ACDC M3EL Series Residual Current Protection Circuit Breaker

Scope of application

The rated insulation voltage of the M3EL series of residual current action circuit breaker is 800V, which is suitable for those three-phase four-wire neutral-point direct ground (TT) distribution network of AC 50Hz, rated voltage 400V, and rated current of up to 630A. They are used to provide indirect contact protection; to prevent the damage to insulation of the equipment, which will produce the fire hazards caused by the grounding fault current; also, they can be used to distribute power, protect circuits and power equipment from overload, undervoltage, short circuit, single-phase grounding and other malfunctions.

• The products shall meet the following standards:
• GB 14048. 1-2012 “Low-voltage switchgear and controlgear – Part 1: General Provisions”;
• GB 14048. 2-2008 “Low-voltage switchgear and controlgear – Part 2: circuit breaker”;
• GB17701-2008 “Circuit Breaker for
• Equipment”;
• GB/Z22202-2008: Reliability Test Method for Residual Current Action Circuit Breaker for

Household and Similar Applications;
JB/T 10494-2005 Reliability Test Method for Residual Current Action Circuit Breaker for
Household and Similar Applications
JB/T 8979-2006 “Residual Current Action Circuit Breaker With or Without Overload Protection”

Main functions and characteristics:

• A high-performance 32-bit ARM microprocessor is adopted to carry out signal processing and intelligent control in real time;
• LCD display in Chinese, with friendly human-machine interface, easy for operation;
• Residual current (leakage) protection, with residual current shift being fixable online, with the function of reclosing;
• Monitor and track the circuit’s residual current in real time, and automatically adjust the shift position, to ensure delivery rate and reliability of products;
• Three-stage protection (long delay, short delay and instantaneous), with electronic tripping, independent of the power supply voltage;
• With high breaking capacity, ensure the reliability of short-circuit protection of the line;
• Over-voltage protection, under-voltage protection, phase loss protection;
• Real-time display of residual current, three-phase power supply voltage and load current of the line;
• Protection functions and parameters can be set and modified online;
• Identification and display of tripping type (residual current, blocking, overload, undervoltage, overvoltage, phase loss), which can be stored, queried and deleted.
• With communication function, remote signaling, telemetry, remote control, remote adjustment can be realized.
• With infrared communication function, it can be also equipped with the outer hanging lightning protection module.

Product model and its meaning

Use environment

• The installation site should be free of conductive dust, corrosive gases, flammable and explosive gases, rain or snow erosion
• Altitude ≯2,000m;
• Ambient temperature -5℃~ +40℃, the average daily maximum temperature ≤ +35 ℃;
• Relative humidity ≤ 50% (when ambient temperature is +40 ℃);
• The strength of external magnetic field in the installation place should not exceed 5 times of that of the geomagnetic field in any direction.
• The installation location shall be well ventilated and heat dissipated.

Main technical parameters

Description of protection characteristics

Overload long delay protection

Action value setting range
Table 1: Overload long delay parameter setting

Action characteristics
Table 2: Protection action characteristics

Time delay characteristics
The overload protection is carried out according to the anti-timing characteristics:
T= ( 6Irl/I ) 2tL Delay accuracy: ± 10%
Among them, T is the action time value, Irl is the long delay protection setting value, I is the fault current, and tL is the long delay time setting value

short-circuit short delay protection
Short-circuit short time delay protection prevents the impedance short circuit of the power distribution system. The delay of trip is to realize the selective protection.

Setting of short-circuit short delay protection parameters
Table 3: Setting of short-circuit short delay parameters

Short-circuit short delay protection action characteristics

Table 4: Short-circuit short delay action characteristics

Instantaneous protection
Setting of short-circuit instantaneous protection parameters

Table 5: Instantaneous parameter settings

Short-circuit instantaneous protection action characteristics
Table 6: Instantaneous action characteristics

Residual current protection characteristics
Shift setting range

Action characteristics

Automatic shift mode
In the automatic shift mode, the shift values and the floating values are:

When the residual current exceeds the floating value of the shift and fails to achieve its action value, and maintains stable for 60s, it will float up by one shift, and so on, until the maximum shift; When the residual current is less than the floating value of the next shift and remains stable for 120s, it will float down by one shift, and so on, until the minimum shift. Take the “automatic” shift, with the initial residual current of the line being 100mA, as example. The circuit breaker is energized and the shift setting is automatically fixed at 300mA. After the residual current increases to 150mA and above, and keep stable for 60s, the shift changes to 400mA; When the residual current decreases to 100mA and below, and keep stable for 120s, the shift changes to 200mA.

Automatic reclosing/locking
Automatic reclosing: After the residual current exceeds the action current value shift and gets tripped, it will be able to reconnect automatically after 20~60 seconds, but the manual closing is not time-limited.
Locking: The locking time is 5s, that is, when there is another leakage fault within 5s after the product reclosing, the circuit breaker can trip again and lock in the time of action, and it is necessary to manually close instead of automatically reclosing; When the product has a leakage failure outside 5s after the re-closing, the circuit breaker is tripped but not locked during the action time, and it can be automatically reclosed within 20~ 60 seconds.

Over-voltage protection function
When the line phase voltage is higher than the over-voltage protection setting value, the circuit breaker performs protective tripping. When the line voltage is restored to normal voltage, the circuit breaker can be automatically closed and put into operation. The setting value of over-voltage protection is 250V ~ 300V, and the factory value is set to 265V. Users can set or close the protection by themselves.

Under-voltage protection function
When the line phase voltage is lower than the under-voltage protection setting value, the circuit breaker performs protective tripping. When the line voltage is restored to normal voltage, the circuit breaker can be automatically closed and put into operation. The setting value of the under-voltage protection is 150V~200V, the factory setting value is 165V. Users can set or close the protection by themselves.

Phase loss protection function
When there is a phase loss on the line power supply terminal, the circuit breaker performs protective tripping. When the line is restored to normal voltage, it can be automatically closed and put into operation. The factory default setting is closing.

Linkage protection function
Through the linkage interface, it can be linked with other fire protection equipment for linkage protection, specifically as follows:

Note: In case of short connection for a long period of time, the short-circuit is always in the opening state.

Overcurrent short-circuit protection characteristic curve

Communication function

Product installation

Product installation notes

• Please check whether the product specifications are correct and the accessories are complete before installation;
• Please read the instructions for use carefully, to ensure proper installation and daily maintenance;
• Products must be installed vertically;
• According to the product rated current and relevant criteria, select the appropriate wire and connect in strict accordance with the provisions of wiring.

The upper part is the power supply terminal, in which 1, 3 and 5 are respectively connected with phases A, B, C, and N is connected with zero line. The lower part is the load terminal, in which 2, 4 and 6 are respectively connected with phases A, B, C, and N is connected with zero line;

• The cross-sectional area of incoming and outgoing lines shall meet the construction requirements as specified in the standard, and the conductive part shall not be exposed beyond the shell;
• Install the arc plate correctly after wiring is completed;
• Install in places where non-electrician and minors are not accessible, to prevent electric shock or changes to the correct configuration and wiring of the product;

Operation of LCD products
The circuit breaker is equipped with a test power-up function upon power-on (which can be turned off), which can effectively guarantee safety of the follow-up equipment.

Product commissioning
After the wiring is complete and correct through check, energize the circuit breaker. When the circuit breaker is in a disconnected state, set the parameters according to the operation instructions. After the setting is complete, perform the closing operation. The running states are shown in Fig. 2, Fig. 3 and Fig. 4.
In the closing condition, press [test trip] key to carry on the residual current test trip, and perform reclosing within 20S-60S.

Closing operation of the circuit breaker

1. Automatic closing
   Press [closing] key for 2 seconds, and LCD will display “during closing..”. After the closing, the state of the LCD screen appears as “closing operation”, and the circuit breaker enters the normal operation state.
2. Manual closing
3. Use the attached manual wrench, insert it into the hole, and rotate clockwise by around 360°. After the success of closing, the state of the LCD screen is automatically updated as “closing operation”, and the circuit breaker enters the normal operation state.
   Note: Manual switching can be performed when the circuit breaker’s main contact is disconnected. The closing operation is shown in the above Method 2. Pay attention to the safety of load equipment and personnel during manual closing.

Disconnection operation of circuit breakers

1. In the running state, press the [opening] key. After the successful opening, the state of the LCD screen is shown as “opening standby”.
2. If manual opening is needed, use wrench, insert it into the hole, and rotate clockwise by around 180°. After the successful opening, the state opening/closing is shown as “opening”.

Operation instructions of LCD products

Main menu 

• In the real-time display status
• Press [Setting] button to enter the main menu interface as shown above.
• Press [Up/Down] button to control the highlighted display position.
• Press [OK] button to enter the corresponding sub-menus.

Setup menu

As shown above.

• [Up/Down] button to control the highlighted display position or page flip.
• [OK] button to enter the corresponding setting menu.
• [Return] button to return to the previous menu.

Overvoltage setting

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Overvoltage protection can be turned OFF or set as 250V to 300V.

Undervoltage setting

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Undervoltage protection can be turned OFF or set as 150V to 200V.

Default phase setting

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Phase default protection can be turned OFF or set as 10V to 50V.

Overload setting

As shown above

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Delay time is OFF / (or) overcurrent protection function is disabled when it is OFF See the curve chart for the overload delay time curve.

Short-circuit setting

As shown above

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Delay time is OFF / (or) overcurrent protection function is disabled when it is OFF Ir3: short-circuit instantaneous current
  Ir2: short-circuit short-time delay current
  Note: the Ir2 setting value cannot exceed the Ir3 setting value

Characteristics setting

As shown above

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Delay time is OFF / (or) overcurrent protection function is disabled when it is OFF Common alarm: short-circuit instantaneous current
Reclosing enablement: it will not automatically reclose after closing
Gear return: the residual current will not automatically float in auto mode after shutdown Overcurrent protection: all current-related faults will not be protected after shutdown Overcurrent alarm: all current-related faults will not be signaled after shutdown
Sound and light alarm: all alarms will not be output after shutdown

Residual current setting

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Residual record setting

As shown above.

• [Up/Down]button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Time setting

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Communication setting

As shown above

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Display setting

As shown above.
[Up/Down] button to control the highlighted display position or adjust parameters.
[OK] button to enter the corresponding setting menu/switch setting options.
[Return] button to return to the previous menu.

Password setting

As shown above

• [Up/Down] button to control the highlighted display position or page flip.
• [OK] button to enter the corresponding setting menu.
• [Return] button to return to the previous menu.
  • Level 0 password default value: 0000
  • Level 1 password default value: 0000
  • Level 2 password default value: 0000

Other settings

As shown above

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
• Switch-on trial power: ON– if the circuit is energized and is faultless, the product will automatically close;
• Power-off release: ON– the product automatically trips when the circuit is de-energized

Trial trip setting

As shown above.
[Up/Down] button to control the highlighted display position or adjust parameters.
[OK] button to enter the corresponding setting menu/switch setting options.
[Return] button to return to the previous menu.

Restore factory setting

As shown above
[Up/Down] button to control the highlighted display position or adjust parameters.
[OK] button to enter the corresponding setting menu/switch setting options.
[Return] button to return to the previous menu.

Level 1 password is required for restoring factory setting. No records and password parameters are allowed to be cleared when factory setting is restored and the maintenance mode can not be exited

Query menu

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Cumulative record

As shown above.
[Up/Down] button to flip for checking.
[Return] button to return to the previous menu.

October 12, 2014 is the time when the system is restarted
Peak record

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

The peak record of the three-phase voltage, the three phase current and the residual current from the 1st to the 31st (maximum and minimum occurrence time) can be queried

Residual over-limit record

As shown above.

• [Up/Down] button to query the record before and after.
• [Return] button to return to the previous menu.
• 00: represents the current record location

Self-inspection record

As shown above.

• [Up/Down] button to query the record before and after.
• [Return] button to return to the previous menu.
• 01: represents the current record location

Trip record

As shown above.

• [Up/Down] button to query the record before and after.
  
• [Return] button to return to the previous menu.
• [OK] button to switch to the real-time status before fault.
• 01: represents the current record location

Residual alarm record

As shown above.

• [Up/Down] button to query the record before and after.
• [Return] button to return to the previous menu.
• 01: represents the current record location

Line-residual record

As shown above.

• [Up/Down] button to query the record before and after.
• [Return] button to return to the previous menu.
• 01: represents the current record location

System record

As shown above.

• [Up/Down] button to query the record before and after.
• [OK] button to return to the previous menu.
• [Return] button to return to the previous menu.
• ID: represents the current record location

About menu

As shown above.

• [Up/Down] button to flip up and down.
• [Return] button to return to the previous menu.

Maintenance menu

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Level 2 password is required to log in maintenance menu which will be automatically logged out when there is no keyboard operation within return time after logging in
Maintenance menu can check and operate the event record, login password and switch status, etc. Trial trip: if the switch is in close status, the trial trip function will be started to check whether release can be normally carried out

Self-inspection: the switch starts the self-inspection program to check whether there are error parameters
Mechanical test: the switch automatically conducts the on and off operation, with an interval of 10 to 999 seconds/time

Maintenance mode

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

The switch does not conduct any protection under the maintenance mode, the backlight of the screen flashes, and the power is still maintained in maintenance mode until you press the “return” or “logout return” to exit maintenance mode; after choosing “return” to exit, level 0 password is required for reentering the maintenance mode, while after choosing “logout return”, the password shall be entered for reentering.

Capacity

• [Up/Down] button to control the highlighted display position or adjust parameters. [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.

Self-inspection

Mechanical test

As shown above.

• [Up/down] button to adjust the countdown parameters.
• [Setting] button to switch setting options.
• [OK] button to check operation times.
• [Return] button to return to the previous menu.

In the mechanical test mode, press the button to exit the mechanical test mode, in which the up and down buttons are to check the number of tests, and the countdown will be automatically displayed when the buttons are not operated beyond the return time.

Password reset

As shown above.

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu. Level 0 password is required to reset the password, and when it is correct, it will automatically return to maintenance menu

Logoff return

• [Up/Down] button to control the highlighted display position or adjust parameters.
• [OK] button to enter the corresponding setting menu/switch setting options.
• [Return] button to return to the previous menu.
  Password is required for reentering after logoff return

Operation of digital tube products

The circuit breaker is provided with the switch-on trail power function (which can be turned off), which can effectively prevent the safety of the follow-up equipment. See the setting code table for specific operation.

Test run of products
After the connection is finished, the circuit breaker will be electrified after being checked to be free of errors. The circuit breaker is in segment status, and the parameters are set according to the operation instructions. After the setting is completed, the closing operation is performed. During the closing, the closing indicator light flashes, which is always on after the closing is completed.
In the closing state, press [trial trip] key for residual current trial trip, in which reclosing can be repeated within 20s to 60s.

Closing operation of circuit breaker

1. Automatic closing
   Long press the [close] key for 2 seconds. The closing indicator light flashes, which is always on after the closing, and when the closing and opening indication is “close”, the circuit breaker enters the normal operation status.
2. Manual closing
   Insert the manual wrench mentioned in the annex in the hole and turn clockwise about 360°. After the closing is successful, the closing indicator light is always on, the closing indication is “closed” and the circuit breaker enters the normal operation status.

Note: when the main contact of the circuit breaker is disconnected, the manual closing can be carried out. See mode 2 above for closing operation. Pay attention to the safety of the load equipment and personnel during manual closing.

Disconnection operation of circuit breaker

1. Under the operation state, press the [open] key. After the opening is successful, the closing indicator lights are off and the closing and opening indications are “open”.
2. If manual opening is required, insert a wrench into the hole and turn it clockwise 180 °. After the opening is successful, the opening and closing indications are “open” and the closing indicator light is off.

Operation instructions of digital tube

Menu description of digital tube
The menu is displayed in the way of [real-time display], [parameter setting], [fault display] and [fault query] with panel indicator light. The display panel is as follows:

• Indicator light description
• Set (indicator light): after entering the setting menu, this light is on automatically, otherwise it will be in off status.
• Query (indicator light): after entering the query menu, this light is on automatically, otherwise it will be in off status.
• Alarm (indicator light): when there is alarm information, this light is on automatically, otherwise it will be in off status.
• Fault (indicator light): when this product trips due to faults, this light is on automatically, otherwise it will be in off status.
• Automatic (indicator light): when the leakage is set as automatic mode, this light is on automatically, otherwise it will be in off status.
• Communication (indicator light): when communicating with the external equipment, this light is on automatically, otherwise it will be in off status.
• Close (indicator light): when this product is in automatic closing, this light flashes, and is always on after closing, otherwise it will be in off status.
• Block (indicator light): when the product is in closing status, this light is on automatically, otherwise it will be in off status.

Real-time display

• [Real-time display] is displayed in the way of switching display between the code and the real time value, and the display unit has been marked on the panel.
• Press [up]/[down] button for switching display contents.
• Press [set] button to enter [parameter setting] menu.
• Press [OK] button to enter [fault query] menu.

Parameter setting

• [Parameter setting] is displayed in the way of switching display between the set code and the set value, and the display unit has been marked on the panel.
• [Parameter setting] defaults to the query mode, and at this time, the set code is displayed with the set value.
• Press [up]/[down] button for switching display contents. When setting is required, press [OK] button to enter the setting mode, but at this time, only the set value is displayed, so press [up]/[down] button for
• parameter adjustment. Press [OK] button to save the set parameters, and return to query mode.
• The 4-digit operation password shall be entered for setting the parameters the first time, and the digital tube displays when the password is entered. At this time, press [OK] button to enter the password entering status, press [up]/[down] button for adjusting the password entering values and press [set] button to select the password. If the password is wrong, reenter.

Query mode

• Press [up]/[down] button for switching the setting options
• Press [OK] button to enter the setting mode, in which the operation password shall be entered for setting the first time, and press [return] button to return to [real-time display] menu.

Setting mode

• Press [up]/[down] button to adjust and set the parameters
• Press [OK] button to save the set parameters, exit the setting mode and return to query mode Press [set] button to operate the parameter shift.
• Press [return] button to return to [real-time display] menu.
• 12.6 Fault display
• [Fault display] is displayed in the way of fault code which has been marked on the panel.

Fault query

• [Fault query] is displayed in the way of fault code and fault index, in which the fault code has been marked on the panel.
• Press [up]/[down] button to query the fault record before and after
• Press [OK] to return to [real-time display] menu.
• Press [return] button to return to [real-time display] menu.

Appearance and installation dimensions

Appearance and installation dimension diagram

Match of cross-sectional area and the rated current of connecting wire

Cross-sectional area with rated current not greater than 400A but matched with the connecting wire

Cross-sectional area with rated current greater than 400A but matched with the connecting wire

Transportation and storage

Transportation
Prevent the invasion and mixed loading of water, rain, snow or other harmful liquids such as chemical solvents, corrosive liquids during the transportation of products; prevent the strong impact and extrusion between objects; stack according to the direction given on the packaging. See the outer box identification for the number of layers.

Storage

• Environment conditions for storage: environment temperature -10℃ – +45℃;
• Relative humidity≤90% (when the environment temperature is + 20℃);
• The storage place shall be free of dust and conductive dust;
• There shall be free of corrosive, flammable and explosive gases and free of rain and snow invasion;
• Dry and ventilated;
• Stack according to the direction given on the package and do not stack higher than that identified on the outer box.

Precautions

• After the products are normally put into operation, they shall be tested once a month and the test record shall be done.
• The Company does not assume “three guarantees” responsibility for the non-quality problems caused by improper installation and use and the burnt wiring terminals due to improper wiring
• If there is a problem in the use of the products, please contact the local dealer or the customer service center of the Company.

Customer service hotline
Please keep this instruction properly.

CERTIFICATE OF CONFORMITY

• Name: Residual current protection circuit breaker
• Examined by: Examiner 5

The products shall conform to GB14048. 2 standard. After passing the inspection, they shall be allowed to leave the factory.

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Documents / Resources

ACDC M3EL Series Residual Current Protection Circuit Breaker [pdf] User Manual M3EL Series Residual Current Protection Circuit Breaker, M3EL Series, Residual Current Protection Circuit Breaker, Protection Circuit Breaker, Circuit Breaker, Breaker

References

• User Manual