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

3.3.6 Electronic components. Electronic components selected shall be such that the RCCB shall meet the

performance requirements and product characteristics specified herein. The manufacturer shall establish an

evaluation program in accordance with Appendix A.

3.4 Interface and physical dimensions. The RCCB shall be of the interface, weight, and physical dimensions

specified (see 3.1). All poles of triple pole RCCB's shall be mechanically ganged together.

3.4.1 Trip-free feature. The RCCB shall be such that the circuit cannot be maintained closed when any pole is

carrying overload currents that would normally automatically trip the circuit breaker to the open position.

3.4.2 Trip indication or warning label. The RCCB shall provide positive indication of the main contact position or a

warning label shall be furnished with the RCCB (see 3.1). Electrical actuation of the indicator is not acceptable.

3.4.2.1 Remote trip indication. The RCCB shall be such that when the circuit breaker contacts open automatically

on overload, the RCCB shall cause the remote actuator to indicate the operation by moving to the "open" tripped

position.

3.4.3 Attitude. The RCCB shall trip within maximum and minimum limits of the specified trip times (see 3.1, 6.5.1

and 6.5.2), when mounted in any of three mutually perpendicular axes (see 4.6.4).

3.4.4 Controls.

3.4.4.1 Indicator/control unit (I/CU). The RCCB shall be capable of remote actuation by means of an I/CU

connected between a control terminal of the RCCB and supply ground (see 3.1). A load control switch or subsystem

relay contact may be connected in series with the I/CU. The I/CU (not furnished under this specification) shall be a

0.5 ampere, trip-free circuit breaker, with trip times and internal impedance defined in the applicable specification

sheet.

3.4.5 Electrical connections. Connections to external circuits shall be as specified (see 3.1).

3.4.5.1 Line and load terminals (see 6.5.3). The main line and load terminals shall be as specified (see 3.1). Each

terminal shall be capable of carrying rated current and voltage per pole of the RCCB.

3.4.5.2 Control and auxiliary contact terminals (see 6.5.4). The control terminals and auxiliary contact terminals

shall meet the performance of a terminal junction system (TJS) in accordance with MIL-T-81714 to accept pin contact,

part number M39029/1-100 or -101 in accordance with MIL-C-39029/1. Auxiliary contacts shall be of a single pole,

double throw configuration. The auxiliary contacts shall be arranged in a manner to insure (regardless of actuator

position) that the normally open contacts are closed when the main contacts are closed.

3.4.6 Threaded parts. Screw threads shall be in accordance with FED-STD-H28 and as specified (see 3.1).

RCCB's shall be supplied with the specified hardware assembled in proper order.

3.4.7 Solder. Solder shall not be used primarily for obtaining mechanical strength. Electrical connections shall be

mechanically secure before and electrically continuous after soldering.

3.4.8 Voltage rating. The RCCB shall have a voltage rating per pole as specified (see 3.1).

3.4.9 Continuous current carrying capacity. The RCCB shall be capable of carrying the rated current as specified

3.5 Dielectric withstanding voltage. When tested as specified in 4.6.2, the RCCB shall show no

evidence of damage, arcing, or breakdown. The leakage current shall not exceed 0.5 milliamperes.

3.6 Insulation resistance. When tested as specified in 4.6.3, the RCCB shall have an insulation resistance of not

less than 100 megohms.