Part #: 501-1712-04

Model: PS-855D

L3Harris - Power Supply,5.0 AMP,Short Circuit Prot.
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  • 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


- 70600-01822-104 Power Supply
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.