molded case circuit breakers - Eaton Canada
molded case circuit breakers - Eaton Canada
molded case circuit breakers - Eaton Canada
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258<br />
SWITCHGEAR (TRIP UNIT RETROFIT KITS)<br />
Digitrip RMS Retrofit Kits for Westinghouse<br />
DS Breakers<br />
INTRODUCTION AND DESCRIPTION<br />
DS Breaker Retrofitted with<br />
Digitrip RMS 810 Retrofit Kit<br />
REPLACEMENT AND UPGRADE<br />
Create the Digitrip RMS Retrofit Kit catalog<br />
number to match the Cutler-Hammer or<br />
Westinghouse DS breaker type, retrofit kit<br />
type, protection function, rating plug type,<br />
current sensor type, CPT, and type of kit<br />
required for application. See the example<br />
provided on page 259.<br />
Application Notes for Cutler-Hammer or<br />
Westinghouse DS and DSL Power Circuit<br />
Breakers<br />
1. Retrofit kits are for use on 50 and<br />
60 Hz distribution systems.<br />
2. All retrofit kits are designed for Drawout<br />
Power Circuit Breakers only. Refer<br />
all fixed mounted breaker applications<br />
to the Cutler-Hammer Digitrip Retrofit<br />
Kit Technical Service Center at<br />
1-800-937-5487.<br />
Typical Digitrip RMS 810 Retrofit Kit<br />
for a DS Power Circuit Breaker<br />
3. The breaker compartment doors on<br />
the switchgear assembly must be free<br />
of panel mounted instruments and<br />
devices (i.e. ammeters, switches, etc.)<br />
or the retrofitted breaker may interfere<br />
with these devices when the compartment<br />
door is closed.<br />
4. When the Ground Fault (G) option is<br />
selected, please observe the following:<br />
a. For 3-phase, 3-wire solidly grounded<br />
systems, choose quantity three current<br />
sensors in the catalog number<br />
development.<br />
b. For 3-phase, 4-wire solidly grounded<br />
systems, choose quantity four current<br />
sensors in the catalog number<br />
development. Three sensors are<br />
mounted on the breaker and one<br />
sensor is mounted on the switchgear<br />
neutral. Hardware to mount<br />
Digitrip RMS Retrofit Kits for Westinghouse<br />
DS and DSL Power Circuit Breakers were<br />
first introduced in 1987. For a complete<br />
description of the Digitrip RMS Trip System<br />
and the features of Models RMS 510, 610,<br />
810, and 910, see page 247.<br />
Ratings<br />
Digitrip RMS Retrofit Kits are applied on<br />
DS <strong>breakers</strong> with frame ratings from 800A<br />
(DS-206) to 4000A (DS-840) as identified<br />
below. The rating plug and the current<br />
sensor rating act in concert to provide for<br />
a wide spectrum of overload and short<br />
<strong>circuit</strong> settings.<br />
Chronology<br />
Digitrip RMS Retrofit Kits and replacement<br />
trip units for DS Breakers became available<br />
around 1987. The Digitrip RMS 510<br />
Model is the modern day replacement for<br />
the Amptector Trip Systems.<br />
the current sensor on the switchgear<br />
neutral and provisions to wire<br />
it into the trip unit <strong>circuit</strong> (including<br />
a required pair of breaker secondary<br />
disconnecting contacts) are not<br />
included in the kit.<br />
5. RMS 510, 610, 810, and 910 Retrofit<br />
kits include a cell terminal block<br />
assembly that must be installed in the<br />
switchgear assembly. Internal switchgear<br />
wiring to accommodate the customer<br />
application schemes must be<br />
added in the field.<br />
6. RMS 610, 810, and 910 Retrofit Kits<br />
require a customer supplied 120 Vac<br />
source connected to the cell terminal<br />
block assembly to power the Digitrip<br />
RMS Digital Displays and Communications<br />
functions (as applicable).<br />
March 2001
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