Arc Detector Breaker (AFDD)

AFDD (Arc Fault Detection Devices) are advanced electrical safety breakers designed to detect dangerous arc faults and prevent electrical fires. Combining arc fault detection with overload, short circuit, and residual current protection, AFDD arc detector breakers offer all-in-one safety for modern electrical installations.

Key Features & Protection Functions

• Series Arc Fault Protection – detects arc faults in series connections
• Parallel Arc Fault Protection – detects arc faults in parallel connections
• Ground Arc Fault Protection – identifies arc faults to ground
• Overload Protection (Long & Short Delay)
• Instantaneous Trip Protection
• Multiple Current Ratings (6A to 63A)
• Built-in Test Button for safety verification
• Visual Indicators: Green (normal), Red (arc fault alarm)
• Configurable Sensitivity Modes via internal setting button

How AFDD Arc Detector Breakers Work

AFDDs use an integrated electronic circuit and MCU to continuously monitor the electrical waveform. The system analyzes arc pulses and distinguishes between harmless arcs (like those from switches) and hazardous fault arcs that can cause fires. When a dangerous arc is detected, the AFDD instantly trips, cutting off power to the circuit.

Technical Specifications

Tripping Time Performance

The AFDD arc detector breaker responds within milliseconds to dangerous arcs:

• ≤ 1s at 3A arc current
• ≤ 0.5s at 6A arc current
• ≤ 0.25s at 13A arc current
• ≤ 0.12s at 40A–63A arc current

Selectable Sensitivity Modes

Internal setting allows adjustment to four working modes for optimal performance in different environments:

• 1 Flash – Interference-resistant mode (low sensitivity) for high-noise environments
• 2 Flashes – Strict mode for factories, offices, and complex power systems
• 3 Flashes – Normal mode for homes, dorms, and clean power environments
• 4 Flashes – Sensitive mode for long circuits with signal attenuation

Application Areas

AFDD arc detector breakers are suitable for virtually any electrical installation where fire safety is critical:

• Residential buildings & apartments
• Office buildings & commercial spaces
• Hospitals, schools, and public facilities
• Shopping malls, supermarkets, and hotels
• Industrial plants and workshops
• Vehicles (ships, trains, RVs) with AC systems

Installation & Mounting

• DIN rail mounted (standard 35mm rail)
• Compact design: 82mm x 35.2mm per pole
• Follow wiring diagram strictly – correct L/N connection is essential
• Test functionality after installation using built-in test button
• Derate current by 0.8 if multiple units are installed in enclosed spaces

Fault Diagnosis Guide

Why Choose AFDD Arc Detector Breakers?

AFDDs provide proactive electrical fire safety by detecting arc faults before they ignite. With integrated protection against overload, short circuit, and ground faults, these devices offer a complete safety solution for modern electrical systems, compliant with international safety standards and designed for reliable performance in diverse environments.

FAQ

Do arc fault breakers actually work?
Yes, AFDD arc fault breakers are highly effective. They use built-in electronic circuits and a microprocessor to continuously analyze the electrical current, accurately identify hazardous arc fault patterns that can cause fires, and instantly cut off power to prevent ignition.

Is it safe to replace an AFCI breaker myself?
It is strongly recommended to have a qualified electrician install or replace an AFDD/AFCI breaker. Incorrect wiring (such as crossing line and neutral wires) can cause the device to malfunction or not work at all, compromising safety. Professional installation ensures it functions correctly within your electrical system.

Where should you not use AFCI/AFDD breakers?
Avoid using standard AFDDs in environments with extreme electrical noise or high harmonic distortion, such as directly with large variable-speed motor drives or some industrial machinery. For such scenarios, select a model with a special "interference-resistant mode" or consult the manufacturer, as nuisance tripping may occur.

How to fix an arc fault breaker that keeps tripping?
First, press the "Test/Release" button to see if it resets. If it trips again immediately, unplug all devices on the circuit and try resetting. If it holds, a plugged-in device may be causing an arc fault. If it still trips with nothing plugged in, there may be a wiring issue (like loose connections or damaged cables) within the circuit walls, which requires investigation by a licensed electrician.