The safety and availability of the electrical installation is increased, and valuable space saved. In addition, errors made when selecting or installing the back-up fuse or choosing the right conductor cross-section can be eliminated. The only cross-section which now needs to be considered for the connection cables of DEHNguard ACI is 6mm². This saves the valuable time previously spent on dimensioning the cross-sections. 6mm² Cu also makes installation easier because the radiuses are smaller and the wiring shorter. One must, however, ensure that all live conductors are wired so that they are short-circuit and earth fault proof.
Thanks to galvanic separation by the ACI unit, the new DEHNguard ACI enables operation without any leakage current and with a high degree of TOV withstand. The technology in an ACI arrester eliminates the occurrence of leakage current. This prevents mature ageing of the protective device and saves the time and expense of replacing arresters ahead of schedule. DEHNguard ACI also prevents the accidental tripping of the insulation monitoring and contributes towards operational safety. Conventional solutions with fuses or circuit breakers are not ideal for protecting an SPD. High impulse current in normal operation necessitates high trigger current in case of a fault when the back-up fuse has to disconnect. Here, ACI is perfectly coordinated with the surge protection and supply reliability of the system. This is the next evolutionary stage for protecting an SPD whilst also saving time, space and material and, as a result, costs.