9
Instruction Leaflet
IL01301051E
effective September 2013
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON
www.eaton.com
Table 4. Technical Daoa
Digitrip 520 LI
System Protection
Digitrip 520 LSI(G)
Selective Protection
Digitrip 520M
Universal Protection
Ampere range
NF frame 200-1600A
RF frame 800- 4000A
NF frame 200-1600A
RF frame 800- 4000A
NF frame 200-1600A
RF frame 800- 4000A
RMS sensing
l
l
l
PrNoecoiNn and cNNrdinaoiNn
General
Ordering style options
LI
LSI, LSIG
MLSI, MLSIG, MLSIA,
MRLSI, MRLSIG, MRLSIA
Rating plug (I
n
)
l
l
l
Overtemperature trip
l
l
l
Long delay protection (L)
Long delay pickup
(0.5 – 1.0) x I
n
(0.5 – 1.0) x I
n
(0.5 – 1.0) x I
n
Long delay time t
r
at 6 x I
r
2 – 24 s
2 – 24 s
2 – 24 s
Long delay thermal memory
l
l
l
Short delay protection (S)
Short delay pickup
-
(2 - 10) x I
r
(2 - 10) x I
r
Short delay time t
sd
-
100 – 500 ms
100 – 500 ms
Zone Selective Interlocking ZSI
-
optional
optional
Instantaneous protection (I)
Instantaneous pickup
(2 - 12) x I
n
(2 - 12) x I
n
(2 - 12) x I
n
Off position
-
l
l
Making current release
l
l
l
Option earth fault protection (G)
Earth fault option
-
l
l
Earth fault alarm
-
-
l
Earth fault pickup
-
(0.25 - 1.0) x I
n
(0.25 - 1.0) x I
n
Earth fault delay t
g
, I
2
t @ 0.625 x (I
n
)
-
100 – 500 ms
100 – 500 ms
Ground (earth) fault delay t
g
, flat characteristic curve
-
100 – 500 ms
100 – 500 ms
Zone Selective Interlocking ZSI
-
optional
optional
Ground fault memory
-
l
l
Neutral protection
l
l
l
Sysoem diagnNsoics
Status/long pickup LED
l
l
l
High load alarm/alarm contacts
-
-
l
Cause of trip LEDs
l
l
l
Magnitude of trip information
-
-
l
Remote ground trip/alarm contacts
-
-
l
Sysoem meoering
Digital display
-
-
4 character LCD
Maintenance Mode (ARMS)
-
-
optional
I
n
= rating plug = rating of current sensors
I
r
= Long delay pickup setting
Requires 24 Vdc auxiliary voltage input (LSIG-ground trip alarm, LSIA ground alarm only).
Limited to1200 A for UL
®
rating
Four Cause of Trip LEDs: L, S, I, G. Current Release trip is indicated by the red instantaneous LED:
• Orange Instantaneous LED indicates rating plug trip
• Orange Long Delay LED indicates temperature trip
• Red or orange LED status indicates internal trip unit or circuit breaker diagnostic problem detected.
Requires 24 Vdc auxiliary voltage input and LSI style.