MIL-PRF-27/19D
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): 58 voltamperes, 115 volts rms, 60 Hz.
Secondary voltage (3-5): 52 volts rms CT, 1.0 ampere rms.
Working voltage: (1-2) 357 volts rms maximum.
(3 -5) 357 volts rms maximum.
Design, configuration, and physical dimensions: See figure 1.
Duty cycle: Continuous.
Case: Encapsulated.
Material: Epoxy.
Terminals: Solder type.
Height: .38 inch maximum.
Weight: 3.5 pounds maximum.
Operating temperature: -55°C to +130°C
Altitude: 10,000 feet, maximum.
Terminal strength: Method 211 of MIL-STD-202, test condition A, 2 pounds.
Dielectric withstanding voltage (each winding) at sea level: Method 301 of MIL-STD-202; test voltage 1,000 volts
rms.
Electrical characteristics:
No load: With 115 V rms and 60 Hz across (1-2), current in (1-2) shall not exceed 200 milliamperes, and the
power in (1-2) shall not exceed 4.5 watts. Voltage across (3-5) shall be 55..5 volts rms ±2 percent.
Rated load: With 115 volts rms and 60 Hz across (1-2), and the rated current in secondary, voltage across
(3-5) shall be 52 volts rms ±3 percent.
DC resistance:
(1-2): 9.89 ohms maximum.
(3-5): 1.43 ohms maximum.
Efficiency: 90 percent at rated load.
Regulation: Voltage (no load) Voltage (rated load)
X 100
Voltage (rated load
Shall not exceed 12 percent
Polarity - Additive, with terminals 2 and 3 connected.
Electrostatic shielding: The voltage ratio shall me a minimum of 5 to 1 at 20 kHz.
Temperature rise: 40°C with 115 volts rms, 60 Hz across (1-2) at an ambient temperature of 90°C, full load terminals
(3-5).
Marking location: See figure 1.
3
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