Eaton Logo

NRX Digitrip 520/520M

The NRX Digitrip line of trip units consists of the Digitrip 520 and 520M for UL/ANSI and IEC standards. The lowest available current setting is 200A for NF frame breakers, and 800A for RF frame breakers.

Protection settings options:

  • 520:
    • LI - Long delay, Instantaneous
    • LSI - Long delay, Short delay, Instantaneous
    • LSIG - Long delay, Short delay, Instantaneous, Ground Fault Trip
    • Instantaneous can be disabled for LSI and LSIG
  • 520M
    • 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 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.

Features:

  • 520
    • Protection only
    • Optional Zone Selective Interlocking (ZSI)
  • 520M
    • Current metering
    • Optional Arc Flash Reduction Maintenance Mode (ARMS) - can reduce arc flash incident energy that is generated on a fault condition
    • Optional Zone Selective Interlocking (ZSI)
    • Optional external CAM module for communications

The power module (DPS) for 520M:

  • 24 Vdc
  • 6 VA
  • Display will be functional even when the breaker has no load

Current metering starts at 2% of the rating plug value. The accuracy is 1% of the reading.

The green status LED blinks approximately once per second to indicate normal operations. 

NRX Digitrip 520 Time/Current Curve.

Additional Time/Current Curves are sorted by product.

Test kits