MIL-DTL-17587C(SH)
3.4.13.4 Anti-pump. In any position and under all conditions of operation, a repeated manual or electrical
closing (pumping action) of the circuit breaker during a short-circuit, overload condition, or other trip signal shall
not be permitted.
3.4.14 Electrical connections on rear of cradle for cable and bus bar. Cradles shall be provided with
connections on the backside to accommodate all cable and bus bar. Stud or lug terminals shall not turn in a manner
that will reduce electrical clearances.
3.4.15 Wiring. Remote control devices mounted on the circuit breaker shall be completely wired and
connected to the secondary disconnecting devices. Wires shall be bundled and secured to the maximum extent
possible, to prevent damage from vibration. Each wire more than 8 inches long and all wires combined in a bundle
shall be marked on each end in compliance with MIL-DTL-16036.
3.4.16 Overcurrent protection.
3.4.16.1 Overcurrent coils and overcurrent sensors. Overcurrent coils or overcurrent sensors (see 6.3.12 and
6.3.13) shall be provided for the circuit breakers as specified (see 6.2), with ratings and pickup settings as shown in
the applicable specification sheet.
3.4.16.2 Overcurrent protection tripping devices (calibration). Circuit breakers shall be provided with
overcurrent protection as specified (see 6.2). The overcurrent protection tripping devices shall be direct acting
electromechanical, electronic, or a combination thereof and operate in an ambient temperature range of 0 to 50 °C.
3.4.16.2.1 Electromechanical trip devices. Adjustable settings, other than for long-time delay devices, shall
be sealed against tampering with the setting.
3.4.16.2.1.1 Long-time delay trip element.
3.4.16.2.1.1.1 Long-time delay pickup settings. Available long-time delay pickup settings for each trip coil or
sensor rating shall be in accordance with the applicable specification sheet. The settings shall be adjustable and
clearly marked. Unless otherwise specified in the applicable specification sheets or noted in the qualification
package, a pickup setting shall be provided that equals 1.5 times the continuous current setting established by the
coil or sensor rating. The maximum error for any setting shall not exceed ±10 percent.
3.4.16.2.1.1.2 Long-time delay band settings. Available long-time delay band settings shall be in accordance
with the applicable specification sheet. The operating characteristics of each band setting shall be in accordance
with the applicable specification sheet. The characteristics shall apply for single-pole operation, for any two poles
in series and for three poles in series.
3.4.16.2.1.2 Short-time delay trip element. The short-time delay trip element shall be direct-acting.
3.4.16.2.1.2.1 Short-time delay pickup settings. Available short-time delay pickup current settings shall be in
accordance with the applicable specification sheet. The settings need not be readily adjustable but shall be set at
the place of manufacture as specified (see 6.2). The setting shall be indicated on the identification plate of the
short-time delay trip element. The maximum error for any setting shall not exceed ±10 percent.
3.4.16.2.1.2.2 Short-time delay band settings. Available short-time delay band settings shall be in accordance
with the applicable specification sheet. The settings need not be readily adjustable but shall be set at the place of
manufacture as specified (see 6.2). The setting shall be indicated on the identification plate of the short-time delay
trip element. The characteristics apply for single-pole operation, for any two poles in series, for three poles in
series, and for single-phase and three-phase operation. Values of operating time and resettable delay shall not fall
outside the predetermined short-time delay band.
3.4.16.2.1.3 Instantaneous trip element. The instantaneous trip element shall trip the circuit breaker with no
intentional time delay. Instantaneous pickup settings need not be readily adjustable, as specified (see 6.2), but shall
be set at the place of manufacture to any of the settings specified in the applicable specification sheet. The pickup
current value setting shall be accurate to within ±10 percent for settings up to 10 times the trip coil rating and ±20
percent for settings above 10 times the coil rating. The instantaneous trip feature may have a setting to turn it off.
The characteristics of instantaneous trip apply for single-phase and three-phase operation.
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