MIL-DTL-17361G(SH)
3.5.14.2.2 Application points on attachment leads, circuit breaker mounting base/block terminals, and ground.
When attachment leads are used as application points, insulation shall be able to withstand without breakdown a
sinusoidal wave of at least 60 Hz frequency at 900 volts. Application points are defined in 4.5.4.3.1.2. As circuit
breakers are cycled and tested for qualification, dielectric strength requirements at 540 volts may apply. See 4.5.4
and Tables V and VI for these test requirements.
TABLE I Dielectric strength voltage magnitude.
Circuit voltage of
Rms value of dielectric
equipment
test voltage
Less than 60
500
60120
900
Over 120 and less than 240
1200
240480
1500
Above 480
Twice rated voltage plus 1000
3.5.14.3 Insulation resistance. With insulation in as-new condition, insulation resistance shall be greater than
10 megohms between all the measuring points of 4.5.5.2. As circuit breakers and attachments are cycled and tested
for qualification, insulation resistance values greater than 1 megohm may apply. See 4.5.5 and Tables V and VI for
these test requirements.
3.5.14.4 Temperature rise. Temperature rise shall not exceed the temperature requirements of molding and
insulating materials specified in MIL-E-917 in as-new condition. As circuit breakers and attachments are cycled and
tested for qualification, temperature rise limits may vary. See 4.5.12 and Table V for these test requirements.
3.5.15 Operating mechanism/closing and opening.
3.5.15.1 Mechanism. The circuit breaker operating mechanism shall be such that the main and arcing contacts
shall be quick-make (see 6.4.21) and quick-break (see 6.4.20) under all conditions of manual and automatic
operation. They shall be capable of manual operation to the "on" and "off" positions, these positions being
prominently marked in such a manner as to be easily and definitely identified. Automatic tripping of non-stored
energy circuit breakers shall be clearly indicated by the handle with the trip position at approximately the middle
point. Automatic tripping of stored energy circuit breakers without operational handles shall be indicated by other
means.
3.5.15.2 Simultaneous operation. Poles of a multiple pole circuit breaker shall open and close simultaneously.
3.5.15.3 Trip free. Circuit breakers shall be mechanically and electrically trip free (see 6.4.27) in any mounting
position under all conditions of operation.
3.5.15.4 Manual closing and opening. The following requirements shall be met:
a.
Circuit breakers shall open and close manually.
b. The operating handle, or other operating device, shall be of an insulating material and shall not have any
metal protruding beyond the circuit breaker cover.
c. Circuit breakers provided with an electric operating mechanism shall include a mechanical means for
manual opening or closing. It shall not be necessary to remove the circuit breaker cover or electric operating
mechanism to manually operate the circuit breaker.
3.5.16 Overcurrent protection tripping devices. The overcurrent protection devices shall be direct acting
thermal magnetic, electronic or a combination thereof and operate in an ambient temperature range of 0 to 50 °C.
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