CHINT NB2-40ZT Installation instructions

NB2-40ZT Miniature Circuit Breaker With Remote
Control Function
User Instruction
英文使用说明书
0463B1656
01
浙江正泰电器股份有限公司
2023 年4 月

Safety Warning
1) It is strictly prohibited to install the product in an environment containing flammable and explosive
gases, wet condensation, and wet hand operation.
2) It is forbidden to touch the conductive part of the product during the operation of the product.
3) It is forbidden to test the product performance by using the method that the live wire directly touches
the grounding device, or the live wire is directly shorted to the neutral wire.
4) When installing, repairing and maintaining the product, it is necessary to ensure that the circuit is
powered off.
5) The protection characteristics of the product shall be set by the manufacturer, and it is not allowed to
disassemble or adjust at will.
6) The product must be wired and installed by qualified personnel, and checked regularly.
7) Children are not allowed to play with products or packaging.
8) Foreign matters shall be prevented from falling into the product.
9) Do not install it where the gas medium can corrode metal and damage insulation.
10) When the product is installed and used, the wiring screws should be tightened, and the wires are not
easy to loosen and pull out. The wires should be selected strictly according to the requirements and matched
with the required power supply and load.
11) This product cannot protect the electric shock hazard caused by contacting two wires of the protected
circuit at the same time.
12) Please strictly install the wiring diagram for correct wiring of this product.
13) This product is not suitable for direct starting of high inductive and capacitive loads such as fans,
motors, electric heating equipment and capacitor cabinets.
1Main purpose and scope of application
This product is applicable to the circuit with AC 50Hz, rated voltage of 230/400V, and rated current of
40A. It plays the role of overload, short circuit, overvoltage, and undervoltage protection. It can also be used
for infrequent on-off of the circuit under normal conditions.
The product also has remote control, electrical parameter (voltage, current, power) measurement functions,
and can be networked with external devices through RS485 communication interface or Bluetooth

2 Normal use, installation, transportation and storage conditions
2.1 Service conditions:
- Working environment temperature: - 25 ℃~+70 ℃, and the average working temperature for 24 hours
shall not exceed+35 ℃;
- Altitude: the altitude of the installation site shall not exceed 2000m;
- Pollution level: Level 2;
- Protection grade: IP20;
- Installation category: Class II.
2.2 Installation conditions:
The circuit breaker shall be installed vertically without obvious shaking, shock and vibration under the
conditions of meeting safety warnings.
2.3 Transportation and storage conditions:
the circuit breaker shall not fall or be attacked by rain or corrosive gas during storage and transportation.
3 Main technical parameters
3.1 Main technical performance indicators
Table 1 Main Technical Performance Indexes
S/N
Parameters or performance
Parameter value or performance value
1 Product model ZT: with RS485 communication;ZW: with
RS485 and Bluetooth communication
2 Compliance with standards IEC/EN 60898-1
3 Rated voltage (Ue) AC230/400V
4 Rated current (In)
6A
、
10A
、
16A
、
20A
、
25A
、
32A
、
40A
5
Number of poles
1P
6 Instantaneous tripping curve C
7 Rated short-circuit capacity (Icn) 6000A
8 Operating short-circuit breaking capacity (Ics) 6000A

9 Electrical life 6000 times
10 Mechanical life 10000 times
11 Reference temperature 30 ℃±2℃
12 Remote control
Closing time (tc) ≤3s
Opening time (to) ≤2s
13
Overvoltage protection
(can be opened and
closed)
Setting value of
overvoltage action
(Uvo)
The default value is AC280V ±5V, which
can be set
Overvoltage recovery
value (Uvor)
The default value is AC250V, which can be
set
Minimum non driving
time of overvoltage
The default value is 3s, which can be set in
the third column of Table 2
Automatic closing
delay time after voltage
returns to normal (tvd)
The default value is 10s, which can be set
14
Under voltage
protection
(can be opened and
closed)
Under voltage action
setting value (Uvu)
The default value is AC165V ±5V, which
can be set
Undervoltage recovery
value (Uvur)
The default value is AC190V, which can be
set
Minimum under
voltage non driving
time
The default value is 3s, which can be set
Automatic closing
delay time after voltage
returns to normal (tvd)
The default value is 10s, which can be set
15
Electrical parameter
Accuracy
Voltage Grade 0.5
electric current Grade 0.5
power Level 1.0

Note: "Can be opened or closed" means that the function can be set to be opened or closed.
Table 2 Maximum Action Time and Minimum Non Drive Time of Overvoltage
1 2 3 4
Overvoltage action
characteristics ≤Uvor Uvo ≥300V
Maximum action time
Inaction
5s 3s
Minimum non driving time 3s 1s
3.2 Basic error of voltage and current measurement
Table 3 Basic error limits of current under reference voltage
Direct input current value
Percentage error limit
Grade 0.5 Level 1.0
1A≤I＜0.1In ±1.0% ±1.5%
0.1In≤I≤In ±0.5% ±1.0%
Table 4 Basic Error Limits of Voltage
Direct input voltage value
Percentage error limit
Grade 0.5 Level 1.0
0.9Ue
≤
U
≤
1.1Ue
±
0.5%
±
1.0%
4 Communication function
4.1 Communication interface
The circuit breaker has one RS485 communication interface and Bluetooth interface.
RS485 interface:
-Support baud rate 1200 ,2400,4800, 9600,19200,115200;
-Verification method: no verification/even verification;
-Default configuration: 19200, even parity check.

Bluetooth interface:
-Comply with BLE4.2 standard;
-As a Bluetooth slave, the circuit breaker supports the connection of up to two Bluetooth hosts at the same
time.
4.2 communication protocol
The circuit breaker adopts Modbus RTU communication protocol. The default communication address of
the circuit breaker is 03, which conforms to the national standard GB/T 19582.
5 Remote control function
When the mode selection switch is set to the "Manual" position, normal manual closing and opening can
be performed, and at the same time, the remote closing and opening control functions exit.
When the mode selection switch is set to the "Automatic" position, normal remote closing and opening can
be performed. When the circuit breaker is in the closing state, it shall be opened after receiving the remote
opening command, and the moving contact is in the open position. At this time, it can be closed and opened
manually. When the circuit breaker is in the opening state, the circuit breaker shall be closed after receiving the
remote closing command. At this time, it can be opened and closed manually.
Regardless of whether the mode selection switch is set to the "Manual" or "Automatic" position, when the
circuit breaker receives the command of remote closing not allowed, the circuit breaker will be in the opening
and not allowing closing state, and at this time, manual or remote control cannot be closed. Only when the
circuit breaker receives the command of remote closing allowed, the circuit breaker will be in the opening and
allowing closing state, and at this time, manual or remote control can be closed.
See Table 5 for the control signal and action status of the circuit breaker.
Table 5 Control Signal and Status Control Table of Circuit Breaker
S/N
Mode
selection
switch
position
Phase line
voltage
control
signal Initial state Status after action remarks
1 automatic Ue
Send
closing
command
Opening and
allowing closing Closing

2 automatic Ue nothing Closing Opening and allowing
closing
Manual
opening
3 automatic Ue nothing Opening and
allowing closing
Closing Manual
closing
4 automatic Ue
Send the
opening
command
Closing Opening and allowing
closing
5 Automatic
or manual Ue
Send the
command of
not allowing
closing
Opening and
allowing closing
Opening and not
allowing closing
Closing Opening and not
allowing closing
6 Automatic
or manual Ue nothing Opening and not
allowing closing
Opening and not
allowing closing
Unable to
close
manually
7 automatic Ue
Send
closing
command
Opening and not
allowing closing
Opening and not
allowing closing
Remote
control fails
to close
8 Automatic
or manual Ue
Send the
command of
allowing
closing
Opening and not
allowing closing
Opening and allowing
closing
9 automatic Ue→0V nothing
Opening and
allowing closing
Opening and allowing
closing
The line is
powered
down and
remains in
the original
state
Opening and not
allowing closing
Opening and not
allowing closing
Closing Closing
10 Automatic
or manual Ue nothing Closing Opening and allowing
closing
In case of
overload,
short circuit
and other
faults, the

circuit
breaker acts
to open
11 Automatic
or manual
Ue→≥
Uvo
or
Ue→≤
Uvu
nothing Closing Opening and allowing
closing
In case of
overvoltage/
undervoltage
fault, the
circuit
breaker acts
to open. If
the
overvoltage/
undervoltage
fault occurs
3 times
continuously
within 10
minutes, it
will enter the
opening/not
allowing
closing state
12 automatic
≥Uvo→
Uvor
Or ≤
Uvu→
Uvur
nothing Opening and
allowing closing Closing
Following
No. 11,
when the
power
supply
voltage
recovers, the
circuit
breaker
automaticall
y closes
13 Manual Ue
Send
closing
command
Opening and
allowing closing
Opening and allowing
closing
Remote
control fails
to close

14 Manual Ue
Send the
opening
command
Closing Closing
Remote
control fails
to open
15
Auto →
Manual
or
Manual
→
Automatic
Ue or 0 V nothing
Opening and
allowing closing
Opening and allowing
closing
Keep the
original state
Opening and not
allowing closing
Opening and not
allowing closing
Closing Closing
6 Indicator status
The front of the circuit breaker is equipped with indicator lights to indicate different states, as shown in
Table 6.
Table 6 Status of Mode Selection Switch Indicator
Status of circuit breaker after energization
Indicator light display
The mode selector switch is set to the "Manual" position
Always bright blue
The mode selector switch is set to the "Automatic" position
Red is always on
Overload, overvoltage and undervoltage faults
Flashing red
After tripping due to overload, overvoltage, undervoltage, phase
failure and underfrequency fault Flashing red

7 Outline and installation dimensions
■Overall dimensions (unit: mm)
Figure 1 Boundary Dimensions of Circuit Breaker
■Communication port
Figure 2 Installation Position of Communication Interface
A
B
/
/
/
Note: This product must be adapted to SMG-WR

8 Installation, commissioning and operation
8.1 Before installation and use: check whether the circuit breaker mark is consistent with the working conditions
used;Before power on, the circuit breaker shall be operated several times, and its mechanism action shall be
flexible, reliable, and free of blocking.See Figure 3 for the circuit breaker closing/opening status indication and
the "Automatic"/"Manual" position of the mode selection switch.
Figure 3 Circuit breaker closing/opening status indication, mode selection switch "Automatic" and
"Manual" positions
Note: When the product leaves the factory, it defaults to disconnected status and "automatic" mode.
8.2 Installation mode
TH35-7.5 mounting rail is used for installation, as shown in Figure 4.
Fig. 4 Installation Diagram

8.3 Disassembly Diagram
Fig. 5 Disassembly Diagram
8.4 It is applicable to copper wire connection. See Table 7 for wire selection and Figure 6 for wiring mode and
stripping length.
Table 7 Requirements for Cross sectional Area of Copper Conductor
Rated current In(A)
Cross sectional area of copper conductor (mm
2
)
6 1
10 1.5
16、20 2.5
25 4
32 6
40 10

Figure 6 Wiring Mode and Stripping Length
Note: Before power on, check whether the wiring is correct and firm, verify the flexibility of the handle action,
and detect the status indication modes of manual and automatic.
9 Maintenance
The circuit breaker shall be checked regularly during operation.
When the circuit breaker fails to trip and open (such as overload, short circuit, overvoltage, undervoltage,
phase loss, underfrequency, etc.), the fault shall be eliminated first, and then the circuit breaker shall be closed
manually to restore power supply.
10 Fault Analysis and Troubleshooting
Table 8 Example of Fault Analysis and Troubleshooting
Fault phenomenon
Cause analysis
Exclusion method
The handle cannot
be closed
Whether there is short circuit at the load end
Troubleshooting
Failure of operating mechanism
Replace product
The rated current of the circuit breaker does
not match the load current Replace product specifications

Overvoltage/undervoltage in the line
Observe whether the indicator light
flashes red and automatically
switches on after voltage recovery
When over/under voltage faults occur for more
than 3 times in a row within 10 minutes
Unlock after confirming the line
status
When the remote command of closing is not
allowed
Unlock
after confirming the line
status
Remote closing is
not possible
Communication line is not connected
Correct wiring
The product is in manual mode Turn the mode selector switch to the
"Automatic" position
Overvoltage and undervoltage exist in the line Confirm line status
High temperature
The wiring screw does not compress the wire
or is loose
Tighten the wiring screws
The sectional area of selected conductor is too
small Replace wire specification
Fail to open in case
of short circuit
The selected circuit breaker does not match the
working conditions of the load
Replace product specifications
No power
Wire stripping is too short Re stripping
The wiring screw does not compress the wire
or is loose Tighten the wiring screws
11 Warranty period, environmental protection and other legal provisions
11.1 Warranty period
Under the normal storage and transportation conditions, and the product package or product itself is in
good condition, the warranty period of the product is 36 months from the date of production.
The following conditions are not covered by the warranty:
1) Damage caused by improper use, storage and maintenance of users;

2) Damage caused by organizations or personnel not designated by the company, or self disassembly and
maintenance;
3) The product exceeds the warranty period;
4) Damage caused by force majeure
11.2 Environmental protection
To protect the environment, when this product or its components are scrapped, please properly treat them
as industrial wastes; Or it can be delivered to the recycling station for classified disassembly, recycling and
reuse according to relevant national regulations.

附件： 关于使用说明书排印制方面的说明
附件1 封面：（封面印刷内容要求见下表）
序号 印刷项目 印刷内容 译文 要求说明
1 商标 CHINT CHINT 品牌管理部提供封面形象，包括
如下内容设定在封面的排列位
置的版式
2 正泰文化元素 “闪电符号” /
3 版本号 NO:2023.04 NO:2023.04 按产品使用说明书技术文件修
订年月确定
4 产品二维码 / / 空留位置，将来的产品实际维护
情况标识
5
产品型号系列 NB2-40ZT NB2-40ZT 产品单位填写使用说明书实际
所涵盖产品系列型号、名称。本
行只印刷型号
产品名称 剩余电流动作断路器
Residual
Current Operated
Circuit Breaker
6 符合标准号 IEC/EN 60898-1 IEC/EN 60898-1 产品实际所符合的国际标准
7 封面标题 使用说明书 User Instruction
集成系统业务部组织按技术文
件代号所标外国语种翻译在本
栏目中
附件2 合格证：（合格证作为产品经检验合格出厂的凭证，是必不可少的随机文件，可独立使用，也可以与使用说明
书合并使用，置于产品使用说明书的倒数第二页，关于产品合格证的印刷技术内容如下表）
序号 印刷项目 印刷内容 译文 要求说明
1 商标 CHINT CHINT 由品牌管理部统一设计
2 标题 QC PASS QC PASS 市场部与研究院确定样式并翻
译
3 产品型号系
列
NB2-40ZT NB2-40ZT 文字描述及格式固定不变，只更
新产品所符合的标准号
4 产品名称 剩余电流动作断路器
Residual Current Operated
Circuit Breaker
5 符合标准号 IEC/EN 60898-1 IEC/EN 60898-1 国际标准
6 检验工号 检12 Check 12 按产品成品实际检验员工号
7 检验日期 检验日期：请见包装
Test date: Please see The
packing 版式设计时需增加
8 公司名称
ZHEJIANG CHINT
ELECTRICS CO.,LTD.
ZHEJIANG CHINT ELECTRICS
CO.,LTD. 版式设计时需增加
附件3 封底：（关于封底的印刷技术内容要求见下表：
序号 印刷项目 印刷内容 译文 要求说明
1
商标
CHINT
CHINT
由品牌管理部统一设计

2 产品型号系
列NB2-40ZT NB2-40ZT 商标下面
3 产品名称 剩余电流动作断路器 Residual Current Operated Circuit
Breaker
4 封底标题 使用说明书 User Instruction
5
生产者（制
造商）名
称、地址
（含邮编、
邮箱、网址
等）
浙江正泰电器股份有限公
司
地址：浙江省乐清市北白
象镇正泰工业园区正泰路 1
号
邮编：325603
邮箱：
网址：
Zhejiang CHINT Electrics Co., Ltd.
Add: No.1, CHINT Road, CHINT
Industrial Zone, North Baixiang,
Yueqing, Zhejiang Province.
Tel: [phone] 4001177797
E-mail: global-
[email protected]m
Website: http://en.chint.com
统一总部海外最新信
息;由网站传媒与维护
权威部门提供
6 企业二维码
/
统一总部海外最新网站
二维码;由网站传媒与
维护权威部门提供
7
回收标志或
禁止随意废
弃标志
/
附件4 说明书的幅面尺寸、印刷色彩、装订形式、制作材质的要求（无需翻译）
序号 项目 （填写项）要求 要求说明
1 幅面尺寸 正128开（65×92）
分为正16开（185×260）、 正 32开（130×185）、 正 64开（92×130）、
正128开（65×92）等四种可选
2 印刷色彩 全彩印 封面（含封底、合格证）彩色里黑白、全单色（品蓝）、全彩印等三
种可选
3 装订形式 单张折叠本 分为单张折叠本、订装本、胶装本、线装本等四种可选；优先选用折
叠式
4 制作材质 60g/m2双胶纸
分为折叠式：128 开-60 g/m2双胶纸，64 开以上 70g/m2双胶纸；
彩印钉装式：64 开和 32 开-封面 80g/m2亚光铜版纸，里页 60g/m2双
胶纸；16 开-封面 128g/m2亚光铜版纸，里页 70g/m2双胶纸；
品蓝单色钉装式：70g/m2双胶纸