30 Amp / 120 Volt Transfer Switch. Dimensions: 6"W x 4-1/8"H x 4-7/16"D Weight: 3.5 pounds. For 30 Amp / 120 Volt systems, ATS 301 provides safe power transfer between shoreline and generator. Electronic generator time delay and chatter-free operation under low line voltage. Removal of base plate converts unit from deck-mount to mounting directly onto Parallax Power Centers.