MIL-PRF-55629E
4.8.10 Terminal strength (see 3.14). Circuit breakers shall be tested in accordance with method 211 of
MIL-STD-202. The following details and exceptions shall apply:
a.
Other than screw-type terminals - Test condition A.
(1) Applied force - As specified (see 3.1). Two pounds for auxiliary terminals.
(2) Direction of applied force - Perpendicular to the mounting plate or mounting surface.
b.
Screw-type terminals only - Test condition E. Applied torque - See table V to each terminal.
c.
Examinations after test - To verify compliance with 3.14.
TABLE V. Terminal strength.
Screw size
Full (lbs)
Torque (lbs-in)
8
25
15
10
30
22
1/4
30
35
5/16
70
80
4.8.11 Mounting strength (see 3.15). The axial load specified in table VI shall be applied to the mounting means
for a period of 1 minute, using hardened steel screws. The torque specified in table VI shall then be applied to the
screw head about the thread axis for 1 minute without damage to the mounting means. For single hole mounted
circuit breakers, this test shall be conducted with the mounting nut assembled on the threaded bushing of the
breaker. The torque for bushing-mounted circuit breakers shall be 25 pound-inches.
TABLE VI. Mounting strength.
Screw size
Axial loads (lbs)
Torque (lbs-in)
6
30
10
8
35
20
4.8.12 Vibration (see 3.16). Circuit breakers shall be tested in accordance with method 204 of MIL-STD-202. The
following details and exception shall apply:
a.
Tests and measurements prior to vibration - Not applicable.
b.
Test condition - A.
c.
Mounting method - Normal mounting means.
d.
Electrical-load conditions - Half of the circuit breakers shall be tested with the main contacts closed, while
energized at 100 percent rated current dc (see 3.1). The other half of the circuit breakers shall be tested
with the main contacts open and unenergized.
e.
Measurements during vibration - Each circuit breaker shall be monitored to determine opening or closing of
contacts in the "on" and "off" position.
f.
Examination after vibration - Circuit breakers shall be examined for evidence of mechanical and electrical
damage.
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