MIL-PRF-55629E
4.8.3 Dielectric withstanding voltage (see 3.7). Circuit breakers shall be tested in accordance with method 301 of
MIL-STD-202. The following details shall apply:
a.
Magnitude of test voltage - 1,000 volts (rms) plus twice the rated voltage of the circuit breaker, for points of
application C 1, 2, and 3; 600 volts (rms), for points of application C 4 and 5. Duration of application shall
be 1 minute for qualification and group B tests; 5 seconds for group A tests.
Optional method - Use 2000 volts on units rated 250 volts and below and 2700 volts on units rated
250 volts and above for points of application C1, 2 and 3 for 1 second. Use 1000 volts for points
of application C3 and 4 for 1 second.
Tolerance for test voltage above shall be +10%,-0%.
b.
Nature of potential: AC.
c.
Points of application of test voltage:
(1) Between all main circuit breaker terminals tied together and ground (any exposed metal part except
terminals, or if none, a metal mounting panel with the circuit breaker mounted thereon), with the circuit
breaker main contacts in closed and open position.
(2) Between all auxiliary contact terminals tied together and main circuit breaker terminals tied together with
circuit breaker main contacts in closed and open positions.
(3) Between poles of multipole breakers with the line terminal of each pole tied to the corresponding load
terminal of that pole, with circuit breaker main contacts in closed and open positions.
(4) Between all auxiliary contact terminals tied together and ground (any exposed metal part except
terminals, or if none, a metal mounting panel with the circuit breaker main contacts in closed and open
positions).
(5) Between each open pair of auxiliary contact terminals, with circuit breaker main contacts in closed and
open position.
d.
Measurement during test: The circuit shall be continuously monitored during application of the test voltage
to determine if the leakage current exceeds 0.5mA.
e.
Examinations after test: Circuit breakers shall be examined for evidence of flashover, mechanical damage,
arcing, and breakdown.
4.8.4 Insulation resistance (see 3.8). Circuit breakers shall be tested in accordance with method 302 of,
MIL-STD-202. The following details shall apply:
a.
Test condition: B.
b.
Point of measurement:
(1) Between all main circuit breaker terminals tied together or individually and ground (any exposed metal
part except terminals, or if none, a metal mounting panel with the circuit breaker mounted thereon), with
the circuit breaker main contacts in closed and open positions.
(2) Between all auxiliary contact terminals tied together or individually and main circuit breaker terminals
tied together or individually with circuit breaker main contacts in closed and open positions.
(3) Between poles of multipole breakers with the line terminal of each pole tied to the corresponding load
terminal of that pole or tested individually with circuit breaker main contacts in closed and open
positions.
(4) Between all auxiliary contact terminals tied together or individually and ground (any exposed metal part
except terminals, or if none, a metal mounting panel with the circuit breaker mounted thereon), with the
circuit breaker main contacts in closed and open positions.
(5) Between each open pair of auxiliary contact terminals, with circuit breaker main contacts in closed and
open positions.
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