MIL-PRF-39019F
3.15 Terminal strength. When circuit breakers are tested as specified in 4.8.12, there shall be no short circuiting,
breakage, loosening, or rotation of terminals, and no damage to the circuit breaker body or seal.
3.16 Vibration, high frequency. When circuit breakers are tested as specified in 4.8.13, 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 4.8.14, 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, and 25 percent for current ratings of 5.0 amperes and greater (see 3.1).
The insulation resistance shall be a minimum of 1 megohm (wet) at the end of the tenth cycle and a minimum of 100
megohms at the end of the 24 hour drying period, and there shall be no evidence of mechanical damage. Circuit
breakers shall also meet the following requirements.
a.
Dielectric withstanding voltage (see 3.6).
b.
Calibration (see 3.9).
c.
Seal (see 3.11).
d.
Panel seal (see 3.12).
3.18 Thermal shock. When circuit breakers are tested as specified in 4.8.15, there shall be no evidence of
mechanical damage.
3.19 Shock (specified pulse). When circuit breakers are tested as specified in 4.8.16, 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.
3.20 Trip-free calibration. When circuit breakers are tested as specified in 4.8.17, 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 lever is held in the closed position.
3.21 Salt atmosphere (corrosion). When circuit breakers are tested as specified in 4.8.18, there shall be no
evidence of excessive corrosion (see 3.3.1). Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance, or, in the case of plated metals, corrosion which has passed through the plating
and attacked the base metal. There shall be no warping, cracking, or other damage to the circuit breaker. After the
test, the mounting hardware shall be readily removable. Circuit breakers shall also meet the following requirements.
Dielectric withstanding voltage (see 3.6).
a.
b.
Calibration (see 3.9).
Seal (see 3.11).
c.
d.
Panel seal (see 3.12).
3.22 Barometric pressure (reduced). When circuit breakers are tested as specified in 4.8.19, the leakage current
shall not exceed 0.1 milliampere and there shall be no evidence of flashover, mechanical damage, arcing, or
breakdown.
3.23 Temperature rise. When circuit breakers are tested as specified in 4.8.20, they shall not trip. The
temperature rise of the terminals shall not exceed 25°C for 10.0 ampere breakers and below and 35°C for breakers
over 10.0 amperes.
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