24 and 48 Volt, 150 – 450 Amps, N+1 Redundant, Rackmount DC Power System, Model Unity Rectifier System by Newmar Powering the Network

Unity Rectifier DC Power System

24 and 48 Volt, 150 - 450 Watts, N+1 Redundant DC Power System

The Unity Rectifier DC Power System comprises a low profile 1.75" (1 RU) shelf which accommodates up to three 150 watt, -48 or +24 volt hot-swap rectifiers, plus an optional GMT fuse distribution panel which contains five individually fuse-protected circuits. The 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.

Specifications: Unity Rectifier DC Power System

Shelf Input Capacity Size Weight
URS 115/230 VAC Nom. 3 Unity Rectifiers (-48 or +24 V),1 GMT fuse panel 19/23” Rackmount, 1 RU 6.7 lbs.
Rectifier Input Amps @ FullLoad 115/230V Output Voltage OutputAmps Cont. Watts Size Weight
UR48-3 2.2/1.1 -54.4 VDC, adjustable 42-56 VDC 3 150 1 RU 1.9 lbs.
GMT Panel NominalInput/Output Total FuseFuse Capacity Total CurrentCapacity Size Weight
UFP-5 -48 or +24 VDC 5 20A 1 RU 1 lbs.


  • 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

Models: 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.
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.

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.

Unity Stand-Alone Rectifier

For applications that do not require rack-mounting or redundancy, the Unity is available as a stand-alone rectifier. A versatile flange permits a myriad of mounting options, such as on the side of rack rails, inside cabinets, on walls or under shelves, maximizing use of restricted spaces.

The unit comes with a 6’ power cord and a rear-mounted terminal block for easy wiring. Performance specifications are identical to single Unity Rectifiers detailed on this page.


Rectifier Input Amps @ FullLoad 115/230V Output Voltage OutputAmps Cont. Watts Size Weight
USAR-48-3 2.2/1.1 -54.4 VDC, adjustable 42-56 VDC 3 150 1 RU 2.8 lbs.