MIL-DTL-2212K(SH)
3.13.1 External cable connections. When the number of external control circuit conductors entering a
controller is 12 or less, direct connection may be to the internal connection points except for door-mounted
components. Connections to door-mounted components should be by way of a terminal board that is not mounted
on the door. When more than 12 external control circuit conductors are required, connections shall be made to
terminal boards located within the enclosure near the cable entrance. External power circuit conductors may be
wired directly to the internal connection points. Terminal boards and direct connection points shall be accessible
from the front of the enclosure. Circuitous routing of conductors shall be avoided.
3.14 Mounting. Parts mounted on panels shall be replaceable without removing the panel.
3.15 Endurance. Endurance requirements for contactors, switches, relays (except relays conforming to
MIL-R-19523), and overload relays shall consist of the electrical and mechanical operations, as shown in table I.
Endurance requirements for contactors, switches, relays, and overload relays shall consist of the electrical and
mechanical operations as shown in table I except control relays (see 6.8.14) qualified under MIL-R-19523 shall need
no additional endurance testing. A device will have failed the endurance test if at any point during the test specified
in 4.6.2, the device fails (see 6.8.32) to function mechanically or electrically (failure to make, carry, or break the
load), there is welding of contacts, or at the conclusion thereof, the device fails to operate as required to pass the
examination and general operation test specified in 4.5.
TABLE I. Endurance requirements.
Percent of rated current
At percent
Power-factor
No. of operations 1/
Item
rated voltage
(lagging)
Make
Break
Contactors (AC):
Size 0 through 5
50,000
600
100
100
1
Size 6
25,000
600
100
100
1
Size 7
12,500
600
100
100
1
Size 0 through 6
50
600
600
110
0.4 to 0.5
Size 7
25
600
600
110
0.4 to 0.5
Size 0 through 4
1,000,000
Mechanical operations
Size 5 and 6
300,000
Mechanical operations
Size 7
100,000
Mechanical operations
Contactors (DC):
Size 0 through 6
25,000
400
100
100
Size 0 through 6
50
400
400
110
Relays
AC same requirements as for Size 0 AC contactors
DC same requirements as for Size 0 DC contactors
Switches
50,000
100
100
100
50
150
150
100
50,000
Mechanical operations
Overload relays
500
100
100
100
1
NOTE:
1/
One operation means one electrical make and break for each set of contacts.
7
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