Hager AFDD MCB 25A 30mA ARM925U

Product Code ARM925U


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Hager ARM925U 25A 30mA single module 1P+N AFDD MCB (arc fault detection miniature circuit breaker). Microprocessors detect changes in electrical waveform caused by incorrect wiring, loose electrical connections, rodent bites or defective plugs and cutting the power to an affected circuit providing protection to AC circuits.

AFDD MCB’s designed to retrofit old dual RCD consumer units, where RCD protection is already available. New consumer unit installations typically use a main switch consumer unit and are then fitted with AFDD RCBO’s.

From March 2022 as per BS7671 18th Edition AMD2, AFDDs are mandatory in Higher Risk Residential Buildings, Houses in Multiple Occupation, Purpose built accommodations for students and Care homes and must be fitted at the origin of any single-phase AC final circuits supplying socket-outlets with a rated current not exceeding 32A.

The purpose of AFDD’s is to reduce the estimated 20,000 electrical fires that occur each year in the UK and it is highly recommended for any property to have one installed for the additional protection.

Features of Hager ARM925U AFDD:

  • AFDD MCB (Arc Fault Detection Device)
  • Poles: Single Pole and Neutral (1P+N)
  • Rating current: 25 Amp
  • Trip current: 30mA
  • Single Module
  • Type: B curve
  • Breaking capacity 6kA
  • Mounting: DIN rail type O (symmetrical)
  • Number of poles: 2 - Single pole and neutral
  • IP Rating: IP20
  • Depth: 70mm
  • Height: 125mm
  • Width: 17.5mm
  • Voltage: 230V
  • Standards: EN 62606, EN 60898-1


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Brand Hager
Model Number ARM925U
Product Type AFDD MCB (Arc Fault Detection Device)
Neutral Position Right
Number of Poles 2P
Type of Pole 1P+N
Fixing Mode DIN Rail Type O (Symmetrical)
Tripping Curve B
Rated Operational Voltage Ue 230V
Type of Supply Voltage AC
Rated Insulation Voltage 400V
Max Operating Voltage 253V
Rated Impulse Withstand Voltage 4kV
Rated service breaking capacity Ics AC according to IEC60898-1 6kA
Rated short circuit breaking capacity Icn under 230V AC according to IEC60898-1 6kA
Rating Current 30°C 25A
Trip Current 30mA
Total Power Loss Under IN 6.45W
Electric endurance in the number of cycles 2000
Number of mechanical operations 8000
IP Rating IP20
Operating Temperature -25°C - 70°C
Depth of Installed product 70mm
Height of Installed product 125mm
Width of Installed product 17.5mm
Standards EN 62606, EN 60898-1, ISO 14001
European directive WEEE Concerned

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