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

FIGURE 9. Suggested test jig for panel-seal test.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order

(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel

need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are

maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or

within the military service's system commands. Packaging data retrieval is available from the managing Military

Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible

packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. Circuit breakers covered by specification sheet 1 through sheet 12 and sheet 20 through sheet

22 are intended primarily for use in the protection of electronic circuits, and should be used where moderate but

unprolonged starting overloads may be expected and where the optional speed of response provided can be

matched to the characteristics of the equipment to be protected. These circuit breakers are military unique in that

they must operate satisfactorily under the following demanding conditions: Endurance testing of 10,000

mechanically performed make and break operations, 6,000 of them while energized to 100% of rated

current, and they must meet stringent salt atmosphere (corrosion) testing. These circuit breakers should not be

used in circuits, such as primary power circuits of electric systems, whose rupture current potential is greater than the

interrupting capacity of the breaker, unless the circuit is properly protected by other means. Circuit breakers covered

by specification sheet 13 through sheet 19 are physically larger than the other breakers covered by this specification;

however, they offer higher current ratings and interrupt capacities, and may be used in primary power circuits

providing their interrupting capacity is not exceeded. Many of the specification sheets now include high-inrush

features that provide tolerance for short duration of high inrush or transient currents without decreasing steady-state

protection.