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

4.6.9.2 DC loads. During the dc endurance tests, the voltage shall be 30 �2 volts.

a. Resistive load: Resistive operation shall be accomplished at rated load.

b. Inductive load: Inductive operation shall be accomplished at rated load. Inductive dc load shall

use iron core inductors as specified in 4.6.9.2.1 and 4.6.9.2.2. Inductors shall be used in parallel

as necessary to meet or exceed rated load.

c. Motor load: The RCCB shall make six times rated load and break rated load.

d. Lamp load: Lamp operation shall make 12 times rated load and break rated load.

4.6.9.2.1 Type I DC inductor (main CB circuit). Terminal to terminal resistance shall be 0.277 Ohms

�10%. When calibrated or tested at 28 �0.5 VDC, the current versus time curve obtained upon closing the inductor

circuit with a suitable switching device whose contact-bounce duration shall be less than

1 millisecond shall be within the limits shown in Figure 2 for 5.0 �0.5 amperes steady-state current and

within the limits shown in Figure 3 for 25.0 �0.5 amperes steady-state current.

4.6.9.2.2 Type II DC inductor (auxiliary switch circuit). Terminal to terminal resistance shall be 8.15 Ohms �10%.

When calibrated or tested at 28 �0.5 VDC, using 1 ampere steady-state current, the current shall reach 95 percent of

the steady-state point (3L/R) in 135 �5 milliseconds.

4.6.10 Terminal strength (see 3.13). RCCB's shall be tested in accordance with method 211 of

MIL-STD-202. The following details and exceptions shall apply:

a. Test conditions: A and E. The tensile load specified in table VIlI shall be applied to each terminal and to

the mounting nut in the X and Y axis (see figure 4) for a period of 1 minute; then the torque value specified

in table VlII shall be applied in a clockwise direction to the nut or screw

head about the thread axis for a period of 1 minute.

b. Inspection after test: Verify compliance with 3.13.