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MIL-T-27/187C
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 +20C.
(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: -54C to +170C.
Operating temperature: +170C maximum.
Insulating materials:
Magnet wire insulation: Modified polyester base, polyamide-imide overcoat, +200C.
Encapsulated material: Epoxy, +170C.
Paper: Aramid, +220C.
3

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