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Part #: 501-1712-03

Model: PS-855C






Power Supply,2.5 AMP,Short Circuit Prot.

Part Number :
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  • Emergency Power Supply Unit
  • Provides emergency power to self-contained attitude gyros and other emergency equipment in the event of total aircraft power failure
  • Automatic operation upon 28 VDC essential bus failure
  • Automatically maintains full charge from normal flight operations (rechargeable to 50% capacity within one hour at 25°C)
  • Temperature compensated battery capacity test
  • Capacity test performed under load
  • Test performed remotely from the cockpit or at the unit
  • Automatic battery heaters with redundant control for safety
  • Heaters inhibited during low input voltage to prevent battery discharge
  • Internal load removed automatically after 5-second capacity test
  • Battery short circuit protected
  • Use of low maintenance lead acid batteries
  • Integral HIRF and lighting protection
  • Variable 5 VDC output
  • 5 V converter input undervoltage shutdown
  • 5 V converter input overvoltage shutdown
  • 5 V output short circuit protection (PS-855C & PS-855D only)
  • Environmental Qualifications:
    • PS-855A: DO-160C, Categories: [A2F2]-BB(CN)E1XXXXSABABAWA[XXC3]XX
    • PS-855B: DO-160C, Categories: [A2F2]-BB(C)E1XXXXSABABAWA[XXC3]XX
    • PS-855C & D: DO-160C, Categories: [A2F2-BB(CN)E1XXXXSABABAYA[XXC3]XX


Dimensions: 7.820"H x 14.085"L x 2.400"W Weight: 9.1 lbs. max (A, C, D) 13.7 lbs. max (B)
Input Power: 28 VDC 15 Amps. Battery Output Voltage: 24 to 28 VDC
5 VDC Converter: Adjustable +2.5 to 5.5 VDC, capable of delivering 25 watts Battery Output Current: Steady State Load: 10 Amp. max (A & B) 5 Amp. max (C & D) Overload Capability: 15 Amps for 5 minutes (A & B) Overload Protection: 25 Amp. max (A & B) 7.5 Amp. max (C & D)
Heater Voltage/Current: 28 VDC 3.85 ± 0.6 Amps. max Amps/Hour: 2.5 Amp/Hour (A, C, & D) 5.0 Amp/Hour (B)
TSO: Applicable sections of C4C Service Life: Unrestricted Service Life
Part Number Power supply Description:
501-1712-01 PS-855A
501-1712-02 PS-855B
501-1712-03 PS-855C
501-1712-04 PS-855D


- Power Supply,2.5 AMP,Short Circuit Prot.

NSN: 6130-01-506-2360

Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

According to L3 Service Letter SL-170 (Rev. K), the condition of the batteries is required to be checked every 3 to 6 months according to the Periodic Check procedure outlined in the bulletin. The Periodic Check procedure is similar to the "Preflight Check" that is recommended before aircraft flight.