3
Instruction Leaflet
IL29C614F
Effective December 2011
Instructions for The Digitrip RMS 310 3-Pole and
4-Pole Trip Unit Installation and Operation with
K-Frame Series C Circuit Breakers
EATON CORPORATION
www.eaton.com
It operates from current signal levels and control power
derived through current sensors integrally mounted in
the trip unit.
Digitrip RMS 310 Trip Units are suitable for 50/60 Hz AC
applications only. For DC applications, a thermal-mag-
netic trip unit should be used.
The Digitrip RMS 310 Trip Unit is available in 4 different
types, (see Table
1-1
). Each trip unit contains a fixed
long delay time function (adjusted by changing the rating
plug), and may be equipped with a maximum of two
phase and two ground (time current)adjustments to meet
specific application requirements. The types of adjust-
ments available for each model include the following:
Protection
Type
1. Short Delay Pick-up
KESxxxxLS, LSE
2. Short Delay Pick-up/
Short Delay Time
KESxxxxLSI, LSIE
3. Short Delay Pick up/Ground
KESxxxxLSG
Fault Pick-up/Ground Fault Time
4. Short Delay Pick-up/Short
Delay Time/Ground Fault Pick-up
KESxxxxLSlG
/Ground Fault Time
2.0 UL LISTED DEVICES
The Digitrip RMS 310 Trip Unit is listed in accordance
with Underwriters Laboratories, Inc. Standard UL489,
under File E7819 and satisfies the applicable require
ments of the International Electrotechnical Commission
(IEC) recommendations for molded case circuit break-
ers.
3.0 INSTALLATION
3.1 PREPARATION (ALL TRIP UNITS)
The installation procedure consists of inspecting and
installing the trip unit and rating plug. To install the trip
unit, perform the following steps.
If required, internal accessory installation should be
done before the circuit breaker is mounted and con-
nected. Refer to individual accessory instruction
leaflets.
Make sure that the trip unit is suitable for the intended
installation by comparing nameplate data with any exist-
ing equipment and system requirements. Inspect the trip
unit for completeness, and check for damage before
installing it in the circuit breaker frame.
3-pole KES trip units may be used in 4-pole circuit
breakers if the fourth pole is unprotected. A 4-pole
Figure 1b Digitrip RMS 310 Trip Unit for 4-Pole K-
Frame Series C Circuit Breaker.
Figure 1a Digitrip RMS 310 Trip Unit for 3-Pole K-
Frame Series C Circuit Breaker.
NOTICE
NOTICE
