molded case circuit breakers - Eaton Canada

256
SWITCHGEAR (TRIP UNIT RETROFIT KITS)
Digitrip RMS Retrofit Kits for Westinghouse
DB Breakers
INTRODUCTION AND DESCRIPTION
DB-25 Breaker Retrofitted with
Digitrip RMS 810 Retrofit Kit
REPLACEMENT AND UPGRADE
Create the Digitrip RMS retrofit kit catalog
number to match the Westinghouse DB
breaker type, retrofit kit type, protection
function, rating plug type, current sensor
type, CPT, and type of kit required for
application. See the example provided on
page 257.
Application Notes for Westinghouse DB
and DBL Power Circuit Breakers
1. Retrofit kits are for use on 50 and
60 Hz distribution systems.
2. All retrofit kits are designed for
Drawout Power Circuit Breakers only.
Refer all fixed mounted breaker applications
to the Cutler-Hammer Digitrip
Retrofit Kit Technical Service Center at
1-800-937-5487.
3. The breaker compartment doors on
the switchgear assembly must be free
of panel mounted instruments and
devices (i.e. ammeters, switches, etc.)
or the retrofitted breaker may interfere
with these devices when the compartment
door is closed.
Typical Digitrip RMS 810 Retrofit Kit
for a DB-25 Power Circuit Breaker
4. Type DB-15 and DBL breaker components
may have a metal baffle on the
inside of the compartment door. If so,
the baffle will have to be removed to
accommodate the retrofitted DB
breaker.
5. Contact Cutler-Hammer if the existing
DB breaker has an Undervoltage Trip
Device (UVTA), Bell Alarm, or Shunt
Trip.
6. When the Ground Fault (G) option is
selected, please observe the following:
a. For 3-phase, 3-wire solidly grounded
systems, choose quantity three current
sensors in the catalog number
development.
b. For 3-phase, 4-wire solidly grounded
systems, choose quantity four current
sensors in the catalog number
development. Three sensors are
mounted on the breaker and one
sensor is mounted on the switchgear
neutral. Hardware to mount
the current sensor on the switchgear
neutral and provisions to wire
Digitrip RMS Retrofit Kits for Westinghouse
DB and DBL Power Circuit Breakers
were first introduced in 1989. For a complete
description of the Digitrip RMS Trip
System and the features of Models RMS
510, 610, 810, and 910, see page 247.
Ratings
Digitrip RMS Retrofit Kits are applied on
DB breakers with frame ratings from 225A
(DB-15) to 4000A (DB-100) as identified
below. The rating plug and the current
sensor rating act in concert to provide for
a wide spectrum of overload and short
circuit settings.
Chronology
Digitrip RMS Retrofit Kits and replacement
trip units for DB Breakers became available
around 1989. The Digitrip RMS 510
Model is the modern day replacement for
the Amptector and RK Trip Systems.
it into the trip unit circuit (including
a required pair of breaker secondary
disconnecting contacts) are not
included in the kit.
7. RMS 510 Zone, 610, 810, and 910
Retrofit kits include a cell terminal
block assembly that must be installed
in the switchgear assembly. Internal
switchgear wiring to accommodate
the customer application schemes
must be added in the field.
8. RMS 610, 810, and 910 Retrofit Kits
require a customer supplied 120 VAC
source connected to the cell terminal
block assembly to power the Digitrip
RMS Digital Displays and Communications
functions (as applicable).
9. If the existing DB breaker has been
retrofitted with an Amptector Trip
System, and a Digitrip RMS retrofit
is desired, contact the Cutler-Hammer
Digitrip Retrofit Kit Technical Service
Center at 1-800-937-5487 for details.
March 2001