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Part #: 501-1712-04

Model: PS-855D






Power Supply,5.0 AMP,Short Circuit Prot.

Part Number :
L3Harris Logo



  • Emergency Power Supply Unit
  • Sikorsky Part Number 70600-01822-104
  • 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 under-voltage shutdown
  • 5 V converter input overvoltage shutdown
  • 5 V output short circuit protection
  • Chassis assembly contains:
    • Input circuit card assembly with integral main connector
    • Two replaceable lead-acid battery-packs with integral heaters
    • Circuit card assembly containing heater control and monitor circuitry
    • Test switch and test lamp
  • Will fit within the outline dimensions of an ART 1/4 short package and be rack mountable
Dimensions: 7.820"H x 14.085"L x 2.400"W Weight: 9.1 lbs. max
Input Power: 28 VDC 15 Amps. Max 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:  5 Amp. max  Overload Protection:  7.5 Amp. max w/internal circuit breaker 5 Vdc Converter Steady State Load: 5 Amp. max
Heater Voltage/Current: 28 VDC 3.85 ± 0.6 Amps. max Connector: J1: Cannon DPXB-13-34P-0107 or equivalent J2: mates with Cannon DPXB-13-33S-0007 or equivalent
environmental: DO-160C Notice 3, Categories: [A2F2]-BB(CN)E1XXXXSABABAYA[XXC3]XX TSO: Applicable sections of C4C
Nameplate: PS-855D is identified w/SAC nameplate (PN 535-1884-01) Service Life: Unrestricted service life
Maintenance: Periodic maintenance is required
Part Number Power supply Description:
501-1712-01 PS-855A
501-1712-02 PS-855B
501-1712-03 PS-855C, 5V output short circuit protection
501-1712-04 PS-855D, 5V output short circuit protection


Serial # 83156
Condition NEW
Mods -
Tag Date 05/25/21
Shop L3 Aviation Products Inc.
Warranty 1 Year
Serial # 83157
Condition NEW
Mods -
Tag Date 05/25/21
Shop L3 Aviation Products Inc.
Warranty 1 Year
- 70600-01822-104 Power Supply

NSN: 6130-01-558-4798

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.

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.