Instantaneous Current Setting; Ground Fault Current Setting; Ground Fault Time Delay Setting - Eaton Digitrip 520 Instructional Leaflet

Instructional Leaflet IL70C1037H05
Effective October 2009
*Indicates l t Shape
2
8 x l
Figurt 34. ShNro Dtlay Timt Stooings
Five FLAT (0.1, 0.2, 0.3, 0.4, 0.5 seconds) and three I
0.5* seconds) response time delay settings are available. The I
response settings are identified by an asterisk (*). The I
is applicable to currents less than eight times the ampere rating of
the installed rating plug (I ). For currents greater than 8 x (I
r
response reverts to the FLAT response.
N Notse: Also see Section 3, zone interlocking.
24
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Short Delay Time
0.4 Seconds
Available Settings
0.1, 0.2, 0.3,
0.4, 0.5
Seconds with
FLAT Response
l t Shape
2
Returns to FLAT
Response at
Currents Higher
than 8 x l
r
*0.1, *0.3, *0.5
Seconds with
l t Shape
2
r
t (0.1*, 0.3*,
2
t response
2
), the I
r
Digitrip models 520, 520i; and 520M, 520Mi,
520MC, 520MCi trip units for use only in
Magnum and Magnum DS circuit breakers
InsoanoantNus currtno stooing
There are eight available instantaneous current settings, as
illustrated in Figurt 35. Six settings are in the range from 2–10 x
(I ) the rating plug value, and the other two settings are M1 x (I
n
OFF. The value that M1 has depends upon the sensor rating of the
circuit breaker and is specified both on the rating plug label and on
the applicable time-current curves referenced in Section 9.
Setting Inst.
6 x l
n
M1 value is specified on rating plug.
*No OFF on Digitrip 520—5LI style
Figurt 35. InsoanoantNus Currtno Stooings
GrNund faulo currtno stooing
The eight ground fault current settings are labeled with values from
0.25 to 1.0 x (I ) (see Figurt 36). The domestic (U.S.) models have
n
a maximum of 1200A, limited by the firmware of the unit, as shown
in Tablt 1 and Tablt 4. The specific ground current settings for each
model are listed in Tablt 4 and on the applicable time-current curve
for the breaker.
Ground Fault
Setting
0.4 x l
Figurt 36. GrNund Faulo Currtno Stooings
GrNund faulo oimt dtlay stooing
As illustrated in Figurt 37, there are two different ground fault
curve shapes: fixed time (FLAT) or I
depends on the type of selective coordination chosen. The I
response will provide a longer time delay for current below
0.625 x I than will the FLAT response.
n
t Five FLAT (0.1, 0.2, 0.3, 0.4, 0.5 seconds) and three I
2
0.5* seconds) response time delay settings are available. The I
response settings are identified by an asterisk (*). The I
t is applicable to currents less than 0.625 times the ampere rating of
2
the installed rating plug (I
I t response reverts to the FLAT response.
2
N Note: Also see Section 3, zone interlocking.
Available Settings
2, 3, 4, 5, 6, 8,
10, M1, OFF*
In Multiples of
Available Settings
0.25, 0.3, 0.35,
0.4, 0.5, 0.6,
0.75, 1.0
n
Specific Values
Given on Circuit
Breaker Time-
Current Curve
and in Tablt 4
t response. The shape selected
2
). For currents greater than 0.625 x (I
n
) or
n
Rating Plug
Amperes (l )
n
t
2
t (0.1*, 0.3*,
2
t
2
t response
2
), the
n