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MIL-PRF-55629 Circuit Breakers, Magnetic, Unsealed Or Panel Seal, Trip-Free, General Specification ForThis specification covers the requirements and test procedures for single and multipole, trip-free, unsealed, magnetic circuit breakers with current ratings of 0.2 amperes to 100 amperes inclusive, up to and including 240 volts, 400 Hertz, 480 volts, 60 Hertz alternating current \(ac\) and 125 volts direct current \(dc\), \(see 6.1\). These circuit breakers may also include auxiliary contacts \(see 6.6.1\) for monitoring circuits. A voltage sensitive pole is also available in a four pole device. Panel seal mounts are available in 0.2 amperes through 50 amperes. Designers are WARNED that these circuit breakers may contain a pure tin finish on some of the component parts \(see 6.5\).

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MIL-PRF-55629E
Circuit breaker
Wire size
Uninsulated terminal
Insulated terminal
capacity (amperes) 1/
(AN designation)
lug (MS part no.) 2/
lug (MS part no.) 2/
1 and below
20
2 to
6 inclusive
18
7 to
10 inclusive
16
11 to
15 inclusive
14
SAE-AS20659 3/
16 to
20 inclusive
12
21 to
25 inclusive
10
26 to
40 inclusive
8
41 to
55 inclusive
6
56 to
70 inclusive
4
71 to
80 inclusive
3
81 to  100 inclusive
2
1/ For circuit breakers between steps, use the AN wire of the next larger physical wire size.
2/ Test lead wires and terminals shall conform to SAE-AS50861 and SAE-AS7928, respectively.
3/ Use appropriate dash number for current rating and stud size.
FIGURE 1. Calibration-test circuit.
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