Best Arc Fault Detection Devices for Home Safety: 2025 Expert Review
OR Electrics
18th Edition Qualified Electrician
Electrical fires are a homeowner's worst nightmare. In many of the older properties I visit across Leeds, loose connections or compromised wiring—often hidden behind plaster or under floorboards—can sit silently sparking (arcing) long before a standard fuse blows. This is where Arc Fault Detection Devices (AFDDs) come in.
Unlike standard circuit breakers that strictly look for overloads, an AFDD contains a micro-computer that analyses the electrical signature of your circuit. It's looking for the specific chaotic patterns of an electrical arc, cutting the power instantly to prevent ignition. It's properly clever kit, but it can be confusing to know what you actually need.
In this review, I'm looking at two specific units available on the market: a high-capacity option suitable for main distribution, and a specialist DC unit for modern homes with solar installations. Please remember, fitting these requires a qualified electrician to ensure your consumer unit remains compliant.
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Specs vs. The Real World
The Spec: "Universal Protection"
"Marketing suggests one device stops all electrical fires in the home."
AFDDs specifically stop series and parallel arcs (sparking). They do not replace RCDs (which stop electric shocks) or MCBs (which stop overloads). You need a coordinated approach, not just one magic gadget.
The Spec: "Retrofit Compatibility"
"You can just clip these into any old fuse box."
In reality, consumer units have strict space limitations and busbar arrangements. Mixing brands is generally frowned upon in the UK regulations (BS 7671) due to type-testing. Only install if compatible with your enclosure.
My Top 3 Recommendations
Three options to cover different needs and budgets
AFCI Arc Fault Circuit Interrupter AFDD Arc fault Detection Device Fire Prevention Unit by Arc Monitoring TOWAFDD-63(C16)
Arc Monitoring
This unit from Arc Monitoring offers a robust 63A rating, making it a heavy-duty option for circuits requiring significant power handling. Whilst priced at the higher end for a single module, its specification suggests it is designed for demanding residential or light commercial environments.
The Good
- High 63A rating suitable for heavier loads
- Compact design aids installation
- Protects against both series and parallel arcs
The Bad
- Generic branding may make sourcing spares difficult
- High initial cost for a single module
Installer Tip:
Because of the 63A rating, ensure your cable sizing is appropriate for the load. Don't just swap a 32A breaker for this 63A unit without verifying the circuit wiring can handle the potential current, otherwise, you're creating a fire risk rather than preventing one.
Priced at £258.14 at the time of writing
Check Price on AmazonKOSBO AFDD-32 Arc Fault Device Tester
KOSBO
It is crucial to note that this KOSBO unit is specialised for DC (Direct Current) systems, such as solar photovoltaic setups or battery storage, which are becoming common in modern Leeds eco-homes. It features a magnetic field system to extinguish DC arcs, which are notoriously harder to stop than AC arcs.
The Good
- Essential safety for homes with Solar PV arrays
- Specialised magnetic arc extinguishing chamber
- Fast trip times for DC short circuits
The Bad
- NOT suitable for standard AC household socket circuits
- Premium price point
Installer Tip:
Do not install this on a standard AC ring main. This is specifically for DC power distribution (like solar inverters). DC arcs don't have a 'zero crossing' point like AC, so they sustain themselves; this device's magnetic blow-out feature is vital for safety in those specific setups.
Priced at £356.43 at the time of writing
Check Price on AmazonFrequently Asked Questions
What is the difference between an AFDD and a standard RCD?
Are AFDDs mandatory in the UK?
Can I install an AFDD myself?
Why are these AFDDs so expensive?
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