MIL-DTL-2212K(SH)
3.16.6.2.1 Designations. Designations shall be assigned as specified (see 6.2) and listed in the format below for
temperature switches:
Cut In
Conn.
Temp.
Bulb
Sensing
Bulb
Prefix
-
-
Circuit
-
Range
-
-
-
Voltage
-
-
-
Dimension
-
&
Tube
Switch
Type
Element
Size
Diff.
Length
Range
M2212
-
A
-
A
-
1
-
A
-
A
-
1
-
3
-
S
-
A
-
1
3.16.6.2.1.1 Bulb type. The temperature switch bulb type shall be designated by the single letter symbol as
follows:
A - Cross ambient (warmer or colder than ambient)
B - Colder than ambient
C - Warmer than ambient
3.16.6.2.1.2 Circuit. The temperature switch circuit shall be designated by the single letter symbol as follows:
A - S.P.S.T. - single pole, single throw
B - S.P.D.T. - single pole, double throw
C - D.P.S.T. - double pole, single throw (2 NO or 2 NC)
C' - D.P.S.T. - double pole, single throw (1 NO and 1 NC)
D - D.P.D.T. - double pole, double throw (2 NO and 2 NC and 2 common terminals)
D' - D.P.D.T. - double pole, double throw (4 NC and 2 common terminals)
D'' - D.P.D.T. - double pole, double throw (4 NO and 2 common terminals)
3.16.6.2.1.3 Ranges. Each standard temperature switch range and its maximum temperature shall be specified
by the designator in table IV.
3.16.6.2.1.4 Cut in and differential. The temperature switch cut in and differential shall be designated by the
single letter symbol as follows:
A - High close
B - High wide
C - Low close
D - Low wide
3.16.6.2.1.5 Sensing element. The temperature switch sensing element shall be one of the following
components depending on the type of operation of the switch:
A - Remote (capillary tube)
B - Direct
C - Direct back angle for horizontal mounting
3.16.6.2.1.6 Voltage. The temperature switch voltage shall be designated by the single number symbol as
follows:
1 - 440 VAC
2 - 115 VAC
3 - 230 VDC
4 - 115 VDC
3.16.6.2.1.7 Connection tube length. The temperature switch connection tube length shall be multiples of
5 feet.
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