Power Supply Model 251


The Model 251 Power Supply will deliver up to 9 amperes at approximately 13 VDC, regulated, from a 117 VAC 50-60 Hz source. An electronic latching circuit breaker shuts down the output voltage when a current in excess of 10 amperes is drawn from the supply. Reset is accomplished by cycling the POWER switch. Two indicator lamps monitor the LINE and OUTPUT voltages. The primary circuit is fused with a slo-blo fuse. The output voltage is available through a six pin Jones connector and a phono gype jack for low current applications. Two of the six Jones pins are used for remote power on-off switching, if desired. Will accept the Model 207 ammeter.


  • Input Voltage: 117 VAC, 50-60 Hz.
  • Output Voltage: 13 VDC, +/- 0.5 V, regulated.
  • Construction: Aluminum with molded plastic side panels.
  • Output Connectors: One 6 pin Jones type, one phono jack for low current, one phono jack for Model 207 Ammeter.
  • Output Current: 9 amperes continuous, full load. 10 amperes, maximum.
  • Circuit Breaker: Electronic latching. Factory set to trip at 10 A.
  • Ripple: Less than 25 mV, peak-to-peak @ 9 A and 117 VAC.
  • Size: HWD 4.5" x 8.25" x 8"
  • Weight: 9.5 lbs.

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