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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

TABLE I. Tripping times for calibration tests.

Ambient temperature �C

Calibration tests

Percent rated current

Tripping time

�5�C

Minimum ultimate trip 1/ 2/

115

+25

No trip 3/

Maximum ultimate trip 1/

138

1 hour max

200

Overload and trip-free

400

At -54, +25, and

(see 3.1)

1000

+71

Ambient effect on

115

-54

No trip 3/

calibration (ultimate trip

160

1 hour max

limits)

100

+71

No trip 3/

138

1 hour max

200

Within maximum and

Unbalanced overload 4/

400

+25

10% of minimum trip

1000

time limits (see 3.1)

See 6.5.5 and 6.5.6.

Temperature rise of the terminals shall not exceed 75�C during testing.

Test time shall be 1 hour, minimum.

Triple pole RCCB's only.

3.7 Calibration. When tested as specified in 4.6.4.1 (qualification or periodic inspection) or 4.6.4.2 (group A

inspection), the tripping time (see 6.5.1) shall be as specified (see 3.1 and table I). All poles of triple pole RCCB's

shall trip under all "must trip" conditions.

3.8 Voltage drop. The voltage drop across the auxiliary contact terminals shall not exceed .250 volt. When tested

as specified in 4.6.5, the voltage drop across the line and load terminals of the RCCB shall not exceed the following

limits per pole:

Initial measurement

After endurance

Rating (amperes)

.450

.50

7.5

.360

.40

.347

.385

15-100

.225

.250

3.9 Response time. When tested as specified in 4.6.6, the RCCB shall open within the specified time (see 3.1).

3.10 Power requirements and response time at minimum voltage. When tested as specified in 4.6.7a, b, and c,

respectively, the RCCB shall:

a. Minimum opening voltage: Open automatically.

b. Standby current drain and actuation current: Not to exceed 10 milliamperes ac and dc standby

current. The opening and closing current shall not exceed the value specified (see 3.1).

c. Maximum operating time at minimum voltage: Open or close the main contacts within a

maximum of 50 milliseconds after the corresponding opening or closing of the I/CU.

3.11 Overload cycling. When tested as specified in 4.6.8, the RCCB shall meet the 200 percent overload

calibration requirement (see 3.7) during cycling; after cycling, the RCCB shall meet the minimum and maximum

ultimate trip requirements (see 3.7).