MIL-PRF-55629/20G
REQUIREMENTS
Dimensions and configuration: See figure 1 and figure 2.
Current ratings: See table I.
High inrush: Applies unless otherwise specified. 1/
Voltage ratings: See table II. Ratings are maximum; the minimum operating voltage is limited by the internal
resistance or impedance of the circuit breaker (see table I).
Auxiliary contacts:
Contact capacity shall be 10 amperes to 250 volts 60/400 Hz and 2 amperes resistive, 1 ampere inductive to
50 V dc.
Tripping-time delays: See table I and table II.
Terminal and mounting hardware: See figure 1.
Terminals: See figure 1. Solderability is applicable to auxiliary contact terminals.
Actuator strength: 25 pounds.
Actuator operating force: 4 pounds, maximum.
Terminal strength:
Applied load: 30 pounds.
Applied torque: 10 inch-pounds.
Interrupting capacities:
2,000 amperes at 50 V dc.
2,000 amperes at 120 V ac, 60 Hz.
1,500 amperes at 120 V ac, 400 Hz.
1,000 amperes at 240 V ac, 60 and 400 Hz.
Seal: Panel seal test applies.
Part or Identifying Number (PIN): The PIN to be cataloged and stocked by the Government consists of the prefix
M55629/20 and two succeeding code letters as follows: 1/, 2/
M55629/20
E
M
Single pole circuit breaker with
panel seal and auxiliary contacts.
Current rating code, see table I.
Voltage, frequency, and time delay
curve code, see tables I and II.
______
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: M55629/20XX: Replace slash with A for items without auxiliary contacts
(M55629A20XX). Replace slash with B for items without the high-inrush feature (M55629B20XX). Replace slash
with C for items without either the high-inrush feature or auxiliary contacts (M55629C20XX).
2/ Replace slash with D for items requiring configuration 2 (M55629D20XX). Replace slash with E for items requiring
configuration 2 without auxiliary contacts (M55629E20XX). Replace slash with F for items requiring configuration
2 without the high-inrush feature (M55629F20XX). Replace slash with G for items requiring configuration 2
without the high-inrush feature or auxiliary contacts (M55629G20XX).
5