16
Instruction Leaflet
I. L. 29-888B
Effective July 2011
Instructions for Digitrip RMS 810 Trip Unit
eaton corporation
www.eaton.com
1.5 Potential Transformer Module
The Potential Transformer Module (PTM) (see Figure 11) is also
separate from the RMS 810 Trip Unit and is not required for the Trip
Unit to perform its protection functions . The Potential Transformer
Module provides three-phase primary voltage information necessary
for the Trip Unit to calculate power and energy values (see Figure 2) .
The Potential Transformer Module primary terminals are suitable for
all system voltage ratings up through 600 V, 50/60 Hz, and are con-
nected to the primary phase conductors inside the breaker, providing
stepped down voltage signals to input terminals V
A
, V
B
, V
C
, and V
N
on the rear of the Digitrip 810 Trip Unit housing .
The primary voltage connection to the Potential Transformer Module
is made through a disconnecting plug (see Figure 2) that can be
located either on the module (as shown in Figure 11) or on the side
of the circuit breaker, as indicated in the applicable circuit breaker
instruction leaflet (see Section 6) .
Figure 11. Potential Transfer Module.
CAUTION
APPLYING VOLTAGES GREATER THEN 600 VAC TO THE PRIMARY
CONDUCTORS OF THE CIRCUIT BREAKER, SUCH AS FOR DIELECTRIC
WITHSTAND TESTING, CAN POSSIBLY DAMAGE THE PTM OR THE TRIP
UNIT. FOLLOW THE INSTRUCTIONS GIVEN IN SECTION 4.1 FOR REMOVING
THE VOLTAGE DISCONNECT PLUG TO ISOLATE THE TRIP UNIT BEFORE
PERFORMING DIELECTRIC TESTS ON THE CIRCUIT BREAKER. SEE ALSO
THE SPECIFIC DIELECTRIC TEST PROCEDURES IN THE APPLICABLE CIRCUIT
BREAKER INSTRUCTION LEAFLET, LISTED IN SECTION 6.
Figure 12. Auxiliary Power Module.
1.6 Auxiliary Power Module
The Auxiliary Power Module or APM (Cat . No . PRTAAPM), illustrated
in Figure 12, is an encapsulated power supply that requires a 120 Vac
input at either 50 or 60 Hz . It provides an output of 32 Vdc (nominal
40 Vdc open circuit) which is used during testing of the Digitrip RMS
810 Trip Unit, whenever 120 VAC control power is not available to
the Power / Relay Module (see Section 1 .4) . When a drawout circuit
breaker is equipped with a Digitrip RMS 810 Trip Unit, it can be con-
veniently 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cell or in its cell in the "Test", "Disconnect", or "Withdrawn" positions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 1 .
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 .
2 UL Listed Devices
Digitrip RMS 810 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 .
Remove
Voltage
Disconnect
Plug before
Dielectric
Testing
Note: See
Applicable
Circuit
Breaker
Instruction
Leaflet
for
Actual
Location
Plug for 120Vac
Receptacle
Trip Unit Connector (Fits
into Keyed Cavity in Top Right
Corner of Trip Unit . See Figure 1 .)
