9
Instruction Leaflet
I. L. 29-885D
Effective August 2011
Instructions for Digitrip RMS 510 Trip Unit
EATON CORPORATION
www.eaton.com
•
The "Must Use With Frame Rated" current value (or "Sensor
Rated", if applicable),
and
•
" I
n
(rated I)=" current value .
This latter value (I
n
) is the basis for the Trip Unit current settings:
•
The instantaneous and Ground Current Settings (if applicable) are
multiples of (I
n
) (see Sections 3 .6 and 3 .8 .) .
•
The Long Delay Current Setting,
I
r
is a multiple of (I
n
) . Long
Delay Current Setting =
I
r
= LD x (I
n
) (see Section 3 .2 .) .
•
The Short Delay Current Setting (if provided) is a multiple of
I
r
which in turn is a multiple of (I
n
) . Short Delay Current Setting =
SD x
I
r
= SD x LD x (I
n
) (see Section 3 .4) .
If the rating plug is missing or not well connected the instanta-
neous / override LED will be lit . If the circuit breaker is closed, it
will trip . If the rating plug condition is not corrected, as soon as the
three-phase current through the circuit breaker reaches 20% (40%
if single-phase current) of the frame / current sensor rating, the Trip
Unit will trip the breaker again .
As indicated in Figures 2 and 9, a back-up battery is provided to
maintain the mode of trip LED indication in the Digitrip RMS 510 Trip
Unit when external control power to the Power / Relay module is not
available . The back-up battery is located in the rating plug along with
a battery check push-button and a green battery check LED . The bat-
tery in the rating plug is "OK" if the LED lights "Green" when the "bat-
tery check" button next to it is pushed (see Section 4 .5) .
otee:
N
The back-up battery is used only to maintain the cause of TRIP LED
indication . It has NO part in the PROTECTION FUNCTION of the Trip Unit .
1.3 Auxiliary Power Module
The Auxiliary Power Module or APM (Cat . No . PRTAAPM), illustrated
in Figure 10, is an encapsulated power supply that requires a 120 Vac
input at either 50 or 60 Hz . It provides an output of 32 Vdc (nomi-
nal 40 Vdc open circuit) which is used during testing of the Digitrip
RMS 510 Trip Unit, When a drawout circuit breaker is equipped with
a Digitrip RMS 510 Trip Unit, it can be conveniently set and tested
while the circuit breaker is either out of its cell or in its cell in the
"Test", "Disconnect", or "Withdrawn" positions by using the Auxiliary
Power Module .
The Auxiliary Power Module is equipped with a unique plug-in con-
nector suitable only for plugging in to the keyed receptacle in the
upper right corner of a Digitrip RMS Trip Unit as shown in Figure 2 .
This avoids the inadvertent use of an incorrect type power module .
The APM is suitable for use with older Digitrip RMS 500, 600, 700,
800, as well as newer RMS 510, 610, 810, and 910 Models .
Figure 10. Auxiliary Power Module.
2 UL Listed Devices
Digitrip RMS 510 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 .
Plug for 120Vac
Receptacle
Trip Unit Connector (Fits into Keyed
Cavity in Top Right Corner of Trip
Unit . See Figure 2)
