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 communication adapter module (CAM) 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.
