CAL9-40AFD: Arc Fault Detection Device AFDD With Integrated RCBO
CAL9-40AFD: Arc Fault Detection Device AFDD With Integrated RCBO

CAL9-40AFD Europe type AFDD with integrated RCBO

Arc fault circuit breakers are also known as arc fault inspection devices. AFDD is mainly to reduce the risk of electrical fire caused by series arc or parallel arc faults between live conductors. , It can check the electric arc fault, disconnect the power circuit before the electric fire occurs, and effectively avoid the electric fire caused by the arc fault. AFDD can also be combined with residual current protection appliances and overcurrent protection appliances to form a multi-purpose protection device.

Product Description
Arc Fault Detection Device

The Changan Electric AFDD provides a full protection solution against electrical ignited fires.

The AFDD (AFCI) provides a full protection solution in one device that enhances consumers’ peace of mind against fires ignited by electrical installations, while adding additional comfort. This all-in-one device gives the consumer full protection in his home and enables the installer to offer and install products that comply with new codes and standards.

Mostly these devices are intended for residential applications (bedrooms, nurseries), hospitals, assisted living, nursery schools, where the residents might have difficulties evacuating, because they are immobile, sleeping or unaware of the threat. As well Shopping centres, airports, train stations such applications, where large groups of people have to be evacuated in case of fire. 
It is recommended to use an AFDD as well in buildings where valuable assents need to be protected, like a museum or a library.

What is an arc fault detection device?

Arc Fault Detection Devices (AFDDs) are devices that protect specifically against arc faults. They automatically trip a circuit when they detect dangerous electric arcs.

They are compact, modular devices that are easily installed in electrical panels along with other protective equipment. Each AFDD is designed to protect an electric, instantly detecting any dangerous arc. You should install AFDDs on the electrical circuits most exposed to risk – e.g., the final circuits that supply socket outlets.

Can arc fault detection devices distinguish between dangerous and working arcs?

Yes. Arc fault detection devices are extremely sensitive and designed to sense and respond only to potentially dangerous arcs. They use a special algorithm to distinguish between dangerous and working arcs – i.e. the harmless sparks that you see when you flick a switch or pull a plug.
This is important as over-sensitive AFDDs could be prone to nuisance tripping – e.g., interrupting a circuit when it senses the slightest harmless arc.

How do arc fault circuit breakers work?

The arc fault detection device technology makes it possible to detect dangerous arcs and thus protect installations.

Such devices have been deployed successfully in the United States since the early 2000s, and their installation is required by the National Electric Code.

Since 2013, the IEC 62606 international standard defines Arc Fault Detection Devices (AFDD) which detect the presence of dangerous electric arcs and cut off the circuit’s power supply to prevent initiating the first flame.

Speed is of the essence as an electrical arc can degrade in a flash (literally), igniting any nearby inflammable material and causing a fire. According to IEC 62606, arc fault detection devices shall react very fast in case of arc faults and isolate the circuit within a limited time. These dangerous electric arcs are not detected by residual current devices nor by circuit breakers or fuses.

Do I need to install Arc Fault Detection Devices (AFDD)?


More specifically, the installation of the AFDD is highly recommended to protect circuits with the highest risk of fire, such as:

  • Protruding cables (risk of knocks)
  • Outside cables (greater risk of deterioration)
  • Unprotected cables in secluded areas (like storage rooms)
  • Aging, deteriorating wiring or wiring for which the connection boxes are inaccessible.

Currently, the cost of AFDD is relatively high, and you can decide whether to use the product in your existing circuit unit to ensure the safety of your property according to the actual situation.

CAL9-40AFD is 1P+N(Pole N could be on/Off arc fault detection devices with integrated RCBO in 6kA breaking capacity, with rated current up to 40A and sensitivity 300mA. LED arc fault indication (During standard operating mode (toggle in ON position), the LED is green. When the toggle is on OFF position or when a fault occurs, the LED is OFF), gray test push button to verify the correct functioning of residual current device. In only 36mm width, they provide protection against arc faults, overload, short-circuit and earth fault currents.


①Arc Fault Protection
②Overload Protection
③Short-Circuit Protection
④Earth-Leakage Protection

Electrical Features Mode Electronic
Type AC, A
Rated current In 6, 10, 16, 20, 25, 32, 40A
Poles 1P+N (Pole N could be on/Off)
Rated voltage Ue 240V~
Insulation voltage Ui 400V
Rated frequency 50Hz
Rated residual operating current(I△n) 10, 30, 100, 300mA
Break time under ≤0.1s
Rated breaking capacity 6,000A
Energy limiting class 3
Rated impulse withstands voltage (1.5/50) Uimp 4,000V
Dielectric test voltage at ind.Freq. for 1min 2kV
Pollution degree 2
Thermo-magnetic release characteristic B, C
Mechanical Features Electrical life 4,000 Cycles
Mechanical life 10,000 Cycles
Contact position indicator Yes
Protection degree IP20
Reference temperature for setting of thermal element 30℃
Ambient temperature (with daily average≤35℃) -5℃~+40℃
Storage temperature -25℃~+70℃
Installation Terminal connection type Cable/Pin-type busbar
Terminal size top/bottom for cable 16mm2 18-5AWG
Terminal size top/bottom for busbar 16mm2 18-5AWG
Tightening torque 2.5Nm 22In-lbs
Mounting On DIN rail EN60715(35mm) by means of fast clip device
Connection Power supply from top
Tripping Current Range Type Tripping current I△/A
AC 0.5I△n<I△<I△n
A Lagging Angle I△n>0.01A I△n≤0.01A
0.35I△n≤I△≤1.4I△n 0.35I△n≤I△≤2I△n
90° 0.25I△n≤I△≤2I△n 0.25I△n≤I△≤2I△n
135° 0.11I△n≤I△≤1.4I△n 0.11I△n≤I△≤2I△n

Characteristics Curves

Thermal Tripping

Magnetic Tripping

Asper IEC60898

No tripping current

Tripping current I2

Time Limits t

Hold current I4

Trip current I5

Time Limits t

B Curve














C Curve

1.13×IN   ≥1h 5×IN   ≥0.1s
  1.45×IN <1h  



Circuit Diagram

Overall and Installation Dimension(mm)

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