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Air Circuit Breaker Draw-out Type Fixed Type 400VAC/690VAC 630A-6300A ACB

The Air Circuit Breaker (ACB) is a vital component in modern electrical systems, designed to provide reliable protection and efficient management of electrical circuits. Engineered for safety and durability, ACBs are essential in safeguarding electrical infrastructure in industrial, commercial, and residential settings.
  • ZYMW1-2000/ZYMW1-3200

  • Yumonn


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Purpose and Scope of Use

W1 Series Intelligent Low Voltage Air Circuit Breakers (hereinafter referred to as circuit breakers) are suitable for

It is suitable for frequency of AC 50Hz, rated voltage up to 660V (690V) and below, and rated current from 200A to 6300A.It is used to distribute electric energy and protect lines and electric equipment from overload, undervoltage, short circuit, single-phase grounding and short circuit, short circuit, single-phase grounding and other faults. With intelligent protection functions and precise selective protection, the circuit breaker can improve the reliability of 

power supply and avoid unnecessary power outages. At the same time, it has an open type communication interface for four-remote operation to meet the requirements of the control centre and and automation system. The impulse withstand voltage of the circuit breaker is 8000V at 2000 metres above sea level (according to the standard correction for different altitudes, the impulse withstand voltage is 8000V at 2000 metres above sea level,and the maximum voltage does not exceed 12000V).The circuit breaker complies with GB 14048.2‘Lowvoltage switchgear and controlgear Part 2: Circuit breakers’ and IEC60947 ‘Low-voltage switchgear and controlgear Part 3: Circuit breakers’ and other standards.

Normal working a nd installationconditionAmbient air humidity

The upper limit value shall not exceed +40C, the lower limit value shall not be less than -5℃, andthe24-hour average value shall not exceed +35℃:Note: For working condition with lower limit of -10℃ or-25℃ or -40℃, theuser should declare to our factory;Forworking condition where the upper limitvalue exceeds +40C or the lowerlimit value is below -10C or -25C, the user should consult with our factory.Thealtitude of the installation site shall not exceed 2000mAtmospheric condition

The relative humidity of theatmosphere does not exceed 50% when the ambient air temperature is +40℃. At lower temperature, therecan be higher relative humidity. The average maximum relative humidity in the wettest month is 90%, and the average minimum temperature in that month is +25℃, and the condensation on the product surface due to temperature change should be considered.The user should consult with our factory for condition beyond the regulation.

Protection level: IP30

Utilization category: Category A or B

Installation category

For the circuit breaker and undervoltage release with rated working voltage of 660V (690V) and below, the installation category of primary coil of power transformer is IV; and the installation category of auxiliary and control circuit is III.

Installation condition

The circuit breaker should be installed according to the requirement of this manual, and the vertical inclination of the circuit breaker should not exceed 5° (the inclination of mining circuit breaker should not exceed 15°).

Applications for Air Circuit Breakers

Air circuit breakers are versatile and rugged, so they can be used in a wide range of industries. Some common applications include:

1. Industrial installations: In industrial environments, 400V air circuit breakers are used to protect critical machinery, motors and other electrical equipment from overloads and short circuits. These circuit breakers are critical to maintaining the operational integrity of industrial processes and ensuring the safety of personnel. 2.

2. Commercial Buildings: From office buildings to retail shops, 400V air circuit breakers are used to protect electrical distribution systems in commercial buildings. They play an important role in protecting lighting, HVAC systems and other electrical loads, helping to improve the overall safety and reliability of a building's electrical infrastructure.

Technical Data and Performance

1.The rated current of the circuit breaker is shown in Table 1

Rated frame current Inm A Rated frame current Inm A
2000 400、630、800、1000、1250、1600、2000
3200 400、630、800、1000、1250、1600、2000
4000 3200. 3600, 4000
6300 4000. 5000, 6300

2. The rated short-circuit breaking capacity and short-term withstand current of the circuit breaker are shown

in Table 2, and the arc distance of the circuit breaker is "zero" (i.e. there is no arc outside the circuit breaker)

Rated frame current Inm A
2000 3200 4000 6300

Rated ultimate short-circuit

breaking capacity


400V 80 100 100
690V 50 65 65 85

Rated short-time making capacity


400V 176/0.2 220/0.2 220/0.2
690V 105/0.25 143/0.2
143/0.2 187/0.2
Rated service short-circuit

breaking capacity


400V 65 85 80
690V 50 50 65 75

Rated short-time withstand

current Icw

(KA) 1s, delay 0.4s, O-CO

400V 50 65 65/80(MCR) 85/100(MCR)
690V 40 50 65/80(MCR) 65/75(MCR)

Note: The breaking capacity in the table is the same for the upper and lower incoming lines.

3. The maximum power consumption of the circuit breaker is 360W. The variation of the rated continuous

current of the circuit breaker under different ambient temperatures is shown in Table 3


temp. C/W1

630A 800A 1000A 1250A 1600A 2000A
630A 800A 1000A 1250A 1600A 2000A
50 400A 630A 800A 1000A 1250A 1550A 1900A
60 400A 630A 800A 1000A 1250A 1550A 1800A

4. Intelligent overcurrent controller protection characteristic and function

4.1 Overcurrent controller protection characteristic

4.1.1 The setting value Ir (I/In) and error of the controller are shown in Table 4

Long delay
Short delay
Instantaneous Ground fault
Ir1 Ir2
Error Ir3 Error Ir4
(0.4-1) In (0.4-15) In ±10%







Max 1200A

Min 160A




Note: When simultaneously having three-section protection(required), the setting value cannot cross.

4.1.2 For long delay overcurrent protection inverse time limit action characteristic 12TL=(1.5lrl)2tL, the action time of(1.05-2.0)Ir1 is shown in Table 5, with time error of ± 15%.

Note: tL-Setting time for long delay of 1.51r1, TL -Action time for long delay

1.3lr1 1.5lr1 setting time s 15 30 60 120 240 480
>2h non action >2h non action 2.0lr1 f action time s


135 270

4.1.3 Short delay overcurrent protection characteristic

The short delay overcurrent protection is of definite time limit. If the low multiple is required to be the inverse time limit, its characteristic is as follows: 12Ts=(8lr1)2ts, ts is the generally designed delay time; when the overload current is greater than 8lr1, it automatically switches to definite time limit characteristic, which is shown in Table 6. The time limit error is ±15%.

Delay times Returnable times
0.1 0.2 0.3 0.4 0.06
0.14 0.23 0.35

4.1.4 The overcurrent tripping protection characteristic is shown in Figure 1, and the ground fault protection characteristic is shown in Figure 2

4.2 M type intelligent controller function

a. Ammeter function

It displays the operating current and ground leakage current of each phase, normally displays the maximum phase current, and also displays the current or time value of setting, testing and fault.

b. Voltmeter function

It displays the voltage of each line, and normally displays the maximum value.

c. Remote monitoring and self-diagnosis function

1 The controller has local fault self-diagnosis function

When the computer malfunctions, error "E" display or alarm can be sent, and the computer can be restarted. If the user needs it, the circuit breaker can also be opened.

2 When the local ambient temperature reaches 80C, alarm can be sent and the circuit breaker can be opened at low current (when required by the user).

3 The intelligent controller has overload, grounding, short circuit, load monitoring, pre-alarm, and trip indication (OCR) signals output through contact or optocoupler, making it easy for users to use for external remote control. The contact capacity is DC28V, 3A; AC125V, 3A.

d. Setting function

Various parameters of the controller can be adjusted with the four buttons:Set,, and Store. Press the Set to the desired state (indicated by the status indicator light), then press the orEto adjust the parameter to the desired value, and then press the Store button again. The store light illuminates once to indicate that the setting value has been locked. The protection parameter of the controller shall not be set across. After the controller is powered off and reset, press the Set button again to check the various parameters set circularly.

e. Test function

By using buttons such as Set, Trip, Non-trip and Reset, various protection characteristics of the controller can be checked. Use the Set.E and buttons to adjust simulated fault test current (note: do not store and lock), and then press the Tripor Non-trip button to test. The controller can enter fault handling. When pressing the Trip button, the circuit breaker breaks, when pressing the Non-trip button, the circuit breaker doesn't break, and the controller's various indicating states are normal. After the test, you need to press the Reset or Clear light button once

before proceeding with other tests.

Note: For the convenience of the test, regardless of whether the grounding leakage is set at the tripping or alarm position, the test will be treated as tripping, and the priority is lower than overload protection. Once malfunction occurs during the test, the controller automatically stops all tests and enters fault handling.

f. Load monitoring function

Set two setting values: ILC1 setting range (0.2-1) In and ILc2

and its time setting value is 1/2 of the long delay setting value; there are two types of ILc2 delay characteristics. The first is the inverse time limit characteristic, with time setting value of 1/4 of the long delay setting value. The second is the fixed time limit characteristic, with delay time of 60 seconds. For these two delay functions, the former is used to cut off the unimportant load when the current approaches the overload setting value, while the latter is used when the current exceeds the setting value of ILc1, causing a delay of cutting off the unimportant load at the lower level, causing the current to decrease and maintain power supply for the main circuit and important load circuit. When the current drops to ILc2, after a certain delay, a command is sent to reconnect the cut off circuit at the lower level, restoring power supply of the entire system. The user can choose either of the two types of monitoring protection mentioned above, and the monitoring characteristic is shown in Figure 3 and Figure 4.

g. MCR tripping and simulated tripping protection can be turned off according to user requirement, and generally need to be turned off when conducting short delay breaking test

1 MCR on/off protection is mainly used when the line is in fault state (when the controller is powered on), and the controller has the function of breaking the circuit breaker at low short-circuit current. The factory setting is 10kA with error of ±20%, and the set current can be determined according to the protection requirement.

2 The controller has the function of directly sending trip signal without processing the signal by the host chip when there is an extremely large short-circuit current.

h. Thermal memory function

After the controller is overloaded or has a short circuit delay trip, it has memory function that simulates the characteristic of bimetallic sheets before the controller is powered off. The overload energy is released after 30 minutes, and the short delay energy is released after 15 minutes. During this period, if overload and short delay faults occur, the tripping time will become shorter, the controller will power off, and the energy will automatically reset.


4.3 H type intelligent controller

In addition to having all the functions of the M type, it also has serial communication interface. Through the communication interface, a local area network system (hereinafter referred to as the system) with a master-slave structure can be formed, with 1-2 computers as the master station. If the intelligent circuit breaker or other communicable components are used as the slave station, the system network structure is shown in the following figure. For circuit breaker unit, the system can achieve long-distance "four remote" functions for monitoring of various power grid parameters and operating parameters, monitoring of the current operating status of intelligent circuit breaker, adjustment and download of various protection limit parameters and control of opening and closing operations of intelligent circuit breaker. The system is suitable for the construction and renovation of power distribution monitoring system in various power stations, power plants, small and medium-sized substations, industrial and mining enterprises, buildings, etc.

The connection diagram of the dedicated communication protocol interface is as follows:


4.3.1 System composition

(a) Hardware structure of data communication network system

A The intelligent circuit breaker provides standard RS485 communication interface, which is led out from the No. 10 and 11 outgoing lines of the circuit breaker;

A The communication medium connected to the system: Class A shielded twisted pair.

(b) Main characteristic of the network

A Bidirectional serial data transmission method, the product can provide multiple communication protocol modes: "Data Communication and Its Criteria for Low Voltage Apparatus V1.0", PROFIBUS-DP, MODEBUS, etc.

4 Strict master-slave mode, that means the master station is the initiator and controller of communication, and the slave station can only communicate with the master station and cannot directly communicate with other slave stations.

A The communication baud rate is 9600bit/s, and the communication distance is 1.2km. For typical applications of PROFIBUS-DP communi cation baud rate, it can reach 187.5kbit/s.

(3) Monitoring software

YSS2000 configuration software can achieve the required configuration application of monitoring and management software according to different project requirements. For intelligent circuit breaker, it can achieve operation monitoring and various daily management functions.

4.3.2 System function

(a) Remote control

Remote control refers to the operation and control of energy storage, closing and opening of circuit breaker of each slave station in the system through the master station computer. The operator selects the corresponding object from the system interface, clicks the remote control button with the mouse, and the system provides the current operating status of the corresponding object. After the operator inputs the operation password, they can send remote control command for "closing" or "opening". The system passes the command to the corresponding circuit breaker slave station. After receiving the commands, the slave station performs operations such as breaking, closing and energy storage according to the established sequence, and reports the remote control result to the master station.

(b) Remote adjustment

Remote adjustment refers to setting the protection setting value of the slave station through the master station computer. In the master station computer, there are protection setting tables for all slave stations. The operator selects the corresponding object from the system interface, clicks the remote adjustment button with the mouse, and the system provides the current settings of all protection setting values for the corresponding object, as well as the protection setting table for that object. After the operator inputs the operation password, they can select

the required parameter from the parameter table, and then click the corresponding button. The master station downloads the parameter to the corresponding slave station, and report the result of remote debugging. After receiving command, the slave station modifies its own protection setting value.

c Remote measurement

Remote measurement refers to the real-time monitoring of the power grid operating parameter of each slave station through the master station computer. The communication sub-station reports the working parameter to the upper computer as follows: real-time A, B, C, N phase current value of each sub-station, voltage value of UAB, UBC, UCA, etc. 

A The fault record can record the following fault parameters 

The current value of A, B, C, and N phases during the fault, the voltage value of UAB, UBC and UCA, the fault type, and the fault action time, and it can also record the fault in the fault database.

A The computer displays the current real-time current and voltage of each sub-station through bar chart, absolute value table and other methods, and displays the operating status of each node through real-time curves.

(d) Remote communication

Remote communication refers to viewing the model, closing and opening status, various protection setting values, as well as the operation and fault information status of the slave station through the master station computer. The parameters reported from the slave station circuit breaker to the upper computer mainly include: switch model, switch status (on/off), fault information, alarm information, various protection setting values, etc.

(e) Other system functions

In addition to the four remote operation control function, the system can also perform various management functions: accident alarm (information screen, screen pushing, event printing, accident dialing, sound alarm), event recording, maintenance listing, shift handover management, load trend analysis and various reports printing.

4.3.3 L type intelligent controller

The L type controller adopts code switch and toggle switch setting methods, and has overload long delay, short circuit short delay, instantaneo us and ground leakage four-section protection characteristics. It also has functions such as fault status and load current light column indication, but there is no digital display, and its functions are not as complete as the M and H types. The user can choose it for general situations.

4.4 Operating performance of circuit breaker

The operating performance of the circuit breaker is represented by the number of operation cycles, as shown in Table 7

Rated frame current (A)
Total number of operation cycles


3200. 4000 5000
6300 2000

4.5 The working voltage and required power of the shunt release, undervoltage release, motor operating mechanism, energy release

(closing) electromagnet and intelligent controller of the circuit breaker are shown in Table 8

Note: The reliable operating voltage range of the shunt release is 70%~110%, and that of the closing electromagnet and operating mechanism are 85%~110%

4.6 The performance of the undervoltage release of the circuit breaker is shown in Table 9

Category Undervoltage delay release Undervoltage instantaneous release
Undervoltage instantaneous release 1,3,5s delay Instantaneous

Release action

voltage value

35%~70%Ue The circuit breaker can reliably open
≤35%Ue The circuit breaker cannot close
(85~110%) Ue The circuit breaker can reliably close
If the supply voltage recovers to 85% Ue within 1/2 delay time
The circuit breaker doesn't open

Note: The accuracy of the delay time is ±10%

4.7 Performance of auxiliary contact

4.7.1 The conventional thermal current of the auxiliary contact is 6A

4.7.2 Auxiliary contact form: 4NO, 4NC.

4.7.3 Abnormal making and breaking capacity of auxiliary contact

The making and breaking capacity determined by the use of auxiliary contact under abnormal usage conditions is

shown in Table 10





Number of making/breaking operation

cycles and operation frequency

I/le U/ Ue


or T0.95

I/le I/le


or T0.95

Number of



Number of

operation cycles

per minute


on time (s)
















6 (or the same

operating frequen

cy as the main



Note: When Pe≥50W, the upper limit of T0.95=6Pe≤300ms

4.7.4 The making and breaking capacity of auxiliary contact under normal condition is shown in Table 11





I/le U/ Ue


or T0.95

U/ Ue


or T0.95

AC-15 DC-13 1 0.3 1 1 0.3
DC-13 1 1 6Pe 1 1 6Pe

4.8 Key lock in open position

The circuit breaker is equipped with an "open position key lock" accessory (supplied according to order requirement), which can lock the circuit breaker in the open position. At the moment, neither the closing button nor the release (closing) electromagnet can close the circuit breaker.

Structure overview

The fixed type circuit breaker mainly consists of contact system, intelligent controller, manual operating mechanism, electric operating mechanism and mounting plate; The draw-out type circuit breaker mainly consists of contact system, intelligent controller, manual operating mechanism, electric operating mechanism and draw-out seat. The circuit breaker is arranged in a three-dimensional form, with the characteristics of compact structure and small volume. The contact system is enclosed in insulated base plate, and the contact of each phase is also separated by insulated plate, forming small compartments.

The intelligent controller, manual operating mechanism and electric operating mechanism are arranged in front of each other to form independent units. If one of the units is damaged, the entire unit can be removed and replaced with a new one. The draw-out type circuit breaker consists of plug-in circuit breaker and a draw-out seat. The guide rail inside the draw-out seat can be pulled in and out, and the inserted circuit breaker is located on the guide rail to get in and out of the draw-out unit. The main circuit is connected through the insertion connection between the busbar on the inserted circuit breaker and the bridge contact on the draw-out seat.

The draw-out type circuit breaker has three working positions: "connection" position, "test" position, and "disconnection" position. The position change is achieved by turning the handle in or out. The indication of the three positions is displayed by the pointer on the draw-out seat crossbeam.

When in the "connection" position, both the main circuit and the secondary circuit are connected; when in the "test" position, the main circuit is disconnected and separated by insulation partition, and only the secondary circuit is connected for some necessary action tests; when in the "disconnection" position, both the main circuit and the secondary circuit are disconnected. The draw-out type circuit breaker has mechanical interlocking device, the circuit breaker can only be closed in the connection position or test position, and cannot be closed in the middle position between connection and test.

1. Interlocking mechanism of circuit breaker (suitable for draw-out type and fixed type). The user can use interlocking mechanism to switch two or three sets.

1.1 Lever interlocking


1.2 Soft interlocking (both horizontal and vertical can be equipped)


Internal connection

  1. Ground fault protection circuit


2. External single-phase ground protection function

External current transformer (neutral pole current transformer or ground current transformer) is provided as an accessory to user. The user shall insert it into the busbar and connect the wiring (with a length of 2m) to the secondary wiring terminals # 25 and # 26 of the circuit breaker. 

The center cut-out dimension of the external current transformer (maximum allowable size of the perforated busbar) is as follows:

Width Height


W1-4000/ 4


W1-3200 and above

(except for W1-4000/4

87 31

Outline and installation dimension

ACB Size 1ACB Size 2ACB Size 3ACB Size 4ACB Size 5ACB Size 6Size 7Size 8Size 9

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