2
Instruction Leaflet
IL 29C702E
Effective April 2015
Installation Instructions for the HKDDC
Circuit Breaker and Molded Case Switch
EATON CORPORATION www.eaton.com
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM MAINTENANCE ON
EQUIPMENT WHILE IT IS ENERGIZED. DEATH, SEVERE PERSONAL INJURY,
OR SUBSTANTIAL PROPERTY DAMAGE CAN RESULT FROM CONTACT
WITH ENERGIZED EQUIPMENT. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING WITH THE TASK, AND ALWAYS FOLLOW
GENERALLY ACCEPTED SAFETY PROCEDURES.
EATON 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 proce-
dures.
The recommendations and information contained herein are based
on Eaton experience and judgment, but should not be considered to
be all-inclusive or covering every application or circumstance which
may arise. If any questions arise, contact Eaton for further informa-
tion or instructions.
Figure 1. Type HKDDC Series C DC Circuit Breaker Frame With KT
Trip Unit Installed.
1. Introduction
General Information
In this document, the term circuit breaker includes molded case
switches. The K-Frame Series C DC circuit breaker (
Fig. 1
) type
HKDDC is rated 600 Vdc maximum and from 100A to 400A con-
tinuous current using type KT thermal-magnetic trip units. Refer to
Table 1
for all available trip unit ratings. The circuit breaker is listed
in accordance with Underwriters Laboratories, Inc. Standard UL
489. The type HKDDC circuit breaker is for use in grounded and
ungrounded applications where multiple poles are connected in
series (
Figures 2-5
). A 3-pole breaker may be wired as a 2-pole
with rated voltage and interruption based on the number of poles
wired in series. For grounded isolated load configurations, the inter-
ruption rating is based on number of poles in series that break the
ungrounded leg of the power supply.
This instruction leaflet (IL) gives procedures for installation and field
testing of the type HKDDC Series C DC circuit breaker.
Figure 2. Load Connected to Power Source. Grounded or
Ungrounded Systems.
Figure 3. Load Isolated from Power Source. Grounded or
Ungrounded Systems. If System Voltage Exceeds 300 Vdc, then
Ungrounded Systems Only.
