This paper presents the design of the arc fault detection circuit that is able to detect three different signals prior to the occurrence of an arcing fault in the low voltage switchboard. There are pressure, heat and light signals. The simulation results show that the proposed arc fault detection circuit will activate the relay and send a trip signal to the circuit breaker if the illumination level in the interior of the low voltage (LV) switchboard is more than a predetermined value and at the same time both the pressure and temperature detectors detect a pressure and temperature level which are higher than the reference value. This is to ensure that no fault tripping signal is sent to the circuit breaker and therefore avoid unnecessary power shut down.
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