The £30m Mirabella V is a single-masted 'super' yacht, designed by Ron Holland and currently under construction by Vosper Thorneycroft for former Avis head, Joseph Vittoria. The 75m long craft (14m in the beam) is due to sail the Caribbean later this year, when she is expected to reach speeds in excess of 20 knots. For the maritime inclined, she is believed to be the world's largest composite sloop rigged yacht, with a 90m mast and 2,791m2 of sail. Of course, Mirabella V is a very modern vessel and she is equipped with the latest in electronic and electrical systems, which have to be protected. A key design objective was to keep the weight of essential equipment as low as possible, so as not to compromise the vessel's performance, and in this regard, the control panel and switchgear designer, Great Yarmouth based Eastern Switchgear, chose US specification 408V three-phase and neutral Isomax S1, S2 and S3 moulded case circuit breakers (MCCBs) supplied by ABB. Isomax MCCBs can be installed horizontally or vertically, without affecting their performance. The modular units are compact and able to withstand high levels of humidity and temperature, which makes them suitable for this type off application, where ambient conditions are likely to swing from one extreme to another and lack of space dictates rather dense installation. The switchgear, which is fitted to panels located in the engine room and emergency switchboard room, is motorised to allow remote actuation from a central control position onboard the yacht.