Short Delay Time Setting; Instantaneous Current Setting; No Instantaneous Current Setting; Ground Fault Current Setting - Eaton Digitrip RMS 810 Instructions Manual

Instruction Leaflet I. L. 29-888B
Effective July 2011

3.5 Short Delay Time Setting

As illustrated in Figure 16, there are two different Short Delay curve
shapes, i .e ., fixed time (flat) and I
depends on the type of selective coordination chosen . The I
response will provide a longer time delay in the low-end of the short
delay current range than will the flat response .
Five flat ( .1, .2, .3, .4, .5 sec .) and three I
response time delay settings are available . The I
are identified by the suffix asterisk (*) that appears in the setting
viewing window . The I t response is applicable to currents less than
2
eight (8) times I the Long Delay Setting . For currents greater than 8
r
times I the I t response reverts to the flat response .
2
r
N otee: See also Section 1 .1 .5, Zone Interlocking .
:
,
:
.
.......
.
.
. .
.
,
.-----
"*" In Viewing Window
Indicates
2
I t
Shape
8 x I

Figure 16. Short Delay time Settings.

3.6 Instantaneous Current Setting

There are eight (8) available lnstantaneous Current Settings, as illus-
trated in Figure 17 . Six settings are in the range from 2 to 6 times
the rating plug value (I ), and the other two settings are "M1" and
n
"M2" times (I ) . The values that "M1" and "M2" have depend upon
n
the type of circuit breaker, and are specified both on the rating plug
label (see Figure 9), and on the applicable (I) Time-Current Curve ref-
erenced in Section 6 .
:-----
Setting Inst.
I
6 X
n
M1 and M 2 Values are Specified o n Rating Plug

Figure 17. Instantaneous Current Settings.

18
eaton corporation www.eaton.com
t response . The shape selected
2
t ( .1*, .3*, .5* sec .)
2
t response settings
2
Short Delay
Time
Available Settings
.1, .2, .3, .4, .5,
Seconds with
Flat Response
2
Shape
I t
Returns Flat
t o
Response at Currents
Higher than 8 x I
r
.1*, .3*, .5*
Seconds with
2
I t Shape
I
r
Available Settings
2, 2.5, 3, 4,
5, 6, M , M
1 2
In Multiples of
Rating Plug
Amperes
(I )
n
Instructions for Digitrip RMS 810 Trip Unit

3.7 No Instantaneous Current Setting

For types LS and LSG Trip Units, please see Sections 1 .1 .3
DlScriminator (High initial Current Release) and 1 .1 .4 OVERRIDE
(Fixed Instantaneous), for available fast-acting high short-circuit pro-
t
2
tection .

3.8 Ground Fault Current Setting

The eight (8) Ground Fault "Pick-up" Current Settings are labeled
with the code letters "A" through "K" (except there are no "G" or "I"
settings), as illustrated in Figure 18 . In general, the specific current
settings range from 0 .25 to 1 .0 times (I
cannot exceed 1200 A . The specific Ground Current Settings for
each letter are listed in Table 4 and on the (G) Time-Current Curve
applicable for the circuit breaker (see Section 6) .
N otee: For Testing Purposes Only: When using an external single phase current
source to test low level ground fault current settings, it is advisable to use the
Auxiliary Power Module (APM) (see Section 1 .6 and Figure 12) .

Figure 18. Ground Fault Current Settings.

Table 4. Ground Fault Current Settings.
100
200
250
300
400
600
630
800
1000
1200
1250
1600
2000
2400
2500
3000/3150
3200
4000
5000
 Tolerances on settings are ± 10% of values shown.
 Refer to Type DS, Type SPB, or Series C R-Frame supplemental instruction leaflets
given in Section 6 for list of available rating plugs for each type circuit breaker.
), the rating plug value, but
n
Available Settings
A.
Specific Values
Given o n Circuit
Breaker time-Current
Curve and in Table 1
Ground Fault current Settings

(amperes)
a B c D e
25 30 35 40 50
50 60 70 80 100
63 75 88 100 125
75 90 105 120 150
100 120 140 160 200
150 180 210 240 300
158 189 221 252 315
200 240 280 320 400
250 300 350 400 500
300 360 420 480 600
312 375 438 500 625
400 480 560 640 800
500 600 700 800 1000
600 720 840 960 1200
625 750 875 1000 1200
750 900 1050 1200 1200
800 960 1120 1200 1200
1000 1200 1200 1200 1200
1200 1200 1200 1200 1200
F H K
60 75 100
120 150 200
150 188 250
180 225 300
240 300 400
360 450 600
378 473 630
480 600 800
600 750 1000
720 900 1200
750 938 1200
960 1200 1200
1200 1200 1200
1200 1200 1200
1200 1200 1200
1200 1200 1200
1200 1200 1200
1200 1200 1200
1200 1200 1200