8
Instruction Leaflet
I. L. 29-885D
Effective August 2011
Instructions for Digitrip RMS 510 Trip Unit
EATON CORPORATION
www.eaton.com
1.2 Frame Rating, Sensor Rating (Where Applicable) and
Rating Plugs
The
Frame Rating
of a circuit breaker is the maximum RMS cur-
rent it can carry continuously . The maximum Short-Circuit Current
Ratings of the circuit breaker are usually related to the Frame Rating
as well .
It is often times desirable to be able to choose a current value
(I
n
)
,
less than the full frame rating, to be the basis for the circuit break-
er's protection functions, without affecting its short-circuit current
capability . For the Digitrip RMS 510 Trip Unit the maximum continu-
ous current (I
n
) is set by the
Rating Plug
(and/or
Current Sensors
,
where applicable) - see Section 5 for specific instructions for your
circuit breaker type .
The
(Current) Sensor Rating
(where applicable) is the maximum
RMS current the circuit breaker can carry with the specified current
sensors installed . The Sensor Rating can be the same or less than
the Frame Rating, but not greater .
The
Rating Plug
(see Figure 9) fits into a special cavity to complete
the Trip Unit (see Figure 2) .
Figure 9. Rating Plug.
CAUTION
BEFORE YOU FIT THE RATING PLUG INTO THE TRIP UNIT, BE SURE TO CHECK THAT
THE BREAKER TYPE AND FRAME RATING (OR SENSOR RATING IF APPLICABLE),
MATCH THOSE PRINTED ON THE RATING PLUG COVER. INSTALLING A RATING PLUG
THAT DOES NOT MATCH THE BREAKER TYPE AND FRAME RATING (OR SENSOR
RATING, IF APPLICABLE), CAN PRODUCE SERIOUS MIS-COORDINATION AND/OR
FAILURE OF THE PROTECTION SYSTEM.
After installing the Rating Plug, press and release the "TRIP RESET"
push-button to turn off any illuminated LEDs . The purpose of the
rating plug is to set the value of I
n
, the basis for the Trip Unit protec-
tion function current settings (see Section 3 for details) . Each circuit
breaker frame rating represents the maximum current it can carry
continuously . However for proper coordination of over-current pro-
tection, it is often desirable to choose different levels of I
n
for differ-
ent circuit breakers of the same frame rating . An assortment of rat-
ing plugs with different I
n
values is available for each breaker frame
rating (see circuit breaker instruction leaflet supplements listed in
Section 5) to give the user flexibility to change the value of I
n
with-
out having to change the primary current sensors on the breaker .
By changing the rating plug, the User can easily change the range
of current protection settings without having to remove the circuit
breaker from its enclosure .
Rating Plug
is for Type
SPB Circuit
Breakers Only
Rating Plug
for R-Frame
and DS
Breakers
are Similar
Values for Short
Delay S1 and S2
Instantaneous
M1 and M2
Settings
Pull Tab to
Remove
Battery
Rating Plug
Retention
Screw
Battery
Removal Tab
Polarity
Battery
-
+
Polarity
Marks
Rating Plug
Identification
"Battery
Check"
Push
button
Hinged
Cover
Battery "OK"
if LED Lights
"GREEN" when
"Battery Check"
Button is
Pushed
For example, if one expects a circuit to carry 600 A initially, but then
increase to 1400 A in the future, one could initially install
1600 A cables and a 1600 A breaker frame with the Trip Unit rating
plug whose I
n
= 800 A . Then later on when the additional load is
ready to come on line, the rating plug could be exchanged for one
with I
n
= 1600 A, without having to remove the breaker from its
enclosure . The available settings would give the following choices:
Long Delay Setting
I
r
= I
n
x: .5 .6 .7 .8 .85 .9 .95 1 .0
Plug I
n
=800 A
LDPU I
r
= : 400 480 560 640 680 720 760 800 A
Plug I
n
= 1600 A
LDPU I
r
= : 800 960 1120 1280 1360 1440 1520 1600 A
otee:
N
Rating plugs from Digitrip models 500 / 600 / 700 / 800 CANNOT be
used with model 510 Trip Units . The connection pins are located in different
positions, so one cannot accidentally use the incorrect type of plug .
Rating Plugs for the Digitrip RMS 510 Trip Units are marked for, and
may be applied on both 50 and 60 Hz systems .
Rating plugs have two current ratings listed on their covers (see
Figure 9) .
