Electrical safety is the cornerstone of residential, commercial and industrial buildings, and arc faults are one of the main causes of electrical fires worldwide. Statistics show that nearly one-third of all electrical fires are triggered by dangerous arc faults, which often occur due to loose connections, aging wires, insulation damage or improper use of electrical equipment. Afdd Protection (Arc Fault Detection Device Protection) has emerged as a crucial solution to this hidden danger, providing comprehensive and real-time protection against arc faults. Zhejiang C&J Electrical co., ltd. (referred to as C&J Electrical) is committed to developing high-performance electrical protection devices, and its CJAF1-40 series AFDD integrates multiple protection functions, delivering reliable Afdd Protection for various low-voltage power distribution scenarios.
What is AFDD? Core Definition & Working Principle
What are Arc Fault Detection Devices? AFDDs are protective devices installed in consumer units to provide protection from arc faults. They use microprocessor technology to analyse the waveform of the electricity being used to detect any unusual signatures which would signify an arc on the circuit. Specifically, AFDD (Arc Fault Detection Device) is an intelligent protective device designed to detect and interrupt dangerous arc faults in electrical circuits, and Afdd Protection refers to the full-range protection service provided by this device to prevent electrical fires caused by arc faults.
Different from traditional protective devices such as fuses and circuit breakers that only respond to overcurrent and short-circuit faults, AFDDs focus on detecting arc faults—an invisible and insidious hazard. Dangerous arcs can generate extremely high temperatures (up to thousands of degrees Celsius) in an instant, which can ignite surrounding combustible materials (such as wires, furniture, and decorations) and trigger fires. Afdd Protection uses advanced microprocessor technology to continuously monitor and analyse the current waveform in the circuit, accurately distinguishing between harmless normal arcs (such as those generated by switch contacts) and dangerous fault arcs (series arcs and parallel arcs), and tripping quickly to cut off the circuit when a dangerous arc is detected, thus eliminating the fire hazard at the source.
Core Overview of Afdd Protection
Afdd Protection is a professional electrical fire prevention protection system centered on AFDD devices, which is mainly used in low-voltage power distribution systems of residential, commercial and industrial buildings. Its core purpose is to detect dangerous arc faults in real time, interrupt the circuit in a timely manner, and prevent electrical fires caused by arc ignition. With the continuous improvement of global electrical safety standards, Afdd Protection has become an indispensable part of modern electrical installation systems, especially in scenarios with high fire risks.
C&J Electrical’s CJAF1-40 series AFDD is a high-performance single-module AFD/RCBO with a switched N pole, which perfectly interprets the core value of Afdd Protection. It integrates multiple protection functions in one compact module, not only realizing arc fault detection for both series and parallel arcs, but also integrating residual current protection (earth leakage detection) and overcurrent/short-circuit protection. This integrated design not only simplifies the power distribution system structure, but also provides all-round protection for the installation and users, effectively reducing the risk of electrical fires.
Core Functions of Afdd Protection (Based on C&J Electrical CJAF1-40 Series)
The Afdd Protection provided by C&J Electrical’s CJAF1-40 series AFDD is comprehensive and reliable, integrating multiple core protection functions to meet the safety needs of various scenarios. Its main functions include:
- Dual arc fault detection: Accurately detects both series arcs and parallel arcs—common dangerous arc faults in circuits. Through advanced microprocessor waveform analysis technology, it can distinguish dangerous arcs from normal arcs, avoiding false tripping and ensuring reliable protection.
- Residual current protection (earth leakage detection): Integrates the function of a residual current operated device, which can detect earth leakage faults in the circuit in real time. When the residual current exceeds the rated value (30mA, 100mA, 300mA optional), it trips quickly to protect personal safety from electric shock.
- Overcurrent and short-circuit protection: Equipped with overcurrent and short-circuit protection functions, it can respond to overcurrent faults caused by overload and short-circuit faults in the circuit in a timely manner, with a rated breaking capacity of 6KA, effectively cutting off the fault circuit and protecting electrical equipment from damage.
- Overvoltage protection: Built-in overvoltage protection function, which can detect abnormal voltage increases in the circuit (270V-300V). When the voltage exceeds the safe range, it trips to prevent electrical equipment from being damaged by overvoltage.
- Surge current resistance: Withstands surge current up to 3KA (8/20 μs), which can resist the impact of surge current in the circuit and ensure the stable operation of the device itself and the power distribution system.
- Easy retrofitting and installation: With a single module width, it does not require larger consumer units and can be easily retrofitted into existing power distribution installations, reducing installation costs and construction difficulty.
- High environmental adaptability: Suitable for a wide ambient temperature range (-25°C to +40°C) and storage temperature range (-25°C to +70°C), with a pollution degree of 2, which can adapt to various complex indoor environments.
Application Scenarios of Afdd Protection
With the advantages of comprehensive protection, high reliability and easy installation, Afdd Protection is widely used in various scenarios that require electrical fire prevention, especially in places with dense personnel, valuable property or high fire risks. The main application fields are as follows:
- Residential buildings: Family houses, apartments, villas, etc. Used in household distribution boxes to protect the power supply circuits of bedrooms, living rooms, kitchens and balconies, preventing electrical fires caused by aging wires, loose sockets and improper use of household appliances.
- Commercial buildings: Shopping malls, supermarkets, office buildings, hotels, restaurants, etc. These places have complex electrical circuits, dense electrical equipment and large power consumption, and Afdd Protection can effectively prevent arc faults and ensure the safety of personnel and property.
- Public facilities: Schools, hospitals, nursing homes, libraries, stadiums and other public places. These places have a large number of people, and electrical safety is particularly important. Afdd Protection can provide reliable fire prevention protection and avoid group safety accidents.
- Industrial workshops: Light industrial workshops, warehouses, production lines and other places. It can protect the power supply circuits of production equipment and lighting systems, preventing electrical fires caused by equipment aging and circuit faults, and ensuring the normal operation of production activities.
- Other scenarios: Data centers, communication base stations, intelligent buildings, etc. These places have high requirements for the stability and safety of the power supply system, and Afdd Protection can provide all-round protection for the power distribution system.
C&J Electrical CJAF1-40 Series AFDD: Core Advantages & Technical Specifications
As a core product of C&J Electrical, the CJAF1-40 series AFDD is specially designed to provide high-quality Afdd Protection for global users. It complies with international standards, integrates multiple functions, and has the advantages of compact structure, high reliability and flexible installation. Its core advantages, product overview and technical parameters are as follows:
Product Overview & Core Advantages
- Integrated multi-protection: Combines arc fault detection (series + parallel arcs), residual current protection (earth leakage), overcurrent/short-circuit protection and overvoltage protection in one, providing all-round Afdd Protection and avoiding the need to install multiple protective devices separately.
- International standard compliance: Designed and manufactured in accordance with IEC/EN 62606 and IEC 61009-1 international standards, ensuring product quality and safety performance, and compatible with global application scenarios.
- Compact and easy to retrofit: Single module width design, no need for larger consumer units, can be easily retrofitted into existing power distribution installations, suitable for both new construction and renovation projects.
- Multiple specifications optional: Rated current ranges from 6A to 40A, trip curves include B, C, D, and rated residual operating current has 30mA, 100mA, 300mA options, adapting to different power consumption scenarios.
- High safety and reliability: High rated breaking capacity (6KA), surge current resistance (3KA), and excellent electrical and mechanical life (4,000 electrical cycles, 20,000 mechanical cycles), ensuring long-term stable operation and reliable protection.
- Flexible connection: Supports cable and busbar connection, input connection capacity up to 25mm², output connection capacity up to 16mm², meeting different wiring needs.
- OEM customization support: Provides OEM brand customization services, with multiple specifications available, wide application scenarios and high safety performance, meeting the personalized needs of different customers and markets.
Main Technical Parameters
|
Parameter
|
Details
|
|---|---|
|
Standard
|
IEC/EN 62606 & IEC 61009-1
|
|
Rated Current (In)
|
6A, 10A, 16A, 20A, 25A, 32A, 40A
|
|
Trip Curve
|
B, C, D
|
|
Model
|
Electronic
|
|
RCD Type
|
AC, A
|
|
Pole
|
1P+N
|
|
Rated Voltage (Ue)
|
240V
|
|
Insulation Voltage (Ui)
|
500V
|
|
Rated Frequency
|
50Hz
|
|
Energy Limiting Class
|
3
|
|
Rated Residual Operating Current (IΔn)
|
30mA, 100mA, 300mA
|
|
Rated Breaking Capacity (Icn)
|
6KA
|
|
Rated Operating Short Circuit Breaking Capacity (Ics)
|
6KA
|
|
Rated Residual Making and Breaking Capacity (IΔm)
|
2000A
|
|
Rated Impulse Withstand Voltage (Uimp)
|
4KV
|
|
Surge Current Resistance (8/20 μs)
|
3KA
|
|
Overvoltage Protection
|
270V-300V
|
|
Electrical Life
|
4,000 Cycles
|
|
Pollution Degree
|
2
|
|
Mechanical Life
|
20,000 Cycles
|
|
Protection Degree
|
IP20
|
|
Ambient Temperature
|
-25°C ~ +40°C (daily averages 35°C)
|
|
Storage Temperature
|
-25°C ~ +70°C
|
|
Terminal Connection Type
|
Cable, busbar
|
|
Connection Capacity (Input)
|
25mm²
|
|
Connection Capacity (Output)
|
16mm²
|
|
Tightening Torque (Input)
|
2.5Nm
|
|
Tightening Torque (Output)
|
1.2Nm
|
Why Choose C&J Electrical CJAF1-40 Series for Afdd Protection?
In the field of Afdd Protection, the CJAF1-40 series AFDD from C&J Electrical has obvious competitive advantages, becoming the preferred choice for customers pursuing comprehensive protection, high reliability and cost-effectiveness:
- Comprehensive protection without blind spots: Integrates multiple protection functions, covering arc faults, leakage, overcurrent, short circuit and overvoltage, providing all-round Afdd Protection and eliminating potential electrical fire hazards.
- International standard quality: Complies with IEC/EN 62606 and IEC 61009-1 standards, strict quality control, stable and reliable performance, and can pass global relevant certifications, suitable for export and global application.
- Cost-effective and easy to install: Single module design, small size, easy to retrofit and install, reducing installation space and construction costs; integrated design avoids the need to purchase and install multiple devices separately, saving overall costs.
- Flexible adaptation: Multiple specifications, trip curves and residual current options, adapting to different power consumption scenarios and user needs, with strong versatility.
- Durable and long-lasting: Excellent electrical and mechanical life, high environmental adaptability, can work stably in various complex environments, reducing maintenance and replacement costs.
- Customizable services: Supports OEM brand customization, can be adjusted according to customer specifications, brand needs and market demands, meeting personalized needs.
- Professional technical support: C&J Electrical has a professional technical team that can provide customers with tailored Afdd Protection solutions and comprehensive after-sales services, solving customers’ worries.
Get in Touch
If you have any questions about the CJAF1-40 series AFDD and Afdd Protection, such as product specifications, technical details, customization needs, or bulk orders, please feel free to contact C&J Electrical. Our professional team will provide you with high-quality electrical fire prevention solutions and reliable services to ensure the safety and stability of your electrical system.
Post time: Feb-06-2026