MIL-PRF-27/334D
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.
Volt-ampere rating: 25 volt-amperes.
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.
Terminal height: .170 inch, maximum.
Weight: .52 pound, maximum.
Operating temperature range. -55°C to +130°C.
Altitude: 70,000 feet.
Terminal strength: Method 211, MIL-STD-202, test condition A, 2.0 pounds.
Dielectric withstanding voltage (each winding, secondary windings connected in series):
At sea level: 1,500 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: 35°C with 115 volts rms, 400 hertz across (1-2) at an ambient temperature of
95°C, full load terminals (3-6).
Voltage (no load ) - Voltage (rated load )
Regulation:
x 100
Voltage (rated load )
Shall not exceed 10 percent.
2
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