Section 3: Breaker General Operation; Figure 11. Step 2; Figure 12. Step 3 - Eaton NRX Series User Manual

Instructional Book
Effective July 2011

Section 3: Breaker General Operation

MAKE CERTAIN THAT THE CASSETTE IS PROPERLY MOUNTED OR SEATED
SECURELY ON A WORK TABLE BEFORE ATTEMPTING TO HAVE THE BREAKER
FULLY EXTENDED ON THE CASSETTE'S DRAWOUT RAILS. FAILURE TO
COMPLY COULD RESULT IN THE CASSETTE TIPPING FORWARD RESULTING IN
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
Installing drawout circuit breaker into cassette
In a structure equipped for a drawout circuit breaker, a bolted-in
cassette with movable, captive extension rails supports the circuit
breaker.
IT IS IMPORTANT TO TAKE CARE WHEN PLACING A DRAWOUT CIRCUIT
BREAKER ON ITS EXTENSION RAILS. IF THE CIRCUIT BREAKER IS NOT
PROPERLY SEATED ON THE RAILS, THE BREAKER COULD FALL CAUSING
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
To install the drawout circuit breaker, proceed first with the following
four steps:
Step 1e: Press the extension rail spring away from the extension rail
until the retaining pin is fully released. Each drawout rail is provided
with a curved cutout to accommodate a gloved hand.
Extension
Rail Spring
Figure 10. Step 1
Step 2e: Lower both rails down into their extended and locked position.
16 EATON CORPORATION www.eaton.com
MN01301003E
CAUTION
CAUTION
Series NRX Low Voltage Power (Air)

Figure 11. Step 2

Step 3e: Carefully place the circuit breaker on the extended rails. Be
certain that the circuit breaker's metallic support wheels (two on each
side of the circuit breaker) are properly seated on the extension rails.
With breaker properly seated on the extension rails slide the breaker
fully into the cassette and raise both rails up into the cassette so
that they engage the extension rail spring. The breaker is now in the
cassette in the DISCONNECT position.

Figure 12. Step 3

Step 4e: To remove the breaker from the cassette lower both rails down
into their extended and locked position. Using the charging handle pull
the breaker out onto the extension rail.
Circuit Breakers User Manual