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

3.12 Endurance. When tested as specified in 4.6.9, the RCCB shall not fail and shall show no evidence of

mechanical damage or loosening of parts.

3.12.1 Electrical operation. In addition, the RCCB shall calibrate within the limits of 90 percent of the specified

minimum ultimate trip current and 110 percent of the specified maximum ultimate trip current (see 3.7) and shall meet

the voltage drop requirement (see 3.8).

3.13 Terminal strength. When tested as specified in 4.6.10, the RCCB shall show no evidence of short-circuiting,

breakage, loosening, bending, stripping of threads, or rotation of terminals, as applicable, and no damage to the

circuit breaker body around the terminals.

3.14 Vibration. When tested as specified in 4.6.11, the RCCB main contacts shall not trip and there shall be no

opening of the closed nor closing of the open main or auxiliary contacts in excess of 10 microseconds, nor shall there

be any evidence of mechanical or electrical damage. The RCCB shall also meet the 200 percent overload calibration

requirement (see 3.7).

3.14.1 Vibration scan. When tested as specified in 4.6.11.1 or 4.6.11.2, the RCCB main contacts shall not trip, and

there shall be no opening of the closed nor closing of the open main or auxiliary contacts in excess of 10

microseconds, nor shall there be any evidence of mechanical or electrical damage. The RCCB shall also meet the

200 percent overload calibration requirements when tested at 25�C, mounted in the y-axis upon completion of the

scan.

3.15 Moisture resistance. When tested as specified in 4.6.12, the RCCB shall show no evidence of breaking,

cracking, spalling, excessive corrosion, or loosening of terminals. The RCCB shall also meet the following

requirements when tested at 25�C:

a. 1000 percent overload calibration. The RCCB must trip within �20 percent of the specified limits

b. 400 percent trip-free calibration. The RCCB must trip within �20 percent of the specified limits

(see 3.7) and meet the trip free requirement (see 3.27).

c. 200 percent overload calibration. The RCCB must trip within �10 percent of the specified limits

d. Dielectric withstanding voltage (see 3.5).

3.16 Thermal shock. When tested as specified in 4.6.13, the RCCB shall show no evidence of mechanical

damage.

3.17 Shock (specified pulse). When tested as specified in 4.6.14, the RCCB main contacts shall not trip. There

shall be no closing of the open main or auxiliary contacts, nor opening of the closed main or auxiliary contacts in

excess of 10 microseconds, nor shall there be any evidence of mechanical or

electrical damage. The RCCB shall also meet the 200 percent overload calibration requirements (see 3.7).

3.18 Coordination. When tested as specified in 4.6.15, the RCCB with the higher rating shall not open, the RCCB

with the lower rating shall open, and there shall be no electrical or mechanical malfunction.

3.19 Electromagnetic interference. When tested as specified in 4.6.16, the RCCB shall meet the requirements for

Aircraft, Army, Navy, and Air Force of MIL-STD-461.

3.20 Transient susceptibility. When tested as specified in 4.6.17, the RCCB shall not electrically or mechanically

malfunction.

3.21 Explosion. When tested as specified in 4.6.18, the RCCB shall not ignite the explosive mixture outside the

RCCB.