NPFC - MIL-F-23419
FUSE, CARTRIDGE, INSTRUMENT TYPE, GENERAL SPECIFICATION FOR
|Publication Date:||1 August 1992|
This specification covers 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. Statistical process control (SPC) techniques are required in the manufacturing process to minimize variation in production of fuses supplied to the requirements of this specification.
The type designation of fuses shall be in the following form, and as specified (see 3.1 and 6.2).
The style is identified by the letters "FM" followed by a two-digit number, denoting a fuse of a given construction and dimensions.
The characteristic is identified by a one-letter symbol which indicates the relative overload interrupt time (see 6.5) in accordance with table I. TABLE I. Characteristics.
Symbol Relative overload interrupt time
The voltage rating shall be the maximum direct current (dc) or alternating current (ac) root mean square (rms) voltage for which a fuse is designed (see 3.1). The voltage rating is identified by a numerical value followed by the letter "V".
The current rating is the amount of current a fuse will carry indefinitely without interruption (see 3.1). The current rating in amperes and fractions of an ampere is identified by a numerical value followed by the letter "A".
When specified, a suffix letter shall be added to the type designation covered by selected specification sheets to denote optional finish (see 3.1). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Defense Electronics Supply Center, ATTN: DESC-EMM, 1507 Wilmington Pike, Dayton, OH 45444-5283, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
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... View More
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-F-15160.
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 shall 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.
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.
Equipment designers should refer to MIL-STD-1360, "Fuses, Fuseholders and Associated Hardware, Selection and Use of", for a selection of fuse types preferred for use in new equipment design.
The preservation, packing, and marking specified herein are intended for direct shipments to the government. Unless otherwise designated, the minimum packaging provisions herein are also intended for the preparation of these fuses for shipment form the parts manufacturer to nongovernment activities.View Less