MIL-DTL-917F(SH)
d. Fuses with mechanical pop-up blown indicators shall be located so that the position of the indicators may
be readily seen.
e. In connections with knife blade type fuses, to prevent possible dislodging under shock and vibration
conditions, a melamine bar, which can be easily and safely removed, may be provided across the fuse barrels.
f. Information plates shall be provided for each set of fuses and shall indicate the fuse type designation,
schematic reference designation, the circuit, rated rms interrupting current, and maximum interrupting circuit
voltage (for example, F03A250V3A-S, F101, regulator circuit, DWG. XXXXXX, 100 A, 250 Vrms).
g. When fuses are required to be mounted in fuse clips, copper clad steel fuse clips in accordance with
A-A-55507 and A-A-55507/1 shall be used for fuse ratings up to 60 amperes.
h. When used, the dead front indicating type shall be mounted on the front of the equipment. For equipment
with a drawer or hinged front panel, the fuseholders may be mounted on the front panel.
i.
Fuseholders shall be installed so that the test probe hole is located at the bottom.
3.13.2.7 Fuses, non-standard types. Use of standard fuses is the preferred practice. Where use of non-standard
fuses is approved, one spare fuse for every three fuses of the specific type and rating being used shall be located in
the equipment and marked as spares. Neon lamp type of blown fuse indicators shall not be used for voltages below
90 V.
3.13.2.8 Fuseholders.
3.13.2.8.1 For F02, F03, and F60 fuses. Fuseholders for use with Styles F02, F03, and F60 fuses shall be
Types FHL10G, FHL11G, FHL12G, FHL32W, FHL33W, or FHL35W indicating type fuseholders in accordance
with MIL-PRF-19207 when the circuit voltage is 90 V or greater. When the circuit voltage is less than 90 V, Types
FHL18G, FHL29G, or FHL30G fuseholders in accordance with MIL-PRF-19207 (incandescent lamp indicators)
shall be used except where they will not indicate properly or circuit functions would be adversely affected by their
use. In such cases, Type FHN28WB fuseholder (non-indicating type) shall be used.
3.13.2.8.2 For F62 fuses. Fuseholders for use with Style F62 fuses shall be Type FHL14G in accordance with
MIL-PRF-19207.
3.13.2.8.3 For F63 fuses. Fuseholders for use with Style F63 fuses shall be Type FHL15G in accordance with
MIL-PRF-19207.
3.13.2.8.4 Indicator type. All indicator type fuseholders shall be installed so that the indicators are visible from
outside the equipment at all times.
3.13.2.8.5 Non-indicator type. Non-indicating fuseholders for use with F60 fuses shall be Type FHN41WB in
accordance with MIL-PRF-19207.
3.13.3 Circuit breakers. Current time sensing (CTS) and signaling devices, when used for protection against
overcurrent, shall be supplied in accordance with MIL-S-24561. Circuit breakers shall conform to the following
specifications:
Specification
Type
ACB Open frame up to 500 Vrms, 355 VDC
MIL-DTL-17587
AQB and NQB Insulated enclosure, up to 500 Vrms, 250 VDC
MIL-DTL-17361
ALB and NLB Insulated enclosure, up to 125 Vrms, 125 VDC
MIL-C-17588
3.13.4 Resistors and rheostats. Resistors shall be chosen and applied using the guidance in MIL-HDBK-199 as
modified by the additions, limitations, and restrictions specified herein and in the applicable equipment
specification. Guidance for resistors and rheostats from ½ to 50 watts can be found in MIL-HDBK-199. Rheostats
and variable resistors used for adjustments during equipment operation for ratings up to 50 watts shall be in
accordance with Form EW of MIL-DTL-15109 or MIL-PRF-22. Above 50 watts, rheostats, variable resistors, and
fixed resistors shall be in accordance with MIL-DTL-15109.
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