MIL-DTL-17361G(SH)
3.5.5 Special tools. Circuit breakers and current limiting fuse units shall be so designed that special tools shall
not be required for removal of assemblies from the front of switchboards. A special tool shall be provided for
manual operation of an electrically operated circuit breaker from the front of the switchboard. Special tools are
defined as those tools not listed in the GSA Global Supply Catalog.
3.5.6 Dimensions (standardized). Outline and mounting dimensions for each type circuit breaker, mounting
block, mounting bases/blocks or current limiting fuse unit shall be as specified (see 3.1). Tolerances for outline and
mounting dimensions shall be within ±1/32 inch (nonaccumulating) below 24 inches and 1/8 inch for dimensions
greater than 24 inches.
3.5.7 Position. Circuit breakers shall be designed for mounting in any position. When mounted vertically, the
"on" position (designated by a handle or pushbutton) shall be up.
3.5.8 Current carrying connections. Current carrying connections shall be electrodeposited Type 1, Grade A,
B, or C silver coatings as specified in ASTM B700 in areas of current-carrying contact with lugs, terminals, bus ties,
and screw bolts. Silver plating shall be in accordance with ASTM B700, with the exception that the silver plate
thickness shall be 0.0002 inch or greater.
3.5.9 Arc chamber. Arc chambers shall be constructed to limit the exhaust from the circuit breaker. The circuit
breaker design must have ample clearance dimensions to accommodate the exhaust to prevent external damage.
3.5.10 Transformers. Transformers shall meet the minimum requirements of Type CC specified in MIL-T-
16315.
3.5.11 Thermoplastic parts. Unless otherwise specified (see 6.2), selected parts (circuit breaker housing
excluded) may be made from thermoplastic material.
3.5.12 Painting. Parts not having a corrosion resistant treatment or not fabricated of corrosion resisting
material of the types specified in MIL-E-917 shall be painted in accordance with MIL-E-917, except that only one
coat of gray enamel shall be applied. Touching up is permitted for marks or scratches due to assembly, testing, or
other factory handling.
3.5.13 Operating handle. The operating handle of each circuit breaker shall have a suitably sized hole to allow
attachment of a warning tag or a locking device. For stored energy circuit breakers employing other operating
means, mechanical or electrical lock off provision shall be provided.
3.5.14 Insulation.
3.5.14.1 Material.
3.5.14.1.1 Circuit breaker and fuse unit housing. Circuit breakers and current limiting fuse units (see 6.4.6)
shall be supported and enclosed in a housing which is molded of an insulating material in accordance with ASTM
D5948, Types MAT30, MAI60, MAI30, or MMI30. Venting shall not be permitted through openings in the back of
the housing or through the front of the housing cover.
3.5.14.1.2 Mounting base/block. See 3.5.18.1 for requirements.
3.5.14.2 Dielectric strength.
3.5.14.2.1 Application points on circuit breaker mounting base/block terminals and ground. Voltage
magnitudes of Table I are based on ratings of circuit breaker mounting base/block terminals being used as
application points when insulation is in as-new condition. Application points are defined in 4.5.4.3.1.1. Insulation
shall be able to withstand without breakdown a sinusoidal wave of at least 60 Hz frequency at the applicable voltage
magnitude when applied between required application points. As circuit breakers are cycled and tested for
qualification, dielectric strength requirements at 60 percent of the Table I values may apply. See 4.5.4 and Tables V
and VI for these test requirements.
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