Eaton NRX Series User Manual

20
Series NRX Low Voltage Power (Air)
Circuit Breakers User Manual
EATON CORPORATION www.eaton.com
Instructional Book MN01301003E
Effective July 2011
Figure 22. Step 2
Step 3: Standard manually operated circuit breakers are closed and
opened by hand using the Manual ON and Manual OFF buttons
located on the front of the circuit breaker. To perform either operation,
press and release the appropriate button. Pressing the close button
will not close the breaker unless the Ready-to-Close flag displays
ready. The Ready-to-Close flag is adjacent to the spring status flag. The
Ready-to-Close flag will display not-ready if the breaker is closed, not
fully charged, or held in the tripped state by an accessory or interlock.
The status of the contacts (open or close) is indicated in the Contact
Status Window just above the pushbuttons on the front of the breaker.
Figure 23. Step 3
Figure 24. Step 3
Optional electrically operated accessories are available to automatically
close/trip a manually operated breaker.
Electrical operation
The springs on an electrically operated circuit breaker are normally
charged automatically through the use of an electrical operator. The
springs can, however, be charged manually as just described in the
last section. Electrically operated circuit breakers can also be manually
closed and opened through the use of the front mounted ON and OFF
buttons.
An electrically operated circuit breaker can be equipped with an
optional spring release (closing coil) to close the circuit breaker
remotely. The breaker can also be equipped with a shunt trip (opening
coil) to open the breaker remotely.
IMPORTANT
DIFFERENT DEGREES OF ACCESS TO PUSHBUTTONS ON THE FRONT OF THE
CIRCUIT BREAKER CAN BE ACHIEVED THROUGH THE USE OF OPTIONAL
ACCESSORY DEVICES.
Anti-pump feature
Series NRX circuit breakers have both mechanical and electrical anti-
pump features. If the circuit breaker is closed on a fault condition and
trips open while the CLOSE signal is maintained (using either the
mechanical pushbutton or the electrical close coil), it will not make a
subsequent attempt to close until the close command is removed and
reapplied.
ote:N If the close signal is applied prematurely (before the breaker is
completely charged and latched), the close command will be ignored
until it is removed and reapplied.
For electrical closing, a Latch Check Switch (LCS) option is available
that will block the application of the electrical close command until the
breaker is ready.

Eaton NRX Series Specifications

General

Brand	Eaton
Model	NRX Series
Category	Circuit breakers
Language	English