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

3.22 Sand and dust. When tested as specified in 4.6.19, the RCCB shall meet the 400 percent trip-free calibration

requirement. The RCCB shall also trip within �20 percent of the specified limits for 200 percent overload calibration

3.23 Salt atmosphere (corrosion). When tested as specified in 4.6.20, the RCCB shall show no evidence of

excessive corrosion, warping, cracking, or other damage. The RCCB shall also trip within �20 percent of the

specified limits for 200 percent overload calibration (see 3.7).

3.24 Interrupting capacity. When tested as specified in 4.6.21, the RCCB shall trip automatically and provide

indication by tripping the I/CU. The RCCB shall be resettable within 10 minutes after each test. The RCCB shall

also meet the following requirements:

a. Dielectric withstanding voltage (see 3.5).

b. 200 percent overload calibration. The RCCB must trip within �20 percent of the specified limits

3.25 Resistance to solvents. When RCCB's are tested as specified in 4.6.22, the marking shall remain legible.

3.26 Operation. When tested as specified in 4.6.23, the following conditions shall result for each corresponding

subparagraph.

a. Paragraphs a through e: RCCB main contacts shall close when the I/CU is closed and open when

the I/CU is opened.

b. Paragraph f: RCCB main contacts shall remain open.

c. Paragraph g: RCCB main contacts shall close.

3.27 Trip-free calibration. When tested as specified in 4.6.24, the RCCB shall open, but not reclose in on the

overload current or be capable of resetting until the ground is removed and reconnected.

3.28 High temperature cycling. When the RCCB is cycled as specified in 4.6.25, the main contacts shall close and

remain closed, and open and remain open when the I/CU is closed and opened.

3.29 Marking (see 3.1).

3.29.1 Identification marking. The following information shall be marked on the RCCB in accordance with method I

a. Part number (see 3.1).

b. Current rating, voltage, and operating frequency (see 3.1).

c. Contractor's name, trademark, or code and date code.

d. Circuit schematic (see 3.1).

3.29.2 Other marking. The "on" position of integral actuators (see 3.4.4.1); the line and load terminals; the terminal

identification on the TJS; the pole identification, when specified (see 3.1); the position indication; and when specified

(see 3.1), "ac only" shall be clearly and permanently marked on each RCCB, as specified (see 3.1).

3.30 Recycled, recovered, or environmentally preferable material. Recycled, recovered, or environmentally

preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the

operational and maintenance requirements, and promotes economically advantageous life cycle costs.

3.31 Workmanship. RCCB's shall be processed in such a manner as to be uniform in quality and shall be free

from cracked or displaced parts, sharp edges, burrs and other defects that will affect life or serviceability.