New Advanced Circuit Interruption (ACI) technology aims to improve the safety of electrical installations while also saving space.
The technology is said to provide a technical solution to dimensioning issues and eliminates the need for an external back-up fuse. The surge arrestor with ACI technology is a pre-wired, complete unit that consists of a base part and plug-in protection modules.
The technology also aims to reduce leakage current, helping to prevent ageing of the protective device and reducing the need to replace arrestors ahead of schedule. In addition, ACI aims to prevent the accidental tripping of the insulation monitoring, thus improving operational safety.
DEHNguard with ACI technology has recently become available in South Africa through DEHN Africa. Its benefits are said to include:
Safe dimensioning and reduced errors: ACI arrestors assist in reducing certain user configuration errors, which can occur when selecting and dimensioning a suitable backup fuse. This potentially increases the availability of the system. The switch/spark gap combination is integrated into and specifically adjusted to the arrestor, eliminating the need for selection of the correct fuse size and tripping characteristics.
Withstanding temporary over-voltages (TOV): Temporary over-voltages can destroy conventional surge protective devices. ACI arrestors are said to have a better TOV withstand, which potentially increases the availability of the system and reduces repairs.
Zero leakage current: The technology in an ACI is designed to ensure that there are no leakage currents.
Smaller connection cross-section: A conductor cross-section of just 6 mm² is sufficient, allowing for easier installation due to smaller radiuses and a shorter wing.
Fulfils future energy sector requirements: The technology is said to equip users for future grid parameter requirements, in which isolated grids and storage systems are changing short-circuiting conditions.