MIL-PRF-83383E
4.6.11 Vibration (see 3.14). RCCB's shall be tested in accordance with method 204 of MIL-STD-202. The
following details and exceptions shall apply:
a.
Mounting: Normal mounting means.
Temperature: Each test shall be repeated three times, once at 25°C ±5°C, and at the applicable high and
b.
low operating temperatures (see 3.1).
c.
Electrical load conditions: One of the RCCB's shall be tested in the open position. The remainder of the
RCCB's shall be tested in the closed position carrying no current and then with all poles carrying rated
current (90 percent rated current at high temperature) during and 30 minutes prior to testing.
d.
Test condition: C.
e.
Measurements during vibration: When testing with contacts carrying current, monitor for trip indication
only. When testing without rated current, RCCB's shall be monitored as specified in test condition A, test
circuit B, method 310 of MIL-STD-202 or similar to determine opening of closed main contacts (and
auxiliary contacts, as applicable) and closing of open main contacts (and auxiliary contacts, as applicable).
The following exceptions shall apply:
1. The open circuit voltage is 28 Vdc maximum.
2. The applied current is a maximum of 10% of the rated current.
f.
Inspection after vibration: RCCB's shall be inspected for evidence of mechanical and electrical damage
and shall be subjected to the 200 percent overload calibration test (triple pole RCCB's shall be subjected
to 200 percent overload on all three poles simultaneously at 25°C) (see 4.6.4).
4.6.11.1 Vibration scan for group B inspection (see 3.14.1). Vibration testing shall consist of two scans of the
vibration levels specified for method 204 of MIL-STD-202, test condition C. Both scans shall be performed at 25°C.
The scans shall consist of:
a.
The RCCB closed and carrying rated current to check for trip.
The RCCB open to check for contact closures in excess of 10 X 10-6 seconds.
b.
Each time the test is run, the RCCB shall be mounted in a different axis from the previous test.
4.6.11.2 Vibration scan for group C inspection (see 3.14.1). Vibration testing shall consist of two scans of the
vibration levels specified for method 204 of MIL-STD-202, test condition C. The scans shall consist of:
The RCCB closed and carrying rated current (90 percent of rated current at +71°C only) to check for trip.
a.
The RCCB open to check for contact closures in excess of 10 X 10-6 seconds.
b.
The RCCB shall be vibrated in this manner in each of the three mutually perpendicular axes. Each time group C
inspection is run, a different ambient temperature shall be used (i.e., -54°C the first time, +25°C the second time, and
+71°C the third, then repeat cycle).
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