MIL-DTL-17587C(SH)
3.3 General design, construction, and performance requirements.
3.3.1 Drawout-mounted construction. Circuit breakers shall be of drawout-mounted construction, consisting of
a removable element (see 6.3.19) and a stationary element (see 6.3.21). The removable element shall be referred to
as "circuit breaker" for the remainder of this specification. The stationary element shall be referred to as the
"cradle" for the remainder of this specification. Circuit breakers and cradles shall provide accessibility for
maintenance purposes, adjustment of devices, and replacement of overcurrent protection devices.
3.3.2 Creepage and clearance distances. Unless otherwise specified in the specification sheets (see 3.1),
creepage and clearance distances shall be in accordance with MIL-E-917. Unless otherwise specified (see 6.2), set
C spacing and enclosed type of enclosure apply.
3.3.3 Insulation. Insulation shall meet the material, dielectric strength, insulation resistance, and temperature
rise requirements specified herein.
3.3.4 Endurance/manual cycling. Circuit breakers shall have the ability to be cycled continuously for the
number and rate of mechanical and electrical endurance operations as shown in the applicable specification sheets
without failure, evidence of undue wear, or development of operating irregularities in any part. See 3.4.17.2 for
attachment endurance requirements. Circuit breakers shall have the ability to be manually cycled at various times
during qualification testing as required by this specification (see Table V).
3.3.5 Calibration. Circuit breakers shall perform in accordance with the applicable trip curves and overcurrent
tables (long-time, short-time, instantaneous) in the specification sheets.
3.3.6 Inclination. Circuit breakers, attachments, and cradles shall operate in accordance with the requirements
specified herein when inclined in any direction to a 30-degree maximum position from the normal
vertical/horizontal orientation.
3.3.7 Temperature rise. Unless otherwise specified in the specification sheets, circuit breakers, attachments,
and insulation shall meet the temperature rise requirements specified in Table I.
3.3.8 Short-time current duty cycle performance (withstand rating). Circuit breakers shall perform short-time
current duty cycle in accordance with the current rating and time duration shown in the applicable specification
sheet.
3.3.9 Interrupting current duty cycle performance. Circuit breakers shall be able to interrupt an O-CO-CO
short-circuit sequence in accordance with the interruption current rating shown in the applicable specification sheet.
3.3.10 Shock. Circuit breakers, attachments, and cradles shall withstand electrically and mechanically the high
impact shock tests of MIL-S-901 for Grade A, Class I, Type C equipment.
3.3.11 Vibration. Circuit breakers, attachments, and cradles shall withstand electrically and mechanically the
Type I vibration tests specified in MIL-STD-167-1.
3.3.12 Electromagnetic interference (EMI). Circuit breakers with electronic trip units and communications
capability (if applicable) shall meet and demonstrate compliance with the applicable emissions and susceptibility
requirements and limits of MIL-STD-461 for surface ship, below deck, metallic hull installations. Requirements for
EMI test plans shall be as specified in the qualification package.
3.3.13 Voltage spike. Circuit breakers with electronic trip units and communications capability (if applicable)
shall withstand voltage spikes of 2500 volts peak in accordance with MIL-STD-1399-300. Voltage spikes shall not
cause failure of trip units (including false tripping) and attachments.
3.4 Additional design, construction, and performance requirements.
3.4.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
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