molded case circuit breakers - Eaton Canada
molded case circuit breakers - Eaton Canada
molded case circuit breakers - Eaton Canada
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250<br />
SWITCHGEAR (TRIP UNIT RETROFIT KITS)<br />
Digitrip RMS Rating Plugs<br />
INTRODUCTION AND DESCRIPTION<br />
Rating plugs for Digitrip RMS Trip Units<br />
determine the continuous current rating<br />
of the <strong>circuit</strong> breaker. All protection function<br />
settings on the face of the trip unit are<br />
expressed in per unit multiples of the<br />
rating plug ampere rating (In).<br />
The rating plug is interlocked with the tripping<br />
mechanism to automatically “open”<br />
the breaker when the plug is removed.<br />
The breaker will remain “trip free” with<br />
the plug removed.<br />
SPB Rating Plug and Details<br />
NOTE: At the time of this publication, the standard trip units for<br />
Low Voltage Digitrip Retrofit Kits are the RMS 510/610/810/<br />
910. From 1989-1996, the standard trip units were the RMS<br />
500/600/700/800. These trip units are no longer in production.<br />
Replacement orders for the 500/600/700/800 trip units<br />
will be filled by the equivalent 510/610/810/910 trip units.<br />
Remember when replacing a 500/600/700/800 unit with a<br />
510/610/810/910, the rating plug must also be replaced.<br />
SPB rating plugs must be selected to<br />
match the desired continuous current rating<br />
of the breaker as well as the frame rating<br />
and the system frequency, i.e., 50 or 60 Hz.<br />
DS and retrofit rating plugs must be<br />
selected to match the desired continuous<br />
current rating of the breaker, the sensor<br />
tap setting and the system frequency, i.e.,<br />
50 or 60 Hz.<br />
Rating plugs are equipped with a backup<br />
battery to maintain the mode of trip operation<br />
following a <strong>circuit</strong> breaker tripping<br />
Rating Plug for all<br />
Other Retrofitted Breakers<br />
DS Rating Plug<br />
when external power is not available. The<br />
battery is a long-life lithium type, that is<br />
accessible from the front of the trip unit,<br />
without removing the rating plug.<br />
Replacement types and instructions are<br />
provided in Application Data 33-855.<br />
Following a trip operation and with no<br />
supplementary control power available,<br />
the battery will maintain the mode of trip<br />
LED for approximately 60 hours.<br />
Rating plugs for the 500/600/700/800 trip units will still be<br />
available. These rating plugs are not interchangeable with<br />
the 510/610/810/910 trip units.<br />
Likewise, rating plugs for the 510/610/810/910 are not interchangeable<br />
with the 500/600/700/800 trip units.<br />
March 2001
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