AFDD Manufacturers | China AFDD Factory & Suppliers
Arc Fault Detection Device
Arc Fault Detection Device
Product Category

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Arc Fault Detection Devices for Electrical Fire Protection

An Arc Fault Detection Device (AFDD) monitors electrical waveforms to identify hazardous arc faults and disconnect the affected circuit before excessive heat can develop into an electrical fire.

CNC Electric offers standalone AFDD, AFDD+MCB, AFDD+RCBO and AFDD+Isolator solutions for single-phase and three-phase distribution systems. Different configurations combine arc-fault detection with overcurrent, short-circuit, residual-current or isolation functions.

Arc-Fault Detection

Detects hazardous arc characteristics caused by damaged cables, loose connections, ageing insulation or broken conductors.

Multiple Configurations

Available as standalone AFDD, AFDD+MCB, AFDD+RCBO and AFDD+Isolator products.

Single & Three Phase

Product options are available for single-phase branch circuits and three-phase four-wire distribution systems.

IEC-Based Protection

AFDD products are designed for IEC-based installations, with the applicable standard depending on the product configuration.

AFDD Protection Configurations

AFDD refers specifically to the arc-fault detection function. Other protective functions depend on whether the AFDD is combined with an MCB, RCBO or isolating device.

ConfigurationArc-Fault ProtectionOverload ProtectionShort-Circuit ProtectionResidual-Current Protection
Standalone AFDD Included External device required External device required External device required
AFDD+MCB Included Included Included Not integrated
AFDD+RCBO Included Included Included Included
AFDD+Isolator Included External device required External device required External device required

Selection note: Do not assume that every AFDD provides overload, short-circuit or leakage protection. Always check the complete product configuration and technical documentation.

CNC Electric AFDD Product Range

CNC provides different AFDD structures for branch-circuit protection, compact consumer units and three-phase distribution systems.

ModelConfigurationMain Protection FunctionsKey FeatureTypical Application
AFDD Fault Arc Protector Standalone AFDD Arc-fault detection Multiple selectable working modes for different electrical environments Arc-fault protection coordinated with separate circuit-protection devices
AFDD9RL-63 1P+N AFDD+RCBO Arc fault, overload, short circuit and residual current 6–63 A range with LED operating and fault indication Residential and commercial branch circuits
AFDD9LE-63Y AFDD+RCBO Arc fault, overload, short circuit and residual current Integrated multi-function branch-circuit protection Single-phase final distribution circuits
AFDD9NL-40 1P+N AFDD+RCBO Arc fault, overcurrent, short circuit, residual current and overvoltage Compact 18 mm structure designed particularly for UK applications Space-limited consumer units and final circuits
AFDD9-63 Three-phase four-wire AFDD+MCB Arc fault, overcurrent and short circuit Detects arc faults in individual phases and between phases Three-phase distribution and final circuits
AFD9-63 Three-phase four-wire AFDD+Isolator Arc-fault detection and circuit disconnection Three-phase arc-fault monitoring with isolation function Systems using separately coordinated overcurrent and leakage protection

Typical AFDD Applications

AFDDs are particularly valuable in locations where an undetected electrical arc could create a serious fire risk, threaten occupants or damage valuable property.

  • Homes, apartments and residential distribution boards
  • Hotels, dormitories and buildings with sleeping accommodation
  • Schools, hospitals, offices and public buildings
  • Buildings constructed with combustible materials
  • Warehouses and locations containing flammable materials
  • Museums, archives and buildings containing irreplaceable assets
  • Commercial and industrial branch circuits
  • Three-phase distribution and infrastructure systems

Actual AFDD installation requirements depend on national wiring regulations, building use, fire-risk assessment and project specifications.

How to Select the Right AFDD

Begin with the circuit type and required protection functions, then verify the electrical ratings, installation space and applicable certification.

Circuit RequirementRecommended ConfigurationCNC Product Option
Arc-fault detection coordinated with separate protection Standalone AFDD AFDD Fault Arc Protector
Arc fault, overload and short-circuit protection AFDD+MCB AFDD9-63
Arc fault, overload, short circuit and leakage protection AFDD+RCBO AFDD9RL-63 or AFDD9LE-63Y
Compact 1P+N protection with overvoltage function Slim AFDD+RCBO AFDD9NL-40
Three-phase arc-fault and overcurrent protection Three-phase AFDD+MCB AFDD9-63
Three-phase arc-fault detection with circuit isolation AFDD+Isolator AFD9-63

Before ordering, confirm the rated voltage, rated current, number of poles, breaking capacity, trip curve, residual-current sensitivity, installation width and required product standards.

  • What Is an AFDD and How Does It Work?

    An Arc Fault Detection Device (AFDD) continuously analyzes electrical waveforms to identify hazardous arc faults. When a dangerous arc is detected, it disconnects the affected circuit to help reduce the risk of electrical fires.

  • What Types of Arc Faults Can an AFDD Detect?

    An AFDD can detect hazardous series and parallel arc faults caused by damaged cables, loose terminals, broken conductors, deteriorated insulation or poor electrical connections. Detection capability depends on the specific product design.

  • What Is the Difference Between an AFDD, MCB and RCBO?

    An AFDD detects dangerous arc faults, while an MCB protects against overloads and short circuits. An RCBO additionally provides residual-current protection. An integrated AFDD+RCBO combines these functions in one device.

  • Does Every AFDD Include Overload and Leakage Protection?

    No. A standalone AFDD mainly provides arc-fault detection. Overload and short-circuit protection require an AFDD+MCB or AFDD+RCBO, while residual-current protection is included only in an AFDD+RCBO configuration.

  • Where Are AFDDs Commonly Used?

    AFDDs are commonly installed in homes, apartments, hotels, schools, hospitals, offices, warehouses and buildings containing combustible materials or valuable assets. Local wiring regulations and project requirements should determine whether AFDD protection is required.

  • How Do I Select the Right AFDD?

    Confirm the circuit phase, rated voltage, rated current, number of poles, breaking capacity, trip curve and required protection functions. Also check whether residual-current protection, overvoltage protection or a compact installation width is required.