This specification covers fuse holders for use in aircraft electric circuits in conjunction with MIL-F-5372 current limiter type fuses. These fuse holders are suitable for operation at -54??o 125?? Classification: Style: A style of fuse holder block shall consist of all part numbers covered by one military standard (MS) or specification sheet. For example: all part numbers of MS24000 shall be the same style (see 6.3). Poles: The number of individual circuits (poles) shall be 1@ 2 or 3 as shown on the applicable military standard or specification sheet.