17
Instructional Book
MN01301003E
Effective July 2011
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION
www.eaton.com
Figure 13. Step 4
Rejection interlocks
Series NRX drawout circuit breakers come in a variety of continuous
current and interrupting ratings. To prevent the insertion of a drawout
circuit breaker into a cell with which it is incompatible, rejection
interlock key plates are provided for both the circuit breaker and the
cassette. One key plate is located on the bottom of the circuit breaker
and one is located on the floor of the cassette. Rejection pins must
be installed in both plates to complete the interlock scheme.
The
switchboard builder is responsible for installing the rejection
pins in the appropriate pattern in the rejection plates on both the
circuit breaker and cassette.
A rejection pin installation kit, including
the instruction leaflet IL01301006E, is supplied by the factory for this
purpose.
WARNING
NEVER ATTEMPT TO DISABLE ANY INTERLOCKS. DOING SO COULD RESULT
IN AN ELECTRICAL FAULT THAT COULD RESULT IN DEATH, BODILY INJURY,
AND/OR EQUIPMENT DAMAGE.
Drawout circuit breaker positioning
Series NRX drawout circuit breakers have four normal positions:
•
WITHDRAWN (
Figure 14
)
•
DISCONNECT (
Figure 15
)
•
TEST (
Figure 16
)
•
CONNECT (
Figure 17
)
The WITHDRAWN position is outside the compartment on the
cassette’s drawout rails. The DISCONNECT, TEST, and CONNECT
positions are reached by means of the levering mechanism and can be
achieved with the assembly door closed.
•
Breaker out of cassette
•
Primary connections not made
•
Secondary connections not made
Figure 14. WITHDRAWN Position
•
Breaker in cassette
•
Primary connections not made
•
Secondary connections not made
Figure 15. DISCONNECT Position
