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MIL-PRF-83383 Circuit Breakers, Remote Control, Thermal, Trip Free General Specification ForThis specification covers the general requirements and test procedures for single and triple pole, trip-free, thermal, remote control circuit breakers for use in electric systems conforming to MIL-STD-704. These remote control circuit breakers are capable of being remotely set or tripped and provide indication of the main contact position by use of a 0.5 ampere, push-pull, trip-free circuit breaker \(not covered by this specification\). These remote control circuit breakers include auxiliary contacts \(see 6.5.4\) and terminals for control/monitor circuits. Hereinafter, a remote control circuit breaker is referred to as an RCCB \(see 6.9\).

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MIL-PRF-83383E
4.6.12 Moisture resistance (see 3.15). RCCB's shall be tested in accordance with method 106 of
MIL-STD-202. The following details and exceptions shall apply:
a.
Initial measurement: Not applicable.
b.
Electrical load conditions: RCCB's shall be closed with no power applied.
c.
Step 7b: Vibration is not required.
d.
Final measurements: On removal from the chamber, the RCCB may be manually shaken or swabbed to
remove external surface water and then permitted to stabilize at room temperature for 45 minutes.
RCCB's shall be subjected to the following series of tests:
(1) 1000 percent overload calibration at 25°C (see 4.6.4).
(2) Stabilize for 1 hour at room temperature.
(3) Trip-free calibration at 25°C (see 4.6.24) except use 400 percent overload.
(4) Stabilize for 2 hours at room temperature.
(5) 200 percent overload calibration at 25°C (see 4.6.4).
(6) Stabilize for 4 hours at room temperature.
(7) Dielectric withstanding voltage (see 4.6.2).
4.6.13 Thermal shock (see 3.16). RCCB's shall be tested in accordance with method 107 of
MIL-STD-202. The following details and exceptions shall apply:
Test condition: A-1 (except that cycling shall be continuous and the high temperature shall be 71°C ±5°C).
a.
b.
Inspection after cycling: RCCB's shall be inspected for evidence of mechanical damage.
4.6.14 Shock (specified pulse) (see 3.17). RCCB's shall be tested in accordance with method 213 of MIL-STD-
202. The following details shall apply:
a.
Mounting method: Normal mounting means.
b.
Test condition: J (except peak value shall be 25 g's).
c.
Electrical load conditions: The RCCB shall be subjected to three separate shocks in each of two
directions in each of the three principle axes for each of the following conditions:
(1) With the RCCB in the closed position and carrying rated current for 30 minutes prior to and during the
test.
(2) With the RCCB in the closed position with no load.
(3) With the RCCB in the open position.
d.
Measurements during shock: When testing with contacts carrying rated current, monitor for false trip only.
When testing without 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).
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