MIL-PRF-39019F
3.4.8 Terminals.
3.4.8.1 Line and load terminals. The main line and load terminals shall be mounted as specified (see 3.1). Load
terminals will be on the side of the keyway and line terminals will be on the side opposite of the keyway. Each
terminal shall be capable of carrying rated current and voltage per pole of the circuit breaker. The terminals shall be
hook style for configuration 1 and screw terminals for configuration 2.
3.4.8.2 Auxiliary contact terminals. When specified (see 3.1), circuit breakers shall be provided with auxiliary
contacts (see 6.6.1) of the single-pole, double-throw type and three auxiliary contact terminals, which, unless
otherwise specified (see 3.1), shall be capable of carrying 0.5 ampere tungsten lamp load at 50 volts dc or 120 volts
ac. There shall be one common terminal (designated by symbol "C"), one terminal to indicate auxiliary contacts
which are normally open (designated by symbol "NO") when the main circuit breaker contacts are open, and one
terminal to indicate auxiliary contacts which are normally closed (designated by symbol "NC") when the main circuit
breaker contacts are open, regardless of lever position. Terminal location, style, and design shall be as specified
(see 3.1).
3.4.8.3 Solderability of hook terminals. Hook terminals shall be treated to facilitate soldering. Coating such as hot
solder dip is acceptable.
3.4.9 Reset mechanism. The reset mechanism shall be so designed that retaining the actuator in the closed
position after automatic tripping occurs shall not adversely affect subsequent performance of the circuit breaker.
3.4.10 Tamper-proof calibration. Circuit breakers shall be so sealed that tampering with the calibration is not
possible without dismantling the device or breaking the seal.
3.4.11 Soldering. When soldering is employed, only noncorrosive fluxes shall be used. Solder shall not be used
primarily for obtaining mechanical strength. Electrical connections shall be mechanically secure before, and
electrically continuous after, soldering.
3.4.12 Welding and brazing. When welding or brazing is employed, the electrical connections shall be
mechanically secure and electrically continuous after welding or brazing. When brazing is employed, only
noncorrosive fluxes shall be used.
3.4.13 Voltage and frequency rating. Circuit breakers shall be designed to have identical load ratings at all
3.4.14 Continuous current carrying capacity. Circuit breakers shall be capable of continuously carrying the rated
current as specified (see 3.1).
3.4.15 Circuit diagram. The circuit diagram shall be as specified (see 3.1).
3.5 Solderability. When circuit breakers are tested as specified in 4.8.2, 95 percent of the total length of fillet,
which is between the standard wrap wire and the terminal, shall be tangent to the surface of the terminal being
tested. There shall be no pinholes, voids, etc. A ragged or interrupted line at the point of tangency between the fillet
and the terminal under test shall be considered a defect. After the test there shall be no evidence of fracture,
loosening of parts, or any other mechanical failure of the circuit breakers.
3.6 Dielectric withstanding voltage. When circuit breakers are tested as specified in 4.8.3, the leakage current
shall not exceed 0.5 milliampere and there shall be no evidence of flashover, mechanical damage, arcing, or
breakdown.
3.7 Insulation resistance. When circuit breakers are tested as specified in 4.8.4, the insulation resistance shall not
be less than 100 megohms.
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