MIL-PRF-19207G
4.6.4 Dielectric withstanding voltage. Fuseholders shall be tested in accordance with method 301 of
MIL-STD-202 (see 3.5.4). The following details shall apply.
a. Mounting - Fuseholders shall be mounted in the specified mounting holes on an uninsulated
metal panel of the maximum specified thickness and with all specified mounting hardware and
gaskets.
c.
Test voltage - The test voltage shall be alternating (60 hertz (Hz)) and shall be twice the
fuseholder voltage rating plus 1,000 V.
d. Points of application - Test voltage shall be applied between all mutually insulated parts, current-
carrying parts, and exposed or grounded parts including mounting panel.
e. Measurements and examination - Current flow between points of voltage application shall be
measured. After the test, fuseholders shall be examined for evidence of arcing, flashover,
breakdown of insulation, or other damage.
4.6.5 Dielectric withstanding voltage (reduced barometric pressure) (see 3.5.5). Fuseholders shall be
tested in accordance with method 105 of MIL-STD-202. The following details and exceptions shall apply:
a. Test condition letter - C
b. Test voltage - The test voltage shall be as specified (see 3.1).
c.
4.6.6 Insulation resistance (see 3.5.6). Fuseholders shall be tested in accordance with method 302 of
MIL-STD-202. The following details shall apply:
a. Test condition letter - A.
b. Points of measurement - Between mutually insulated parts.
c.
Caps of indicating fuseholders shall be removed and only the fuseholder bodies tested.
4.6.7 Contact resistance (see 3.5.7). The contact resistance between the fuseholder terminals with an
appropriate copper dummy fuse shall be measured in accordance with method 307 of MIL-STD-202. The
following details shall apply:
a. Test current - 1 ampere.
b. Maximum open circuit test voltage - 3 V direct current (dc)
c.
Fuseholders with axial, contact pressure springs in the caps shall be fitted with a copper dummy
fuse having maximum ferrule diameter and minimum overall length. The fuse shall be inserted
into the cap so as to fully depress the spring. Insertion force shall be released gradually, allowing
the fuse to reposition in the cap by spring force only. The cap, with fuse, shall then be assembled
to the fuseholder body.
4.6.8 Overload. With an appropriate copper dummy fuse, the fuseholder shall be subjected to a
current equal to 150 percent of the maximum fuse rating which the fuseholder accommodates. The test
current shall be applied continuously for a period of 1 hour. All sections of multisection fuseholders shall
be tested simultaneously (see 3.5.8).
4.6.9 Endurance. With an appropriate copper dummy fuse in the fuseholder cap, the fuseholder cap
shall be inserted in the fuseholder and then removed for a total of 100 operations. Operation is defined
as insertion and withdrawal of the dummy fuse and cap within the fuseholder body, locking in place,
unlocking, and withdrawal of the dummy fuse and fuseholder cap. The fuseholder shall not be energized
during this test. Only one section of a multisection fuseholder shall be tested (see 3.5.9).
14
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business