scope:

This specification covers the requirements and test procedures for single and multipole, trip-free, unsealed, magnetic circuit-breakers with current ratings of 0.2 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 6.5.1) for monitoring circuits. A voltage sensitive pole is also available in a four pole device. Panel seal mounts are available in 0.2 through 50 amperes. CAUTION: Calibration of these circuit breakers will be affected if mounted in other than the vertical plane.

The following military part numbering system shall be used to preclude changing existing catalog data.

The military part number identifying individual circuit breaker consists of the letter "M", the basic number of the specification sheet and a sequentially assigned dash number as follows:

NOTE: Nondelay poles are not available with the "high-inrush" feature but may be mixed with other delays having that feature. The military part number identifying the individual circuit breaker consists of the letter "M", the basic number of the specification sheet followed by the pole ratings (see 3.1) as follows: Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Electronics Research and Development Command, ATTN: DELET-RS, Fort Monmouth, NJ 07703 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

intended Use: