MIL-PRF-27/25C
REQUIREMENTS:
Electrical ratings:
Primary voltage 1, 2, 3, and 12 neutral, 115 volts rms line neutral, 3 phase, 400 Hz ±20 Hz.
Secondary voltage:
(4-5) (5-6) (6-4): 42 volts rms, 0.9 amperes, line to line, wye connected.
(7-8) (8-9) (9-7): 42 volts rms, 0.9 amperes, line to line, wye connected.
Working voltage: 175 volts maximum.
Design, configuration, and physical dimensions: See figure 1.
Duty cycle: Continuous.
Case:
Material: Metal, hermetically sealed.
Terminals: Twelve solderable turret type capable of accepting a minimum of two number 18 AWG wires.
Height: .312 inch maximum.
Weight: 3 pounds maximum.
Dielectric withstanding voltage (at sea level): Method 301 of MIL-STD-202; test voltage 500 volts rms.
Electrical characteristics:
No load: With 115 volts, 400 Hz ±20 Hz across terminals (12-1), (12-2), (12-3). Current 0.1 ampere
maximum per phase; voltage across (4-5), (5-6), (6-4), (7-8), (8-9), (9-7) shall be 42 volts rms ±1
percent, respectively.
Rated load: With 115 volts, 400 Hz across (1-12), (2-12), (3-12), voltage across (4-5), (5-6), (6-4), (7-8),
(8-9), (9-7) shall be 42 volts rms +1 percent, -3 percent at 0.9 amperes per secondary leg.
Regulation: The output voltage of secondary windings (4-5), (5-6), (6-4), (7-8), (8-9), (9-7) shall not vary more
than ±3 percent with load reduced from 0.90 amperes to 0.10 amperes.
Electrostatic shielding: Electrically and mechanically connected to terminal 10.
Temperature rise: Not more than 65°C when operated at 0.90 amperes per secondary leg.
Ambient temperature: -28°C to +65°C.
Quality assurance provisions:
Retention of qualification: Not applicable for this specification sheet.
Quality conformance inspection: Groups A and B tests of MIL-PRF-27 shall be applicable.
Marking location: See figure 1.
Part or Identifying Number (PIN): M27/25-1.
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