depicted on the face of the trip unit provide mode of trip
indication for ground fault, overload and short circuit trip
operations.
Digitrip RMS Models 510, 610, 810, and 910 that are not
equipped with an adjustable instantaneous trip element
(LS and LSG) are provided with a making current release
which is referred to as a DIScriminator. The DIScrimina-
tor is switch selectable to disable this function. In addi-
tion, on all models, a high-level instantaneous override
circuit is provided to ensure rapid circuit clearing under
abnormal fault current conditions. The override is set for
16,000A
±
15%.
Digitrip RMS Trip Units are available in five basic models,
as illustrated in Fig. 2a: 310, 510, 610, 810, and 910.
Separate instruction leaflets referenced in Section 8.2
cover the basic functions and features of each model.
Digitrip OPTIM Trip Units are available in two models as
illustrated in Fig. 2b: 750 and 1050. A separate related
series of 3 instruction leaflets, referenced in Section 8.0,
cover the two trip unit models, the hand held OPTIMizer
and the panel mounted BIM (Breaker Interface Module).
This instruction book is arranged to describe the unique
features of each type as they relate to their application in
R- Frame Circuit Brea
k
ers. Table 1 illust
r
ates the
available functions and features of each of the trip unit
models.
3.0 RATING PLUGS
3.0.1 Digitrip RMS Plugs 510, 610, 810, 910
Rating Plugs, as illustrated in Figures 3.2 thru 3.4, deter-
mine the maximum continuous current rating of the circuit
breaker. All protection function settings on the face of the
trip unit are expressed in per unit multiples of the plug
ampere rating (
I
n
)
.
A fractional multiplier of the plug
ampere rating is set by the long delay setting switch to
further define the (l
r
)
continuous current rating for the
long time and short time functions. See curve references
in Section 8.3.
Available rating plugs are shown in Table 2b. Plugs must
be selected to match the desired continuous current rat-
ing of the circuit breaker as well as the frame rating.
3.0.2 Digitrip RMS 310- Plugs
This family of plugs is illustrated in Fig. 3.1. This plug
design will not mechanically fit into the other Digitrip
models. On the model 310 units the continous current
rating (I
r
) equals the rating plug ampere rating (
l
). The
Fig. 3.1 Typical Rating Plug for Digitrip RMS 310
plug scaled by the short delay pickup or instantaneous
switch settings provides short circuit protection levels.
See curve references in Section 8.3. Available rating
plugs are shown in Table 2a. Plugs must be selected to
match the desired continuous current rating of the circuit
breaker as well as frame rating.
3.0.3 Digitrip RMS Plugs for OPTIM, 750 and 1050
The Digitrip OPTIM rating plugs are similar in construc-
tion to the plug family described in Section 3.0.1. The
plugs are marked Digitrip RMS. The plug determines the
maximum continuous current rating of the circuit breaker.
The pickup settings are ultimally loaded via software into
the trip unit in per unit but are displayed for user
'
s ease as
an ampere value. The Long Delay Current Setting (Long
Delay Pickup) loaded in amperes via an external device
is actually a fractional multiplier of the plug ampere rating
(I
n
) and in turn defines a (
l
)
continuous current rating for
the long time and short time functions. See curve refer-
ences in Section 8.3. Available rating plugs are shown in
Table 2c. Plugs must be selected to match the desired
continuous current rating of the circuit breaker as well as
frame rating.
3.0.4 Rating Plugs Battery
For all models except Digitrip 310, rating plugs are
equipped with a back-up battery to maintain the mode of
trip operation following a circuit breaker tripping operation
when external control power is not available. The battery
is a long-life lithium type, that is replaceable from the front
of the trip unit, when required, without removing the rat-
ing plug. See Figs. 3.2 thru 3.4. Replacement types and
instructions are provided in the Digitrip RMS Trip Unit
instruction leaflet referred to in Section 8.2 of this book.
Following a trip operation and with no supplementary
control power available, the battery will maintain the
mode of trip LED for approximately 60 hours.
Effective Date October 2010
Instruction Leaflet 29C713E
Effective October 2010
EATON CORPORATION www.eaton.com
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n
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