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MIL-DTL-2212 Contactors And Controllers, Electric Motor Ac Or Dc, And Associated Switching DevicesThis specification covers alternating current \(AC\) and direct current \(DC\) motor controllers, contactors \(see 6.8.6\), and associated switching devices \(see 6.8.3\). Included are magnetic controllers, controller parts \(see 6.8.52\), limit switches \(see 6.8.90\), pressure switches \(see 6.8.92\), temperature switches \(see 6.8.95\), selector switches \(see 6.8.94\), push-buttons \(see 6.8.57\), and similar devices used for control of electric motors \(see 6.8.19\). Semiconductor \(solid-state\) devices used as parts for magnetic controllers are included.

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MIL-DTL-2212K(SH)
3.16.6.2.1.8 Bulb size. The temperature switch bulb size shall be designated by the single letter symbol as
follows:
A - (3/8 inch by 3 inches)
B - (11/16 inch by 35/8 inches)
C - (11/16 inch by 8¼ inches)
D - (11/16 inch by 12 inches)
E - (11/8 inches by 6½ inches)
F - (11/8 inches by 14½ inches)
G - (11/8 inches by 30 inches)
H - (11/16 inch by 3 inches)
I - (11/16 inch by 43/8 inches)
N - Special (specified size other than a standard size)
3.16.6.2.1.9 Dimensions. The temperature switch dimensions shall be designated by a single letter symbol as
follows:
A - For temperature switch:
Mounting hole separation distance: 213/32 inches with the space between left-side mounting hole and the
housing edge as 13/16+1/8 inch and the space between the left-side mounting hole and the lower mounting hole
is 39/32 inches vertically and 21/32 inch horizontally, hole to hole tolerance is ±1/32 inch.
Switch box housing (maximum): 35/16 inches (height) by 5¼ inches (width) by 53/16 inches (depth).
Direct sensor housing (maximum): 2½ inches.
Remote sensor housing (maximum): 5 inches.
B - Special (other than the standard dimensions)
TABLE IV. Range for temperature switches.
Maximum
Maximum
Operating
allowable
proof
Optimum
temperature
Designator
temperature 1/
variation from
differential
range (°F)
(°F)
setting (°F)
4/
2/, 3/, 5/
1
-20 to 0
-
4/
2/, 3/, 5/
2
0 to 50
-
4/
2/, 3/, 5/
3
30 to 90
120
4/
2/, 3/, 5/
4
90 to 150
190
4/
2/, 3/, 5/
5
140 to 200
240
4/
2/, 3/, 5/
6
190 to 240
270
4/
2/, 3/, 5/
7
230 to 280
310
4/
2/, 3/, 5/
8
260 to 320
350
4/
2/, 3/, 5/
9
290 to 360
380
4/
2/, 3/, 5/
10
300 to 400
430
16



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