GFS Power

DC Rectifier System 48V or 24V

Unity Rectifier System


The Unity Rectifier System comprises a low profile 1.75″ (1 RU) Rectifier Shelf, which accommodates up to three 150 watt, -48VDC or +24VDC hot-swap Rectifier Modules, plus an optional GMT Fuse Distribution Panel, which contains five individually fuse-protected circuits. The Unity Rectifier System is scalable/adaptable for N, N+1 or N+2 configurations. Front panel test points and voltage adjustment pot are provided for fine-tuning output to the requirements of sensitive loads, and to optimize load sharing. Form C status contacts enable remote alarms for the Rectifiers and Fuse Distribution circuits. Front panel OK/FAIL LED’s allow monitoring status of each Rectifier individually. The optional Power Distribution Module employs industry standard GMT Fuses, configured with alarm contacts and a front panel “BLOWN FUSE” LED indicator.

Shelf Input Capacity Size Weight
URS 115/230 VAC Nom. 3 Unity Rectifiers (-48 or +24 V),
1 GMT fuse panel
19/23” Rack mount, 1 RU 6.7 lbs/3.4kg


Rectifier Input Amps @ Full
Load 115/230V
Output Voltage Output
Amps Cont.
Watts Size Weight
UR48-3 2.2/1.1 -54.4 VDC, adjustable 42-56 VDC 3 150 1 RU 1.9 lbs/0.86kg
UR24-6 2.2/1.1 +27.2 VDC, adjustable 21-28 VDC 6 150 1 RU 1.9 lbs/0.86kg


GMT Panel Nominal
Total Fuse
Fuse Capacity
Total Current
Size Weight
UFP-5 -48 or +24 VDC 5 20A 1 RU 1 lb/0.45kg

Optional System Component:

Unity Rack Mount Low Voltage Disconnect (LVD) and Monitor – (ULM-100)

Rack Mount LVD and monitor

The  Rack Mount LVD and Monitor (ULM-100) 19″ / 23″  1RU assembly contains numerous DC control and monitoring features that integrate power and distribution components into a highly functional system. more…….

Ordering information:

  • URS                       19″ / 23″ 1U Rectifier Shelf
  • UR48-3                  48VDC  3Amp  150Watt Rectifier module
  • UR24-6                  24VDC  6Amp  150Watt Rectifier module
  • UFP-5                     GMT Fuse Panel
  • GMT-1                    1Amp GMT Fuse
  • GMT-3                    3Amp GMT Fuse
  • GMT-5                    5Amp GMT Fuse
  • GMT-7.5                 7.5Amp GMT Fuse
  • GMT-10                  10Amp GMT Fuse
  • GMT-15                  15Amp GMT Fuse

Optional System Component:

  • ULM-100                Rack Mount LVD and Monitor
  • 150 watt rectifier units – 48 or 24 volt, slide and lock into the Unity Shelf
  • Shelf accommodates up to three rectifiers—450 watts total—plus an optional five-position GMT fuse panel
  • Scalable/adaptable hot swap configuration: N, N+1, N+2
  • Front panel status indicators, output voltage test points and adjustment potentiometers
  • Individual or summary rectifier alarm contacts; Form C
  • Summary fuse panel alarm contacts; Form C
  • Forced air cooling of rectifiers for extended component life
  • 115/230 VAC shelf/rectifier input—easily adapts to available site power
  • GMT fuse panel: Five positions, easy rear panel wiring to loads, fuse access at front
  • Shelf adapts for 19″ or 23″ rack; center or flush mount (four-point cabinet mount optional)

Unity Rectifiers


  • UR48-3
  • UR24-6

Input Voltage/Frequency/PF: 85-264 VAC* / 47-63 Hz. / .96-.98

Input Amperage:

  • 2.2 amps @ 115V and full load
  • 1.1 amps @ 230V and full load

Input Frequency: 47-63 HZ.
Power Factor: .96-.98
Output Voltage/Amperage*:

  • UR48-3: -54.4 VDC, adjustable 42-56 VDC, 3 amps continuous
  • UR24-6: +27.2 VDC, adjustable 21-28 VDC, 6 amps continuous

*100 % output power available from 105 to 264 VAC; Derate output linearly from 100%@105 VAC to 80%@85 VAC
Efficiency: 83% per rectifier
Regulation: +/- 2 %

  • UR24-6: 150 mV
  • UR48-3: 250 mV

Protection: Over-voltage, current limiting, over-temp, forced air cooling
Alarms/Indicators: Output failure contacts; Form C
Front panel LED indications: “DC OK/DC FAIL” Front panel voltage test points and adjustment
Operating Temperature: -10°C to +60°C; 100 % load to +50°C; Derate linearly to 80 % load @ 60°C
Weight: 1.9 lbs/0.86kg.
Design Standards:

  • EN55022 Class B,
  • EN61000-4-2,3,4,5,6,8,11,
  • EN61000-3-2,3,
  • UL 1950

Approvals: UL Recognized 60950

Unity Rectifier Shelf

Model: URS
Input: 115/230 VAC nominal
Capacity: Up to Three Unity Rectifiers, -48 or +24 volt and one GMT Fuse Panel (UFP-5)
Mounting: 19″ or 23″ rack; center or flush mount (four-point cabinet mount optional)
Weight: 6.7 lbs/3.4kg.

Unity Fuse Distribution Panel

Model: UFP-5
Voltage: -48 VDC or +24 VDC nominal (selectable by jumper)
Current: 20 amps max. total
Capacity: Five GMT fuses, 10 amps max. per individual fuse
Available Amperages: 1, 3, 5, 7.5, 10, 15 Amps

  • Output failure summary alarm contacts; Form C
  • Front panel blown fuse summary LED indicator
  • Individual visual blown fuse indication

Weight: .9 lb/0.45kg.

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