CYAFDD-63 Arc Fault Circuit Interrupters (AFCI, also known as AFDD fault arc detector) technology is a latest circuit protection product. Its main function is to detect and distinguish dangerous grounding arc faults, parallel arc faults, and series arc faults, and timely drive the device that disconnects the current to avoid electrical fires. When an arc fault occurs, due to the low current intensity, which is lower than the set value of overcurrent protection widely installed in the power system, especially in the low-voltage distribution field, installing AFCI arc fault circuit breakers at the distribution line terminals can timely detect the arc and cut off the circuit, effectively reducing the losses caused by the arc.

AFDD fault arc circuit breaker is an intelligent circuit protector with integrated design of MCB and RCCB. It can detect and identify fault arcs in the circuit and normal working arcs. Prevent fire hazards caused by faults such as poor contact and insulation in electrical circuits. Integrating fault arc protection, overload protection, short circuit protection, overvoltage protection, surge suppression, and leakage protection.

Field and Application

AFCI fault arc circuit breaker and AFDD fault arc detector are mainly installed in the distribution box of the terminal distribution system, and can also be installed in various control points such as homes, offices, large supermarkets, department stores, hospitals, airports, textile factories, warehouses, oil depots, refineries, entertainment venues, hotels, oil transportation pipelines, etc. This device can be installed and used in any place with electricity, and is widely used for electrical fire prevention.

Product Features

The AFDD fault arc detector adopts embedded system digital circuit control and innovative arc feature recognition algorithm, with small size and strong functions, to achieve automatic monitoring and protection of fault arcs, effectively ensuring the safety of low-voltage distribution lines, electrical equipment, and personnel.

A comprehensive fault arc detection method combining time-domain typical feature detection of line current and frequency-domain FFT is adopted to achieve simultaneous localization in both time and frequency domains.

Its specific functional features are as follows:

(1) Equipped with automatic and manual control functions;

(2) Capable of detecting and identifying dangerous grounding fault arcs, parallel arc faults, and series arc faults;

(3) The device has the function of timely driving to disconnect the current and prevent electrical fires from occurring;

(4) It has many functions such as detecting overcurrent, short circuit, overvoltage, etc;

(5) Equipped with fault memory function for easy fault inquiry and analysis.

(6) Equipped with indicator light alarm function

(7) Capable of multiple rated currents and voltages

(8) Capable of single pole rated connection and segmented function

(9) Capable of displaying fault results

(10) Equipped with free release function

(11) It has the functions of rust prevention, moisture resistance, and electric shock protection

Compared with systems composed of discrete electrical components, it has the characteristic of self coordination between control and protection

AFDD fault arc detector integrates control and protection functions, equivalent to an arc detection identifier+circuit breaker. It effectively solves the problem of matching protection and control characteristics between discrete components, making the coordination of protection and control characteristics more perfect and reasonable.

Compared with circuit breakers and fuses, it has the characteristics of arc detection and protection

The conventional short-circuit protection mechanism based on circuit breakers and fuses can only meet the functional protection of equipment when the short-circuit capacity of the power grid is very small. When an arc fault occurs, due to the low current intensity, it is lower than the overcurrent protection setting value widely installed in the current power system, especially in the low-voltage distribution field. Therefore, it cannot provide comprehensive protection for arc faults.

Compared with sensor based arc detection devices, it has the characteristic of comprehensive detection

Due to the fact that the AFDD fault arc detector sensor must be installed at the location where the fault arc occurs when detecting arc parameters, it brings inconvenience to the comprehensive detection of fault arcs in the power supply line. AFDD solves this problem very well.

Compared with residual current protectors (RCD), it has real-time performance

When series and parallel arc faults occur, the fault impedance reduces the load current, causing the current to be lower than the trip value of the RCD, resulting in the RCD not being able to trip quickly in real time.

Product advantages

Equipped with leakage protection function, greatly improving the reliability of electrical safety.
Technological improvements have been made to the electromagnetic mechanism, including material and process processing, as well as electronic circuit processing, to avoid prolonged heating and overheating of the electromagnetic coil, greatly reducing its operating temperature and thus improving its service life.
Suitable for various types of loads, with high stability.
The rated working current of the faulty arc circuit breaker can reach up to 63A.
Adopting high-performance microcontrollers as the system design to achieve digital control.
The dedicated electromagnetic release mechanism greatly improves the accuracy of overcurrent protection.
When an arc fault occurs, the MCU performs multiple judgments internally. Only when all features match, will the trip action be performed.
The product has a wide range of applications, including residents, enterprises, hospitals, schools, and research institutions.
● Integration: Integrating short-circuit protection, leakage protection, and arc protection into one
● Stability: Will not affect its detection capability due to shielding from inhibitory loads or EMI loads
Multi domain detection: time domain, frequency domain
Flexible installation methods: plug-in, bolt type, and rail type installation.

main structure

Main body: The AFCI arc fault circuit breaker mainly consists of a circuit breaker module, a leakage module, a power module, a signal conditioning module, a release module, and a communication interface module.
Power module: supplies power to the relevant components inside the AFDD (arc fault detection device).
Signal conditioning module: The current signal in the main circuit is passed through the signal conditioning module through a line current transformer. The signal conditioning module amplifies, rectifies, and filters the signal before sending it to the microcontroller for processing.
◆ Release module: In the AFCI arc fault circuit breaker, the electromagnetic structure of the release module adopts a new energy-saving technology, which minimizes the iron core loss and short-circuit loss of the switch electromagnetic system, and maximizes energy savings. An additional buffer device has been added to reduce the energy impact of the electromagnetic system, thereby improving the switch's closing performance and extending its service life. The operating mechanism of the release module can receive fault signals detected by the main control chip MCU, cut off the coil circuit through control contacts, and disconnect the main circuit by the electromagnetic mechanism. After troubleshooting, open the operation button to reset.
Communication interface module: Through this module, real-time data such as current, voltage, current phase, arc signal, etc. can be transmitted to the terminal computer, enabling remote monitoring. The following figure shows the current data information sent by the MCU to the upper computer when a series arc occurs. The data processing module utilizes a self-developed dedicated AFDD fault arc detector upper computer development platform for data analysis and feature parameter extraction. Establish a PC simulator to perform pre simulation of algorithms on the PC side, with execution language compatible with microprocessors.

Working principle

The main control chip MCU of the AFCI fault arc circuit breaker detects the current signal in the main circuit in real time. When a fault arc is detected in the main circuit, the microcontroller sends a trip signal and the trip circuit performs a trip operation.
Overload and other protections: The main control chip MCU of the AFCI fault arc circuit breaker will also detect faults such as overload, leakage, undervoltage, overvoltage, overcurrent in the main circuit in real time, and send fault signals to the release to disconnect the circuit and achieve protection operation.

Electrical fire protection equipment, in compliance with IEC/EN-62606, GB/T31143-2014;
RCBO is independent of line voltage and complies with IEC/EN61009 and GB14048.2;

2-pole/1P+N: The left L end is protected;
Optional installation on the right side of the N-pole;
LED lights (green/red/yellow) indicate: overload, leakage, overvoltage, undervoltage, short circuit, AFDD fault arc alarm;

LED lights (green light (operation and communication)/yellow light (overvoltage, undervoltage, overload)/red light (leakage alarm, fault arc alarm)) indicate;
Can be installed on standard busbars;
Dual purpose terminals on both sides (raised/open);
• Bus positioning can be selected above or below;
When installed on the busbar, the sub space is large and can be independently disassembled;
• Secure connection indication;
The rated current indicated by the color switch (MCB component);
Complete accessories suitable for subsequent installation;
The test key 'T' must be pressed once a year;
The responsibility requirement must be communicated to the system operator in a verifiable manner. In special conditions (such as humid and/or dry environments, environments with pollution and/or corrosive conditions, environments with large temperature fluctuations, devices with overvoltage risks due to switchgear and/or atmospheric discharge, handheld devices, etc.), it is recommended to test once a month. If the red and yellow LEDs flash alternately, further testing is required;
Press the test button "T" only for functional testing of RCD. This test does not measure the grounding resistance (RE), nor does it perform checks for redundant grounding wire conditions. These tests must be conducted separately; •
Model A: Protection against special forms of non smooth pulsating DC residual current;
• Li/A， Protecting against special forms of non smooth pulsating DC residual current with a certain delay can effectively prevent accidental tripping.

Compliant with GB/T11681-2013 standard

1. The maximum breaking time of AFDD (arc fault detection device) at rated voltage of 220V is shown in the table

Operating instructions

◆ Button Description
Test button: used to test the leakage function of AFCI. Press the "T" test button to disconnect the AFCI arc fault circuit breaker, otherwise it is considered normal.
Handle: Used to connect and disconnect circuits. Turn the handle to the ON position to connect the circuit, and to the OFF position to disconnect the circuit.
◆ Operating instructions
Place the handle of AFCI in the OFF position and correctly connect it to the circuit.
Place the handle of AFCI in the ON position and connect the circuit.
Arc test: Pressing the test button AFDD to trip is normal. If it is not normal, please replace it.
Place the handle of AFCI in the ON position and connect the circuit.
◆ LED Description
The LED circuit on the basic wiring diagram is working normally, with the green light on and the red light off. If the red light is on, it indicates that there is a problem with the circuit during the self check process of the AFDD arc fault circuit breaker. Restart AFCI. If the above situation still occurs, please replace AFCI in a timely manner.

Usage and maintenance:

1. The leakage, overload, and protection characteristics of AFCI arc fault circuit breakers are formulated by the manufacturer, and users can install them directly without opening the back cover for arbitrary adjustment.
2. The function of the test button for AFCI arc fault circuit breaker is to check the reliability of the leakage protection characteristics when the test button is pressed in the connected state or once a month after running for a certain period of time during new installation. When in the connected state, the green light is on and the red light is off; After pressing the leakage test button, the release device trips, indicating that the AFCI arc fault circuit breaker is normal. Otherwise, the AFDD arc fault circuit breaker is broken and needs to be replaced with a new one.
3. The AFCI arc fault circuit breaker is disconnected due to a fault in the protection circuit (circuit arc, poor contact, line damage, leakage, overcurrent, overload, short circuit). The cause should be identified, and after troubleshooting, the AFCI handle should be placed in the ON position to connect the circuit.
4. Refer to the basic wiring diagram: This product does not allow power to enter from the output terminal.
5. The AFCI arc fault circuit breaker does not protect against the risk of electric shock caused by simultaneous contact with two wires of the protected circuit.
6. Refer to the basic wiring diagram for wiring: When wiring, be sure to pay attention to the installation method of the left neutral wire and the right live wire for the incoming and outgoing wires, and ensure that the wiring terminals are tightly pressed.