Some manufacturing processes are of critical nature and require high process continuity. Any interruption of such critical processes will result in significant financial losses in the form of lost raw material, lower product quality, expensive maintenance and an adverse reputational impact on the supplier. Process Interruptions may be induced by the supply grid or by non-linear loads in the manufacturing facility. Power outages or voltage sags may interrupt the process. High harmonic current generated by non-linear loads in the plant may cause nuisance tripping or burn electronic cards. Protection against such interruptions is vital for profitable business in critical process industries.