MIL-PRF-27/155C
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 rms, 50/60 Hz.
Voltamperes: 12.
Secondary voltage (3-5): 20 volts rms, center-tap.
Secondary current (3-5): 0.6 amperes.
Working voltage (peak): 535 volts.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Metal encased.
Terminals: Solder terminal, Lundey #399E or equivalent.
Terminal height: .469 inch ±.030 inch (11.91 ±0.76 mm).
Weight: 20.9880 ounce, maximum.
Operating temperature range: -55°C to +130°C.
Terminal strength: MIL-STD-202, method 211, test condition A, 5 pounds and test condition E,
8.0 ounce-inch.
Shock (specified pulse): MIL-STD-202, method 213, test condition H.
Dielectric withstanding voltage (at sea level): 1,500 volts rms.
Electrical characteristics:
No Load: With 115 volts, 60 Hz across (1-2), current in (1-2) shall not exceed 35 mA and the power
in (1-2) shall not exceed 0.8 watts.
Rated load: With 115 volts, 60 Hz across (1-2), the voltage across (3-5) shall be 20 volts ±5
percent.
DC resistance:
(1-2): 82 ohms, maximum.
(3-5): 3.44 ohms, maximum.
Polarity: Additive, with terminals 2 and 3 connected.
Temperature rise: 40°C with 115 volts rms, 60 Hz across (1-2) at an ambient temperature of 90°C.
Marking location: See figure 1.
2
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