15
Instruction Leaflet
I. L. 29-886B
Effective August 2011
Instructions for Digitrip RMS 610 Trip Unit
eaton corporation
www.eaton.com
2 UL Listed Devices
Digitrip RMS 610 Trip Units are "Listed" by the Underwriters
Laboratories, Inc .
®
under UL File E7819, for use in types DS, DSL,
SPB, and Series C
®
R-Frame circuit breakers .
3 protection Settings
3.1 General
Prior to placing any circuit breaker in operation, each Trip Unit pro-
tection setting must be set to the values specified by the person
responsible for the installation . The number of settings that must
be made is determined by the protection supplied as illustrated in
Figures 12 through 18 . Each setting is made with a rotary switch,
using a small screwdriver . The selected setting for each adjustment
appears in its respective rectangular viewing window as illustrated in
Figure 1 .
The installed rating plug establishes the maximum continuous cur-
rent rating (I
n
), up to, but not exceeding the Frame Rating of the cir-
cuit breaker . Instantaneous and ground current settings are defined
in multiples of (I
n
) .
To illustrate the effect of each protection curve setting, simulated
Time-Current curves are pictured on the face of the Trip Unit . The
rotary switch used to make each setting is located nearest that
portion of the simulated Time-Current curve it controls . Should an
automatic "TRIP" occur (as a result of the current exceeding the
pre-selected value), the LED in the appropriate segment of the simu-
lated Time-Current curve will light "RED", indicating the reason for
the "TRIP" .
The available settings, along with the illustrated effect of changing
the settings are given in Figures 12 through 18 .
3.2 Long Delay Current Setting
There are eight (8) available Long Delay "Pick-up" Current Settings, as
illustrated in Figure 12 . Each setting, called "
I
r
”
, is expressed as a
multiple (ranging from 0 .5 to 1) of the rating plug current (I
n
) .
otee:
N
"
I
r
"
is also the basis for the Short-Delay Current Setting (see
Section 3 .4) .
Figure 12. Long Delay Current Settings.
Long Delay
Available Settings
Setting
.5, ,6, .7, .8,
.85, .9, .95, 1
In Multiples
of
Rating Plug
Amperes
I
r
I
r
I
r
I
n
(I )
n
I
r
