The Lewden P4 series of combined AFDD &RCBO - Quality approved

The Lewden P4 series of combined AFDD &RCBO provides the highest degree of protection, safeguarding final circuits against the effects of:

  • Over Current
  • Residual Current
  • Arcing Faults
  • Over Voltage
  • Over Voltage Protection

AFDDs can also mitigate the risk fire caused by faults within the whole electrical Installation, both within the fixed wiring and the cabling of equipment connected to it.

How does the AFDD work?

The integral AFDD uses microprocessor-based technology to continuously monitor the electrical circuit, identifying unintentional arcs caused by broken or damaged cables or poor connections. AFDD’s can differentiate between “dangerous arcing” and “normal arcing” caused by the normal operation of equipment such as vacuum cleaners drills and electrical appliances and will disconnect the supply when identifying arcing faults.

Key Features

The P4 Combined AFDD RCBO is designed for integration within the Lewden range of distribution boards and is fully interchangeable with the Lewden range of 6kA single module MCBs and RCBOs.

  • Available in current ratings of 6-40A, incorporated within a single module width.
  • The device combines a microprocessor based AFDD with a 1P+ Switched Neutral RCBO.
  • Incorporating a 30mA class A RCD and a 6kA MCB.
  • Suitable for use on TN-S, TN-C-S & TT network systems.
  • The switched Neutral pole makes the device suitable as a means of double pole isolation, and is particularly appropriate for installations with TT Earthing Systems where it is necessary to disconnect all live conductors to achieve safe isolation of individual circuits (BS7671:2018 Regulation 462).

Fault identification

Following an electrical fault in the load circuit the P4 device will trip. Upon re-closing, the LED will flash in sequence to signify the reason for the last break of circuit.

Quality approved

To ensure commitment to safety and quality, the Lewden P4 Series Combined AFDD & RCBO has been independently laboratory tested and certified by Intertek, and bears the European safety 'S Mark'. The S mark is a voluntary certification scheme demonstrating that the product continually meets all relevant technical safety requirements, verified by regular inspections of the manufacturing facility by Intertek.


What causes Arc Faults?

Unintentional arcing faults can occur due to several reasons, ranging from poor installation or accidental damage to cabling and equipment, to deterioration of the cable over time due to external factors. These faults can occur within the fixed cabling installation, or on portable equipment connected to the fixed wiring installation. Electrical arcing faults may be caused by (but not limited to):

  1. Trapped damaged or crushed cables
  2. Cable damage during installation or ongoing usage
  3. Damage to wire insulation
  4. Rodent damage
  5. Loose connections
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