MIL-PRF-27/59D
REQUIREMENTS: (When numbers in parentheses i.e. (1-2) are used, they indicate the winding and the extreme
terminals of the winding.)
Electrical ratings: See table I.
Primary voltage (1-2): 115 volts ±10 percent, 400 Hz ±5 percent.
Design and construction:
Dimensions and configuration: See figure 1.
Weight: 18.7 ounces, maximum.
Duty cycle: Continuous.
Case: Metal enclosed (configuration A) or epoxy fiberglass enclosed (Configuration B).
Material: Steel (Configuration A) or epoxy fiberglass (Configuration B).
Altitude: 70,000 feet, maximum.
Operating temperature range: -55°C to +130°C maximum.
Terminals: Feed thru.
Terminal height: .390 inch (9.91 mm), maximum.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 5 pounds.
Dielectric withstanding voltage:
At sea level: 2.8 times the maximum working voltage specified in table I.
At reduced barometric pressure: 1.25 times the maximum working voltage specified in table I.
Electrical characteristics:
No load: With 115 volts, 400 Hz across (1-2): Current in (1-2) shall not exceed 75 mA rms.
Rated load: With 115 volts, 400 Hz across (1-2) and a resistive load with current as specified in table I in (3-5),
the voltage across (3-5) shall be as specified in table I.
Efficiency: 93 percent minimum at rated load.
Polarity: Additive with terminals 2 and 3 connected.
Voltage (no load ) - Voltage (rated load )
x
100
Regulation:
Voltage (rated load )
Shall not exceed 2.5 percent.
Phase shift: 1.0 electrical degree between primary and secondary voltage at rated load, maximum.
Temperature rise: 43°C, maximum with 115 volts, 400 Hz across (1-2) at ambient temperature of 87°C.
Vibration: MIL-STD-202, method 204, test condition D.
Marking location: See figure 1.
3
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