MIL-PRF-27/318C
REQUIREMENTS: (When numbers in parentheses, i.e., (1-2) are used, they indicate the winding and
the extreme terminals of the winding.)
Electrical ratings:
Primary voltage (1-2): 115 volts ac, 50 to 60 hertz.
Primary dc resistance: 3.7 ohms 25 percent.
Secondary voltage (3-5): See table I.
Volt-ampere rating: 80 volt-amperes.
Working voltage (1-2): 535 volts peak.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle. Continuous.
Case: Metal enclosed.
Material: Steel.
Terminals: Solderable terminals.
Dash numbers
Terminal type
Height (inches)
Diameter (inches)
01 and 02
Hook
0.473 ±.031
0.080 ±.005
03 through 30
Hook
0.375 ±.031
0.062 ±.005
Weight: 5.0 pounds, maximum.
Operating temperature range. -55 to +130C.
Altitude: 10,000 feet.
Terminal strength: Method 211, MIL-STD-202, test condition A, 2.0 pounds.
Dielectric withstanding voltage (each winding) (at sea level): 1,500 volts rms.
Electrical characteristics:
Rated load: With 115 volts ac and 60 Hz across (1-2), and rated current in secondary, the voltage
across (3-5) shall be as specified in table I.
Voltage (no load ) Voltage (rated load )
Regulation:
x 100
Voltage (rated load )
Shall not exceed 10 percent.
Polarity: Additive with terminals 2 and 3 connected.
Temperature rise: 35C with 115 volts ac, 60 hertz across (1-2) at an ambient temperature of 95C,
full load terminals (3-5).
3
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