5
Instruction Leaflet IL 29C101H
Effective January 2011
Installation Instructions for EHD, EDB, EDS, ED, EDH, EDC, FDB, FD,
HFD, FDC, HFDDC Circuit Breakers and Molded Case Switches
EATON CORPORATION www.eaton.com
5. HFDDC
5-1. The HFDDC circuit breakers and switches are qualified for direct
current voltages and interruptions with multiple poles wired in
series.
5-2. See Figures 5, 6, 7, and 8 for typical wiring configurations. A
3-pole breaker may be wired as a 2-pole.
5-3. For grounded insulated load configurations, the interruption rat-
ing is based on number of poles in series that break the ungrounded
leg of power supply.
Figure 5. Load Connected to Power Source. Grounded or
Ungrounded Systems.
Figure 6. Load Isolated from Power Source. Grounded or
Ungrounded Systems. If System Voltage Exceeds 300 Vdc, then
Ungrounded Systems Only.
Power
Load
Power
Load
Breaker Breaker
3 Pole 3 Pole
Load Connected to Power Source.
Grounded or Ungrounded Systems.
Fig. 5-1
Figure 7. Load Connected to Power Source. Grounded or
Ungrounded Systems.
Figure 8. Load Isolated from Power Source. Grounded or
Ungrounded Systems. If System Voltage Exceeds 125 Vdc, then
Ungrounded Systems Only.
Breaker
Load
Power
Breaker
Load
Power
2 Pole 2 Pole
Load Connected to Power Source.
Grounded or Ungrounded Systems.
Fig. 5-3
Power
Load
Power
Load
Breaker Breaker
3 Pole
3 Pole
Load Isolated from Power Source.
Grounded or Ungrounded Systems.
If System Voltage Exceeds 300 Vdc.
Then Ungrounded Systems Only.
Fig. 5-2
Breaker
Power
Load
2 Pole
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