle of the
handle.

04
Maintenance
4
1.Check the circuit breaker on a regular basis during operation;
2.After the circuit breaker cuts off the overload or short-circuit current, the
fault should be eliminated before closing the circuit breaker.
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 3 Analysis and troubleshooting of common faults
Symptoms Cause analysis Troubleshooting method
Short circuit at load end
Fault occurs to the operating
mechanism.
The rated current of the
circuit breaker does not match
the load current
The wire is loose or not
properly fixed by wiring screws.
The cross-sectional area of the
selected wire is too small
Eliminate the fault
Replace the product
Replace with product of
proper specifications
Tighten the wiring screws
Replace with wire of
proper specifications
The handle cannot
close the circuit
breaker
Temperature is
too high.
No power
The wire strip length is too short. Re-strip the wire
The wire is loose or not properly
fixed by wiring screws. Tighten the wiring screws

QC PASS
Test date: Please see The packing
ZHEJIANG CHINT ELECTRICS CO.,LTD.
NXB-63G Series
Moulded Case Circuit Breaker
IEC/EN 60947-2
Check 52
05

NXB-63G Series
Moulded Case Circuit Breaker
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: [email protected]
Website: http://en.chint.com