Victron Anti-Islanding Box 63 A, single phase and three phase. The Anti-Islanding Box 63 A single phase and three phase is a combination of an islanding protection device, a Ziehl UFR1001E, two line connected connectors and a main circuit breaker. It is suitable for both single-phase and three-phase systems. It is rated for up to 63 A per phase and all parts are conveniently enclosed in an IP65 rated enclosure. The Anti-Islanding Box can be added to a mains-fed inverter/charger system (ESS) to meet local islanding protection regulations.