MIL-DTL-17361G(SH)
3.4.3 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
(see 3.1) without failure, evidence of undue wear, or development of operating irregularities in any part. See
3.5.19.2 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 Tables V and VI).
3.4.4 Calibration. Unless otherwise specified herein, circuit breakers shall perform in accordance with the
applicable trip curves and/or overcurrent tables (long-time, short-time, instantaneous) in the specification sheets (see
3.1).
3.4.5 Inclination. Circuit breakers, fuse units, attachments, and mounting bases/blocks shall operate in
accordance with the requirements specified herein when permanently inclined in any direction to a 45-degree
maximum position from the normal vertical or horizontal positions.
3.4.6 Temperature rise. Circuit breakers, attachments, mounting bases/blocks, and insulation shall meet the
temperature rise requirements specified in 3.5.14.4, 3.5.18.4, and 3.5.19.1.
3.4.7 Interrupting 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 sheets (see 3.1). Circuit
breakers with fuse units shall be subjected to additional short-circuit sequences at the current magnitudes shown in
the applicable specification sheets (see 3.1).
3.4.8 Shock. Circuit breakers, fuse units, attachments, and mounting bases/blocks shall withstand electrically
and mechanically the high impact shock tests of MIL-S-901 for Grade A, Class I, Type C equipment.
3.4.9 Vibration. Circuit breakers, fuse units, attachments, and mounting bases/blocks shall withstand
electrically and mechanically the Type I vibration tests specified in MIL-STD-167-1.
3.4.10 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.
3.4.11 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, fuse units, and attachments including false tripping.
3.5 Design, construction, and additional performance requirements. See Tables V and VI for reference to
applicable verification paragraphs in Section 4.
3.5.1 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.
3.5.2 Safety. To ensure maximum personnel safety and to minimize equipment casualties, the safety
requirements of MIL-E-917 shall be adhered to during design and manufacture. Components shall be free of
mercury compounds, and materials shall be asbestos-free.
3.5.2.1 Polyvinyl chloride (PVC). PVC material shall not be used unless it is a part of or integral to the leads
of a component or as a constituent or integrated element of a component.
3.5.3 Type NQB circuit breakers. Type NQB circuit breakers (circuit disconnect switch) shall be furnished as
specified (see 3.1) and shall conform to the requirements specified for Type AQB circuit breakers, except they shall
have no automatic over-current protection.
3.5.4 Ambient temperature operating range. Circuit breakers, fuse units, and attachments shall operate in a
temperature range of 0 to 50 °C.
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