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Part #: 501-1712-02

Model: PS-855B






Power Supply, 5.0 AMP, 5 VDC Output

Part Number :
L3Harris Logo



  • 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


Serial # 81135
Condition OH
Mods 1-10
Tag Date 08/17/22
Shop Southeast Aerospace Inc.
Warranty 6 Months
- Power Supply, 5.0 AMP, 5 VDC Output

NSN: 6130-01-482-8530

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

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

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.