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Magnum Digitrip 1150

The Magnum Digitrip line of trip units consists of the model 1150 that conforms to UL standards, and model 1150i that conforms to IEC standards. Appendix B in the 1150 trip unit instructional leaflet includes a troubleshooting guide.

Protection settings options:

  • LSI - Long delay, Short Delay, Instantaneous
  • LSIG - Long delay, Short Delay, Instantaneous, Ground Fault Trip
  • LSIA - Long delay, Short Delay, Instantaneous, Ground Fault Alarm
  • Instantaneous trip can be disabled

External control power is not required to operate the basic overcurrent protection functions; the trip unit operates through current sensors mounted in the breaker. When the breaker trips, an LED on the trip unit will indicate the cause of trip.


  • Arc Flash Reduction Maintenance Mode (ARMS) - can reduce arc flash incident energy that is generated on a fault condition
  • INCOM communications
    • The Power Xpert Gateway can be used to translate INCOM to an Ethernet output
    • Opening and closing the breaker via communications requires a shunt trip and spring release and additional wiring
  • PT module for voltage and power metering
    • Located on the top terminals by default
    • Option to mount on the bottom terminals

The power module (DPS):

  • Four voltage ratings: 120 Vac, 230 Vac, 24–48 Vdc, and 125 Vdc (100–140 Vdc operating range)
  • 10 VA
  • Without auxiliary power, the display will not be active, and there will be no communications or voltage data

Current metering starts at 0.02 per unit of the rating plug value. The tolerance is 1% of the rating plug value for phase and neutral, and 2% of the rating plug value for ground.

The green status LED at the bottom right of the trip unit blinks approximately once per second to indicate normal operations. 

Time/current curves are available on the Magnum website.

Factory default settings

Test kits