MIL-PRF-55629E
3.14 Terminal strength. When circuit breakers are tested as specified in 4.8.10, there shall be no short-circuiting,
breakage, loosening, bending, stripping of threads, or rotation of terminals, as applicable, and no damage to the
circuit breaker body around the terminals.
3.15 Mounting strength. When circuit breakers are tested as specified in 4.8.11, there shall be no breakage,
malfunction, or evidence of any damage which would impair the ability of the breakers to meet the requirements of
subsequent tests.
3.16 Vibration. When circuit breakers are tested as specified in 4.8.12, main circuit breaker contacts shall not trip.
There shall be no closing of open main or auxiliary contacts, nor opening of closed main or auxiliary contacts in
excess of 10 microseconds duration, nor shall there be any evidence of mechanical or electrical damage.
3.17 Moisture resistance. When circuit breakers are tested as specified in 4.8.13, the change in resistance or
impedance between the initial and final recorded measurements shall not exceed 10 percent for circuit breaker
current ratings of less than 5.0 amperes; 25 percent for current ratings of 5.0 through 25.0 amperes; 30 percent for
current ratings over 25.0 through 50.0 amperes; and shall not deviate more than 50 percent for circuit breakers over
50 amperes through 100 amperes. The insulation resistance shall be a minimum of 1 megohm (wet) at the end of the
th
10 cycle and a minimum of 100 megohms at the end of the 24-hour drying period and there shall be no evidence of
breaking, cracking, spalling, or loosening of terminals. Circuit breakers shall also meet the following requirements:
a.
Dielectric withstanding voltage (see 3.7).
b.
Calibration (see 3.9).
3.18 Thermal shock. When circuit breakers are tested as specified in 4.8.14, there shall be no evidence of
mechanical damage.
3.19 Shock. When circuit breakers are tested as specified in 4.8.15, main circuit breaker contacts shall not trip.
There shall be no closing of open main or auxiliary contacts, nor opening of closed main or auxiliary contacts, nor
shall there be any evidence of mechanical or electrical damage.
3.20 Trip-free calibration. When circuit breakers are tested as specified in 4.8.16, tripping times shall be as
specified in 3.9. After the circuit breaker has tripped, the contacts shall not automatically return to the closed position
even momentarily. Subsequent performance of the circuit breaker shall not be adversely affected. The auxiliary
contacts shall indicate the main contact condition even when the actuator is held in the closed position (see 3.5.8.2).
3.21 Salt atmosphere (corrosion). When circuit breakers are tested as specified in 4.8.17, there shall be no
evidence of excessive corrosion (see 3.4.1). Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance. There shall be no warping, cracking, or other damage to the circuit breaker.
After the test, the hardware, if applicable (see 3.5.6), shall be readily removable.
3.22 Temperature rise. When circuit breakers are tested as specified in 4.8.18, they shall not trip and the
temperature rise of the terminals shall not exceed 25ºC for 10.0 ampere circuit breakers and below, 35ºC for circuit
breakers over 10.0 amperes through 25.0 amperes, and 50ºC for circuit breakers over 25.0 amperes through 100
amperes (55ºC for circuit breakers over 50 amperes through 100 amperes tested at 400 Hz).
3.23 Interrupting capacity. When circuit breakers are tested as specified in 4.8.19, circuit breakers shall trip
automatically; there shall be no dielectric breakdown, and when applicable (see 3.1 and 3.5.8.2), the auxiliary
contacts shall operate, indicating position of the main contacts. Circuit breakers shall also meet the following
requirements:
a.
Dielectric withstanding voltage (see 3.7).
b.
Trip at 200 percent of rated current (see 3.9).
c.
Resistance or impedance (see 3.10).
3.24 Panel seal. When circuit breakers are tested as specified in 4.8.20, there shall be no visible air bubbles
indicative of leakage.
3.25 Marking (see 3.1).
3.25.1 Identification marking. The following information shall be marked on the circuit breaker in accordance with
MIL-STD-1285. The resistance to solvents test does not apply.
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