Axiom Arc Fault Detection Devices are protective devices installed in Axiom consumer units to protect against arc faults. Once an Arc is detected the unit will disconnect the affected circuit, preventing a fire. Combined RCBO and Arc Fault Detection Device (AFDD) provides protection against Series & Parallel Arc Faults, Overcurrent, Short Circuit & Residual Current Faults. MCB Technology Prevents Overload Currents And Overheating, RCD Technology Which Prevents Electrical Shocks, All In One Single Compact Module.