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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
4.6.22 Resistance to solvents (see 3.25). RCCB's shall be tested in accordance with method 215 of MIL-STD-202.
The following details and exceptions shall apply:
a.
Portion to be brushed; All marking areas.
b.
Solvent solutions: The solvent solutions used in this test shall be in accordance with table Xl.
TABLE Xl. Resistance to solvents.
Solvent
Test fluid
Solvent
Test fluid
1
7
Solvent (a) specified in method 215 of
2
3
8
Solvent (c) specified in method 215 of
4
SAE-AMS1424 (or ethylene glycol)
5
MIL-PRF-87937 (diluted for cleaning)
9
6
10
4.6.23 Operation. Power shall be applied to the RCCB and operated by the I/CU as specified below. The main
contact shall be continuously monitored for operation as specified in 3.26.
Applicable to ac-dc RCCB's:
a.
Apply 115 volts, 400 Hz to single pole and 200 volts line to line 400 Hz, 3 phase grounded neutral to three
pole RCCB line terminals and 28 V dc to back-up terminals, then manually close and open the I/CU.
b.
Remove line power then manually close and open the I/CU.
c.
Reapply line power and remove back-up power, then manually close and open the I/CU.
d.
Single pole RCCB's only: Apply 28 V dc to line terminal and 115 volts, 400 Hz to back-up terminal, then
manually close and open the I/CU.
e.
Three pole RCCB's only: Disconnect back-up power and connect 115 volts, 400 Hz to one phase then
manually close and open the I/CU.
f.
Remove all power, then manually close the I/CU.
g.
Reapply all power.
Applicable to ac RCCB's:
Perform test as specified in a. through g. above, except use the same voltage and phase for both line and
back-up power.
4.6.24 Trip-free calibration (see 3.27). With the I/CU terminal connected directly to the ground, the RCCB shall be
subjected to the maximum limit of ultimate trip calibration test. The ground shall remain connected for a minimum of
10 minutes after tripping of the RCCB occurs.
4.6.25 High temperature cycling (see 3.28). (Group A inspection only, see table VI). The RCCB shall be
maintained at 71°C ±5°C for 1 hour. The RCCB shall then be closed and opened fifty times via the I/CU at a rate of 3
±.5 seconds. Mechanical closing and opening of the RCCB shall be monitored via the main contacts.
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