MIL-PRF-27/187D
REQUIREMENTS: (When designations or colors in parentheses, i.e., (COM-HV) (BLK-WHT) are used,
they indicate the winding and the extreme terminals of the winding.)
Electrical ratings:
Primary (COM-HV): 173 volts ampere, 115 volts rms, 400 hertz.
Secondary (BLK-WHT): 12.5 volts rms, 11.2 amperes rms.
Working voltage:
(COM-HV): 179 volts maximum.
(BLK-WHT): 20 volts maximum.
DC resistance: At ambient temperature of +20�C.
(BLK-WHT): 0.057 ohm �15 percent.
(WHT-HV): 1.45 ohms �15 percent.
Design and construction:
Dimensions and configuration: See figure 1.
Duty cycle: Continuous.
Case: Diallyl phthalate (ASTM D 5948-96).
Weight: 0.820 pound maximum.
Terminal type:
Primary: Corrosion-resistant steel, threaded integral shoulder-stud.
Secondary: Number 18 AWG insulated lead wire in accordance with MIL-DTL-16878, type EE.
Terminal height:
Primary: See figure 1.
Terminal length:
Secondary: 16 �1 inch.
Altitude: 80,000 feet maximum.
Operating temperature range: -54�C to +170�C.
Operating temperature: +170�C maximum.
Insulating materials:
Magnet wire insulation: Modified polyester base, polyamide-imide overcoat, +200�C.
Encapsulating material: Epoxy, +170�C.
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