MIL-C-55629/18C
REQUIREMENTS
Dimensions and configuration: See figure 1.
Current ratings: See table I.
Voltage ratings: See table II.
Tripping-time delays: See table II.
Terminal and mounting hardware: See figure 1.
Terminals: See figure 1.
Actuator strength: 40 pounds.
Actuator operating force: 12 pounds, maximum.
Shock:
a. MIL-STD-202, method 213, test condition I.
b. 60 G's for 21 ms.
Interrupting capacities: 5,000 amperes at 125 V dc and 240 V ac, 60 Hz and 400 Hz in accordance
with the applicable requirements of UL489. Interrupt test is not performed at 400 Hz..
High inrush. Applicable to time delay characteristics K, L, N, P, R, and S.
Vibration: Energized current shall be 80 percent of rated current and the frequency range shall be 10
to 55 Hz.
VERIFICATION:
Qualification inspection: Not applicable.
Conformance inspection: Group A tests of MIL-PRF-55629.
Part or Identifying Number (PIN): The military PIN consists of the prefix M55629/18 and six code
letters selected from tables I and II as shown in the following example.
For pole identification, see figure 1
Pole 2
Pole 3
Pole 1
M55629/18
A
K
A
N
A
R
Three pole circuit breaker
without auxiliary contacts._________________
Current rating code, see table I. 1/ {_______________________________________
Voltage, frequency, and time delay
curve code, see tables I and II. 1/ {____________________________________________
On-off marking shall be visible with the trim or cover in place.
__________
1/ Poles 1, 2, and 3, respectively, shall be coded in ascending order of current rating code letter. If
two or more poles have identical current ratings, those poles shall be coded in ascending order of
voltage, frequency, and time delay code letter.
3