Eaton Cutler-Hammer Digitrip RMS 510 - Digitrip RMS

AD 33-855-4
Page
19
3.8
Digitrip
RMS Retrofit
Rating
Plug and
Battery
The Digitrip
RMS Rating
Plug fits
into the Digitrip
RMS
Trip Unit and determines
the Breaker
Con-
tinuous
Current
Rating,
ln. The Rating
Plug
must
be matched
to the
installed Current
Sensor
ratio.
The
Rating
Plug can be used
in 50
Hz or 60
Hz
applications.
Each
Rating Plug
has fixed
S1
(8)
and
52
(10)
values,
which correspond
to
the Trip Unit's
highest two Short
Delay Settings.
Each Rating
Plug also
has fixed
Ml
(8)
and
M2
(12)
values,
which correspond
to
the Trip Unit's
highest
two
lnstantaneous
Settings.
Each
Rating
Plug is equipped
with a
long life, 3.0
Volt lithium
type back-up
battery.
This back-up
battery
is not required
for
the basic Digitrip
RMS
Overcurrent
Protective
Functions.
lt is used
to
maintain
the Trip Unit
mode of
trip indication
LEDS,
following
a
Breaker tripping
operation,
when
no
120 VAC
control
power
source
(through
the
ATR) to
the
Trip Unit
is applied.
A new
battery
will maintain
the mode
of trip LED
for approximately
60 hours
when
no 120
VAC source
is applied
to the
Trip
Unit.
The battery
is replaced
from the
front, without
having
to remove
the Rating
Plug
from the
Trip
Unit.
Replacement
battery
types are
listed under
the Accessories,
Section
2, of this
Application
Guide.
SPB
Rating
Plugs are
matched
to the
Breaker
Frames
which are
suitable.
The Rating
Plug
At-
tachment is accomplished
by use
of a specific
Rating Plug
screw
size and
length.
lf a
Rating
Plug is removed
when
the Breaker
is in
the closed
position,
the Breaker
may
trip. There-
fore, the
Rating
Plug must
be securely
plugged
in
and
the Trip Cover
put
back on
the
Trip Unit to
assure
that the
Rating Plug
stays
in
place"
Fig. 3-6
Digitrip
RMS Direct
Trip
Actuator
(DTA)
Etiective
g/01
ElT.il