GFS Power

DC Power System 48V…Sentinel

Sentinel Rectifier System
Incredible Functionality, and Scalability in a 1 RU, 600 Watt to 1.8 Kw DC Power System

  • 19″, 1U rackmount shelf with integrated power distribution and SNMP digital controller
  • 90-250 VAC input, power factor corrected
  • 3 power bays accept 600 watt modular rectifiers, -48V
  • 33 amp, 1800 watt total max. output capacity
  • Output temperature compensated for precise battery charging
  • 4 DC circuit breaker distribution capacity, with tripped breaker alarm
  • Master disconnect breaker for two battery banks, with tripped breaker alarm
  • Controller with digital display of system parameters with TCP/IP interface and SNMP monitoring/logging
  • Alarm contacts monitor major system functions
  • Low voltage disconnect built-in
  • Easily configures to meet site power requirements

System Power Configurations @ 48V, 90-300 VAC Input
Watts Per Rectifier # of Rectifiers Installed
1 2 3
600 11A (600W) 22A (1200W) 33A (1800W)


AC Input:

  • Nominal: 115 or 230VAC
  • Voltage Range: 90 – 300V
  • Frequency Range: 45 – 100Hz
  • Power Factor: >0.99
  • Efficiency: >92% (>50% output power)

DC Output:

  • Voltage: -48 Volt
  • Output Ratings: Constant Power Output From 54V To 58V
  • Nominal Voltage: 48V
  • Rated Voltage: 54V


  • Rated maximum System Output Power: 1800Watt @ 54V
  • Polarity: Positive Earth. 48 Volt
  • Individual Rectifier Power: 600Watt amperage @ 115 or 230 VAC in 4.2

DC Distribution:

  • Load: 4 breaker position capacity, available amperages (specify) 6A, 10A, 20A, 30 amp, with tripped breaker alarm
  • Battery: 2 x 30A battery circuit breakers.
  • Breaker Fail Detection: Electronic fail detection on both load and battery. Breakers
  • Low Voltage Battery Disconnect: 80A battery LVD installed standard, with disconnect alarm

Monitoring & Control:

Monitors all power system conditions including DC voltage, rectifier current, battery current, battery temperature, and distribution failure. Visual notification of alarm conditions by LED’s and a 4 line x 16 character alpha numeric display mounted on the front panel, with remote notification being enabled by relay contacts, RS232 or TCP/IP (using SNMP). It has built-in web based controls allowing setup of system parameters using a web browser and utilizes a USB communications port which allows for local monitoring of system operations as well as easy downloading of configuration files for multiple site installations.


  • Current Limit: Adjustable to 50-100% of maximum rated current.
  • Over Temperature: Automatic current reduction, backup shutdown protection.
  • Polarity Reversal: Output fuse with crowbar diode.
  • Over Voltage: Adjustable limit.
  • Input Voltage: Auto shutdown, auto restart when correct voltage restored.
  • Input Inrush: <2x maximum input current.
  • Input Fuses: In phase and neutral.

Technical Characteristics:

  • Noise: Ripple <100Hz: <1mV rms unweighted
  • Voice band 100Hz-5KHz: <2mV rms psophometric
  • Wide band 5kHz-1MHz: <5mV rms unweighted
  • Peak to Peak 0-20MHz: <50mV peak to peak
  • Isolation: Input to Output: 4000V DC.
  • Input to Chassis: 3500V DC (VDR to chassis removed)
  • Output to Chassis: 2100V DC
  • Regulation: Line = +/-0.1%, Load = +/-0.5% (no load to full load)


  • Shelf: Dimensions: 19″ W x 1.75″ H x 10.2″ D
  • Weight: 19.84 Lbs. (excluding rectifier modules)
  • Rectifers: Dimensions 2.2″ W x 1.7″ W x 9.25″ D
  • Weight: 1.7 Lbs
  • Cooling: Forced cooled


  • Ambient Temperature: Nominal:
  • Range: -20˚ C to +70˚ C (maximum output power is derated above +50˚ C)
  • Humidity: 0-98% RH (non-condensing)
  • Altitude: <3,000 M., De-rate maximum ambient temperature by 4˚ C per 1,000 M. above sea level.


  • Safety: EN60950
  • Electrostatic Discharge: CISPR24
  • Radiated Radio Freq: CISPR22
  • AC Harmonics: EN61000-3-2
  • AC Flicker & Fluctuation: EN61000-3-3
  • Other: CE & RoHS compliant

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