Surge Protection for Personal Computers and Electronic Equipment. Lightning and power surges can permanently ruin your electronic equipment. Changes in voltage cause lockups and loss of work. This unit will protect your equipment from the threat of bad power. The Personal SurgeArrest series offers affordable surge protection ideal for small office and home equipment such as home PCs, printers and modems. The backup battery is Maintenance-free sealed Lead-Acid battery with suspended electrolyte.