Technical data

CA01305001Z-EN www.eaton.com
12 IZMX circuit-breakers, INX switch-disconnectors
IZMX circuit-breakers, INX switch-disconnectors
IZMX circuit-breakers, I NX switch-disconnectors
Space-saving circuit-breakers with useful accessories
Eaton Introduces Series NRX!
The new NRX series from Eaton is a
new series of air circuit-breakers with
an extensive range of accessories.
The new range provides users with
two compact frame sizes up to 4000A,
modular design, common accessories,
easy to integrate communications and
a full range of trip units including the
new powerful high end 1150 Digitrip
trip unit with a full color LCD display.
The innovative concept of the IZMX16
makes it possible to install two with-
drawable circuit-breakers in a 600 mm
wide section. This enables more eco-
nomical section design and also saves
operating space. The compact modu-
lar design of the IZMX40 offers cus-
tomers a full range of high
performance ratings in a single frame
size simplifying the integration pro-
cess into panel boards and switch
boards. Series NRX, a new generation
and new standard in circuit protection.
Applications
The circuit breakers can be used in
four main application areas depending
on the type of equipment to be protect-
ed:
• System protection
• Motor protection
• Transformer protection
• Generator protection
These key applications make different
demands on the switches, which are
met with a range of control units.
Switches with closing release
They are particularly suitable for syn-
chronization tasks.
Coupler switches
In addition to the circuit-breakers,
switch-disconnectors are also avail-
able. These are used, for example, as
coupler switches between different
power supplies. The switch-discon-
nectors are used as coupler switches
for different sections of a network in
conjunction with our automatic net-
work switching device.
Modular Design, Common
Accessories
The retrofitting of accessories is made
considerably easy thanks to the effi-
cient “plug & work” technology. Ac-
cessory drawers and snap-fit
mechanisms make it possible to fit the
latest accessories with virtually no
tools. This flexibility allows you to re-
spond easily to changing requirements
within your system. Most accessories
for Series NRX are common to both the
compact and standard frame sizes.
Standard scope of delivery
• With the new Series NRX range, you
select a basic device that is already
fitted with an electronic release.
• The standard mounting for both
frames is on a horizontal mounting
plate or on horizontal traverses in
the switching cabinet. The IZMX16
can also be fastened to vertical
mounting plates.
• With four-pole devices, the neutral
conductor is arranged on the left
(front view).
• The neutral conductor can be load-
ed 100% like the phase conductors.
• The circuit-breakers are provided
with a standard mechanical reclos-
ing lockout. After an overload trip,
the fault is usually examined first.
After the fault is identified and recti-
fied, the mechanical reclosing lock-
out is reset by pressing the red
mechanical trip indicator on the
front of the circuit-breaker.
• A “remote-reset” feature and an
“automatic reset” are offered as ad-
ditional ordering options. The re-
mote reset enables resetting the
breaker after an over current trip via
a control voltage. The automatic re-
set option enables the circuit break-
er to be restored to normal
operation immediately after an over
current trip (i.e. there is no mechan-
ical reclosing lockout). In these ap-
plications compulsory fault analysis
is intentionally avoided.
• The number of secondary control
cable terminals depends on the ac-
cessories fitted.
• If a cassette is ordered without the
basic device, this can be already fit-
ted with the maximum number of
control cable terminals. For greater
economy in large plants, the cas-
sette is also offered without control
circuit terminals so that fitting can
be carried out later at the installa-
tion or when accessories are re-
quired at a later time..
• The withdrawable basic device in-
cludes the primary finger clusters
and levering-in mechanism. NOTE:
Some manufacturers mount the pri-
mary finger clusters inside the cas-
sette cell, which requiring shutdown
of the panel board for inspection
and maintenance.
• 2 changeover contacts are provided
as standard for ON/OFF status indi-
cation.
• A coding mechanism between the
basic device and the cassette pre-
vents impermissible combinations
(“Rejection Interlock”).
• The door escutcheon is always in-
cluded in the scope of delivery. With
withdrawable designs this is sup-
plied with the cassette (withrawable
unit).
• On withdrawable units the circuit
breaker can be pulled out to inspect
the arc chutes. With fixed units, it is
recommended that sufficient space
is provided above the circuit break-
er to enable inspection. An addi-
tional cover is not required.
• All basic devices that are provided
with universal protection (Digitrip
520M), feature a 4-digit LCD display,
and all devices provided with power
measurement protection feature a
full color LCD display.
• On each circuit-breaker the inte-
grated Digitrip electronic release is
factory fitted with a sealable protec-
tive cover.
• If a motor operator is ordered, the
“Spring-operated stored energy
mechanism tensioned” indicator
switch is automatically provided.
Additional benefits Series NRX
• The “universal” design of the main
terminal offers maximum flexibility.
The horizontal terminal can be rotat-
ed simply at the installation so that it
can also be used as a vertical con-
nection. With withdrawable units,
additional terminal pieces can even
be dispensed with. Both the
Series NRX breaker and the cas-
sette offer an integrated flange ter-
minal to which the system busbars
can be connected directly. For this
reason, the main terminal pieces for
Series NRX are not part of the stan-
dard scope of delivery. Don’t forget
to order additionally required termi-
nal pieces if required.
• Thanks to the separate mounting
position, a switching operations
counter can now be used also inde-
pendently of a motor operator.
• Withdrawable unit operation: The
unit is actuated with a hand crank
supplied as a standard feature and
has a secure position in the basic
device.
External 24 V supply
• The standard protection functions of
Series NRX operate independently
of an external control voltage sup-
ply. The power supply of the elec-
tronics unit, for example for
overload and short-circuit protec-
tion, is implemented via the current
transformers integrated in the cir-
cuit-breaker.
• The universal and power measure-
ment release units with display can
be fed with a 24 V DC supply so that
the display function can be used
without a load. An external 24 V DC
power supply is needed if communi-
cation functions are required
CurveSelect characteristics
program
Display characteristic curves accord-
ing to specific settings and assess
their interaction effectively:
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