NPFC - MIL-PRF-23419
FUSE, CARTRIDGE, INSTRUMENT TYPE, GENERAL SPECIFICATION FOR
|Publication Date:||25 July 2017|
This specification covers the general requirements and test procedures for instrument type fuses designed for the protection of electrical, electronic, and communication equipment on direct current (dc) and alternating current (ac) (up to 400 hertz (Hz)) circuits.
Fuses. Fuses covered by this specification are intended for use in electronic and low power electrical equipment where relatively low values of short circuit currents are encountered. The... View More
Fuses. Fuses covered by this specification are intended for use in electronic and low power electrical equipment where relatively low values of short circuit currents are encountered. The fuse primarily provides protection and isolation for the equipment itself. These fuses are designed to endure environmental requirements not specified in MIL-PRF-15160. The fuses covered by this specification are unique due to the fact that these devices must be able to operate satisfactorily under the following demanding conditions: 10 g's vibration, 100 g's of shock, thermal shock from -65°C to +125°C and 48 hours of salt atmosphere. In addition, these requirements are verified under a qualification system. Commercial components are not designed to withstand these environmental conditions.
CAUTION. Application of fuses must be made within the short circuit current and voltage ratings shown on the applicable specification sheet. The available short circuit current of the system in which the fuse is applied will not exceed the short circuit current rating of the fuse. Use of fuses beyond these requirements may be dangerous to personnel and cause damage to the equipment.
SAFETY. Fuses covered by this specification may be safely applied in circuits having a lower voltage than shown as the maximum for the particular fuse provided the short circuit current rating of the fuse is not exceeded. Fuses should never be applied in circuits having voltages greater than the specified maximum fuse voltage rating.
WARNING. FM08 style cartridge fuses are susceptible to plasma arcing once the internal pressure falls near 50 torr or below. If used in a vacuum, the fuse will eventually leak down to critical pressure. If the fuse encounters over-limit currents with sufficient source current, a plasma arc can ensue that will consume the fuse and possibly damage the hardware. Therefore, it is recommended these style fuses not be used in vacuum applications with voltages greater than 36 volts.View Less