Eaton 520 - Digitrip High Instantaneous Trip; High Instantaneous Trip Feature

13
Instruction Leaet IL01301051E
effective September 2013
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON www.eaton.com
High instantaneous
For Series NRX NF-Frames, all models of the trip unit have a high
instantaneous trip feature. This element is always active even when
the customer instantaneous adjustment is set to the OFF position. The
high instantaneous is a separate analog peak detecting circuit that is
set in the frame rating module of the circuit breaker. It will initiate a
trip at a high current peak value which depends on the circuit breaker
types and ratings. It will indicate by flashing the red instantaneous
(INST) LED.
For the Series NRX RF-Frame, some models of the trip unit have a high
instantaneous trip feature. For specifics on instantaneous trip, please
reference RF-Frame time current curves, AD01301004E.
Figure 5. Block Diagram with Breaker Interface