Eaton Digitrip RMS 310 Instruction Manual

Instructions for Digitrip RMS 310 Trip Unit For Use with
R-Frame Breakers

TABLE OF CONTENTS

Description
1.0 General Information.. . . . . . . . . . . . . . . . . . . . . .
1.1

Protection.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Testing.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.0 Ul Listed Devices . . . . . . . . . . . . . . . . . . . . . . .
3.0 Principle Of Operation. . . . . . . . . . . . . . . . . . . . . .
3.1 General.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
3.3 Short Delayhstantaneous Trip . . . . . . . . . . . . . . 2
3.4 Ground Fault Protection. . . . . . . . . . . . . . . . . . . . 3
4.0 Protection Settings . . . . . . . . . . . . . . . . . . . . . . .
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Short Delay Pick-Up Settings . . . . . . . . . . . . . . . . 3
4.3 Short Delay Time Settings . . . . . . . . . . . . . . . . . . 3
4.4 Instantaneous Pick-up . . . . . . . . . . . . . . . . . . . . .
4.5 Ground Fault Pick-up Setting . . . . . . . . . . . . . . . 3
4.6 Ground Fault Time Setting . . . . . . . . . . . . . . . . . 3
5.0 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.0 Frame Ratings and Ratings Plugs . . . . . . . . . . . . 5
7.0 Reference.. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Digitrip Rms Trip Assemblies. . . . . . . . . . . . . . . . 5
7.2 R-Frame Molded Case Circuit
Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNING
DO NOT AlTEMPT TO INSTALL OR PERFORM MAIN-
TENANCE ON EQUIPMENT WHILE IT IS ENERGIZED.
DEATH, SEVERE PERSONAL INJURY, OR SUBSTAN-
TIAL PROPERTY DAMAGE CAN RESULT FROM CON-
TACT WITH ENERGIZED EQUIPMENT. ALWAYS
VERIFY THAT NO VOLTAGE IS PRESENT BEFORE
PROCEEDING WITH THE TASK, AND ALWAYS FOL-
LOW GENERALLY ACCEPTED SAFETY PROCE-
DURES.
THE CUTLER-HAMMER IS NOT LIABLE
FOR THE MISAPPLICATION OR MISINSTALLATION
OF ITS PRODUCTS.
The user is cautioned to observe all recommendations,
warnings, and cautions relating to the safety of personnel
and equipment as well as all general and local health and
safety laws, codes, and procedures.
Effective February 2006 Supersedes I.L. 29C883C dated July 2003
Courtesy of NationalSwitchgear.com
The recommendations and information contained herein
are based on Cutler-Hammer experience and judgement,
Page
but should not be considered to be all-inclusive or cover-
1
ing every application or circumstance which may arise. If
1
any questions arise, contact Cutler-Hammer for further
information or instructions.
2
1 .O GENERAL INFORMATION
1.1 Protection
2
The Digitrip RMS 31 0, illustrated in Figure 1, is an elec-
tronic trip unit that incorporates a microprocessor-based
3
custom application specific integrated circuit design for
3
use with R-Frame Molded Case Circuit Breakers.
3
Fig. 1 Digitrip RMS
Circuit Breakers
The Digitrip RMS 310 provides true RMS current sensing
for proper correlation with thermal characteristics of con-
ductors and equipment. Interchangeable rating plugs are
provided to establish the continuous current rating of
each circuit breaker.
I.L. 29C883E
310