MIL-PRF-55629/21G
Part or Identifying Number (PIN): The PIN to be cataloged and stocked by the Government consists of the prefix
M55629/21 and four succeeding code letters as follows: 1/, 2/
For pole identification, see figure 1
Pole 1
Pole 2
M55629/21
E
K
E
M
Two pole circuit breaker with panel seal,
and auxiliary contacts.
Current rating code, see table I. 3/ {
Voltage, frequency, and time delay {
curve code, see tables I and II. 3/
When circuit breakers without auxiliary contacts, are installed in new equipment, replacement spares should possess
this feature since it is more economical for the DoD to stock one version of this item instead of two. Therefore, stock
numbers should not be requested (or assigned) for this special PIN.
______________
1/ Special PINs for equipment manufacturers' use only. Equipment manufacturers who do not require the
high-inrush feature or auxiliary contacts in specific production applications may order circuit breakers without
these features by modifying the prefix as follows: M55629/21XXXX. Replace slash with A for items without
auxiliary contacts (M55629A21XXXX). Replace slash with B for items without the high-inrush feature
(M55629B21XXXX). Replace slash with C for items without either high-inrush feature or auxiliary contacts
(M55629C21XXXX).
2/ Replace slash with D for items requiring configuration 2 (M55629D21XXXX). Replace slash with E for items
requiring configuration 2 without auxiliary contacts (M55629E21XXXX). Replace slash with F for items requiring
configuration 2 without the high-inrush feature (M55629F21XXXX). Replace slash with G for items requiring
configuration 2 without the high-inrush feature or auxiliary contacts (M55629G21XXXX).
3/ If both poles have identical ratings, code letters will repeat for each pole. If both poles are not identical, poles 1
and 2, respectively (see figure 1) shall be coded in ascending order of the current rating code letter. If both poles
have identical current ratings but different voltage, frequency, and time delay code letters, then these code letters
shall be coded in ascending order.
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