MIL-PRF-27/331C
Weight: 10.5 pounds, maximum.
Operating temperature range. -55C to +130C.
Altitude: 10,000 feet.
Terminal strength: Method 211, MIL-STD-202, test condition A, 2.0 pounds.
Dielectric withstanding voltage (each winding, secondary winding shall be connected in parallel):
At sea level: 1,500 volts rms.
Electrical characteristics:
Rated load: With 115 volts rms and 60 Hz in (1-2), and rated current in secondary, secondary voltage shall
be as specified in table I within ±3 percent.
Regulation: Voltage (no load ) Voltage (rated load )
x 100
Voltage (rated load )
Shall not exceed 10 percent.
Polarity: Additive, with terminals 2 and 3 connected and 5 and 4 connected.
Temperature rise: 40C with 115 volts rms, 60 hertz across (1-2) at an ambient temperature of 90C.
Shock (specified pulse): MIL-STD-202, method 213, test condition G.
Marking location: See figure 1.
Part or Identification Number (PIN): M27/331-(dash number from table I).
TABLE I. Electrical ratings.
Secondary
Secondary
Secondary
Secondary
Secondary
dc resistance
current
voltage
current (series)
voltage
Dash
each winding
(parallel)
(parallel)
amperes
(series)
number
ohms ±25%
amperes
volts rms
(3-6)
volts rms
(3-5)
(3-5)
(3-6)
0.0163
20.00
8.0
10.00
16.0
-01
0.0256
17.00
10.0
8.50
20.0
-02
0.039
14.16
12.0
7.08
24.0
-03
0.088
10.00
17.0
5.00
34.0
-04
0.13
8.50
20.0
4.25
40.0
-05
0.196
6.06
28.0
3.03
56.0
-06
0.53
3.86
44.0
1.93
88.0
-07
0.92
2.82
60.0
1.41
120.0
-08
3
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