MIL-DTL-17587C(SH)
TABLE XIV. Instantaneous timing test (electromechanical and electronic trip units) /1.
Left pole
Center pole
Right pole
Instantaneous
Applied
pickup setting
current
Trip time
Trip time
Trip time
/2
(amps)
Reqd /3
Actl
Reqd /3
Actl
Reqd /3
Actl
3 times
Min.
nominal
instantaneous
Setting
pickup
3 times
Intmd.
nominal
instantaneous
setting
pickup
NOTES:
/1 Short-time delay band and short-time delay pickup (STDPU) settings shall be set to maximum.
/2 Minimum and intermediate (or as close to middle as possible) instantaneous setting available on the circuit
breaker, as specified in the applicable specification sheet.
/3 Circuit breakers shall trip without intentional delay and shall trip in less time than the fastest published time of
the lowest short-time delay band setting as specified in the applicable specification sheet.
4.5.7.4 Abbreviated calibration.
4.5.7.4.1 Long-time delay. LTD calibration shall be tested in accordance with 4.5.7.1 and Tables VII, VIII, and
IX as applicable but at the intermediate LTDPU setting only.
4.5.7.4.2 Short-time delay. STD calibration shall be tested in accordance with 4.5.7.2 and Tables X, XI, and
XII but at the intermediate STDPU setting only.
4.5.7.4.3 Instantaneous. Instantaneous calibration shall be tested in accordance with 4.5.7.3 and Tables XIII
and XIV but at the intermediate instantaneous pickup setting only.
4.5.8 Inclined operation. Circuit breakers, attachments, and cradles shall be subjected to an inclined operation
test with the circuit breaker inclined forward, backward, and to each side, at an angle of 30 degrees from the normal
vertical/horizontal orientation. In each direction of inclination, the circuit breaker shall be tested in the connect, test,
disconnect, and withdrawn positions and shall meet the criteria specified in this section.
4.5.8.1 Connect position.
4.5.8.1.1 Abbreviated calibration (electromechanical trip units only). Circuit breakers with electromechanical
trip units shall be tested in accordance with 4.5.7.4.
4.5.8.1.2 Attachment operational checks.
4.5.8.1.2.1 Undervoltage lockout device operation.
4.5.8.1.2.1.1 Energized. The undervoltage lockout device shall be energized for test numbers 8A(2)(a) through
8A(2)(f) of Table V. It shall be verified that the undervoltage lockout device does not affect the circuit breaker
operation and does not trip a closed circuit breaker.
4.5.8.1.2.1.2 De-energized. The undervoltage lockout device shall be de-energized for test number 8A(2)(g) of
Table V. It shall be verified that the undervoltage lockout device prohibits closing of an open circuit breaker.
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