GFS Power

Power Function Manager



The Power Function Manager (PFM-500) is a system integrating component which converts ordinary power supplies (or Power Modules) into a fully integrated and multi-functional power system. The unit provides for control, monitoring, paralleling and protection of 12, 24 or 48 VDC, positive negative or floating ground power sources. A 500 amp, heavy duty parallel tie point bus accommodates input from multiple/redundant rectifiers. A digital meter displays system bus voltage, battery voltage, total rectifier amperage, connect/disconnect voltage set points, and system ambient temperature. Features also include status lights, load distribution circuits, low voltage battery disconnect with alarm contacts. All these functions are combined in a compact, rack mount housing which serves as a master DC power management and distribution center. A rack mount ground/return bus is provided. The PFM may be used for integration, control, monitoring and protection of numerous different types of power sources, such as AC-DC rectifiers, regulated power supplies, DC-DC converters and battery banks.


Model Nominal Input/Output VDC Circuit Breaker Capacity
PFM-500 12, 24, or 48 pos. or neg. ground 5 (PBA Series)


  • Provides parallel tie point for DC power modules; simplifies wiring
  • 12, 24 or 48 VDC input/output; can be used with virtually any DC system
  • Use with positive, negative or floating ground; no need to stock multiple units to meet different site requirements
  • Digital meter displays: system bus voltage, battery voltage, total rectifier amperage, connect/disconnect voltage set points, and system ambient temperature
  • Up to five isolated distribution circuit breaker capacity with “BREAKER TRIP” alarm contacts; easy front panel plug-in installation. Breakers sold separately
  • Alarm LED (summary) indicates impending LVD disconnection, Power Module output fail or load circuit breaker trip
  • Summary alarm contacts (form C) allow remote monitoring of system status in the event of extended AC power loss
  • Manual battery disconnect switch allows service/replacement of batteries without system shutdown
  • High current output bus for wiring main system load or for feeding an external distribution panel
  • Ground bus provided
  • Low voltage battery disconnect protects batteries in the event of extended AC power loss

Overall Performance

    • Input/Output: 12, 24 or 48 VDC nominal, positive or negative ground
    • Voltage Range: 8 – 65 VDC
    • Grounding: Positive or Negative (Polarity insensitivity)
    • Maximum Total Current Capacity: 500 amps (max. 6 power supply/modules maximum)

Temperature Rating: 0° C to +60° C


  • Five branch circuit breakers (optional)
  • Low voltage battery disconnect (See LVBD Specifications below)


  • Heavy duty plated copper bus bar
  • Powder coated aluminum chassis
  • 19″ or 23″, 2 RU, flush or 6” forward rack mount

Case Size

Inches Centimeters Weight
H W* D H W* D lbs Kg
3.5 17 20.5 13.5 43.2 52.1 20 9.1
*19” and 23” mounting brackets provided


  • “ALARM” (summary) L.E.D. indicator (Red)
  • Digital volt/amp meter (selectable)
  • Form C summary alarm contacts; provide for monitoring of up to six inputs from equipment with either Form C or Normally Open contacts. Typical indications include Power Module failure, LVBD activation, breaker mid-trip condition
  • A separate set of Form C contacts are provided for pre-LVD activation

Rear Panel


Low Voltage Battery Disconnect Specifications

Factory set actuation voltages:

12 VDC 24 VDC 48 VDC
Connect 10.4V 21.0V 42.0V
Disconnect 12.0V 24.5V 49.0V

Factory Default LVD Pre-Disconnect Warning Alarm Threshold (Adjustable):

12 VDC 24 VDC 48 VDC
LVD Pre-Disconnect 11.2V 26.2V 45.5V


Circuit_BreakerPlug-in mid-trip circuit breakers with auxiliary contacts that activate “CHECK SYSTEM” indicator and summary alarm contacts.

Available amperages:

5A, 10A, 15A, 20A, 30A, 40A, 50A, 75A and 100Amp

(specify model PBA-5, PBA-10, etc.)



PM/PFM System

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