AFDD Requirement & Selection Calculator

How to use the AFDD selection calculator

Choose the project rules basis, premises, and circuit type, then enter the circuit voltage, design current, candidate rating, characteristic, residual sensitivity, and prospective short-circuit current. Read the local-rules status separately from the product-envelope check.

1. Confirm whether the project is governed by IEC/EN, UK, EU, or another local adoption.
2. Enter the circuit design current and fault level.
3. Choose the required B or C characteristic and Type A sensitivity.
4. Review every pass/fail line rather than relying only on the model-family result.

What an AFDD protects against

An AFDD detects current signatures associated with hazardous arc faults. An integrated AFDD-RCBO can also provide residual-current, overload, and short-circuit functions, but each function retains its own marked rating and standard.

• Series arc current may remain below a conventional breaker magnetic threshold.
• An RCD detects residual current but is not a general series-arc detector.
• AFDD application rules vary by jurisdiction, premises, circuit, and adopted standard edition.

VIOX AFDD configuration screen

The product screen uses the published VAF1-40 and VAF3-40M envelope: 240 V AC, 1P+N, 6-40 A, B or C characteristic, Type A 10 or 30 mA, and 6 kA short-circuit rating. A pass means the entered values fit that envelope; it is not a declaration of legal compliance.

Check circuit breaker size · Select an RCD or RCBO · Calculate prospective fault current

AFDD selection example

For a 230 V residential socket circuit with 24 A design current, a 32 A C-curve, Type A 30 mA candidate can fit the published VIOX electrical envelope when prospective fault current remains below 6 kA. The project must still establish whether AFDD protection is required and whether every circuit and installation condition is acceptable.