Fuse box, feeder junction, submersible to 15 feet, non-magnetic, 250 VAC, single phase, 31 - 60 amp fuses. Provides for feed-thru of up to 75 MCM cable and single phase branch circuit of up to 40 MCM cable. Consists of bus bars secured to an insulator within a 6x9x4-1/2" deep brass enclosure. Compression type terminals are brazed to the bus bars to accept the cables. Type FC21EF fuse clips separate the main buses from the branch buses and accommodate type F62 fuses. Symbol 686.1, Military Part Number M24646/15-002 per MIL-DTL-24646/15A and MIL-DTL-24646A. NSN 5920-00-178-1669. Similar to Symbol 685.1 except the branch circuit is sized for up to 14 MCM cable and it accommodates fuses rated 0-30 amps. Photo is of Symbol 685.1.