MIL-PRF-27/337E
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 rms, 400 ±20 hertz.
Secondary voltage and current (3-6): See table I.
Voltampere: See table I.
Working voltage (1-2): 535 volts peak.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Epoxy fiberglass or diallyl phthalate.
Terminals: Turret type.
Height: .300 inch, maximum.
Weight: 2 pounds, maximum (PIN's -01 through -10) and 2.2 pounds, maximum (PIN's -11
through -19).
Operating temperature range: -55°C to +130°C.
Altitude: 70,000 feet.
Terminal strength: MIL-STD-202, method 211, test condition A, 2 pounds.
Dielectric withstanding voltage (each winding, secondary windings connected in series):
At sea level: 1500 volts rms.
At reduced barometric pressure: 1.25 times the peak working voltage specified.
Electrical characteristics:
Rated load: With 115 volts rms and 400 Hz in (1-2), and rated current in secondary, the voltage
across (3-6) shall be as specified in table I, 5 percent.
Efficiency: 90 percent minimum at rated load.
Temperature rise: 45°C with 115 volts rms, 400 hertz across (1-2) at an ambient temperature of
85°C, full load terminals (3-6), for PIN's -01 through -10.
Temperature rise: 45°C with 115 volts rms, 400 hertz across (1-2) at an ambient temperature of
70°C, full load terminals (3-6), for PIN's -11 through -19.
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