336 / 543
2010 CA08103002Z-EN
www.eaton.com18/6 IZM circuit-breakers, IN switch-disconnectors
IZMX16 air circuit-breakers, INX16 switch-disconnectors
IZMX16aircircuit-breakers, INX16 switch-disconnectors
Space-saving circuit-breakers with useful accessories
IZMX16, INX16
IZMX16
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
economical section design and also
saves operating space. This additional
performance in a minimum of space
goes far beyond the standard available
worldwide.
Applications
The circuit-breakers can be used in
four main application areas depending
on the type of equipment to be
protected:
• 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
synchronization tasks.
Coupler switches
Beside the IZMX16 circuit-breakers,
INX16 switch-disconnectors are
available. These are used, for
example, as coupler switches
between different power supplies.
Modular design
The retrofitting of accessories is made
considerably easy thanks to the
efficient “plug & work” technology.
Accessory drawers and snap-fit
mechanisms makes it possible to fit
the latest accessories with virtually no
tools. This allows you to respond
flexibly to changing requirements
within your system.
Standard scope of delivery as
usual
• With the new IZMX16, you select
a basic device that is already fitted
with an electronic release.
• The standard mounting 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
loaded 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 of
all. After the fault is identified and
rectified, the mechanical reclosing
lockout is reset by pressing the red
mechanical trip indicator on the
front of the circuit-breaker.
• An “Automatic Reset” can be
ordered as an option. This enables
the circuit-breaker to be restored to
operation immediately at any time
after the spring-operated stored
energy mechanism is retensioned.
In these applications compulsory
fault analysis is intentionally
avoided.
• The number of control cable
terminals depends on the
accessories fitted.
• If a cassette is ordered without the
basic device, this can be already
fitted with the maximum number of
control cable terminals. For greater
economy in large plants, the
cassette is also offered without
control circuit terminals so that
fitting can be carried out later at the
installation or when the required
accessories are determined at a
later time.
• 2 changeover contacts are provided
as standard for ON/OFF status
indication.
• A coding mechanism between the
basic device and the cassette pre-
vents impermissible combinations
(“Rejection Interlock”).
Expanded standard scope of
delivery for IZXM16
Some order types from the past can no
longer be found since the following
options are now already part of the
standard scope of delivery:
• The door escutcheon is now always
included in the scope of delivery.
With withdrawable designs this is
supplied with the cassette (with-
rawable 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-
breaker to enable inspection.
An additional cover is not required.
• All basic devices that are provided
with universal protection (with
Digitrip 520M…), now feature a
display.
• On each circuit-breaker the
integrated Digitrip electronic
release is factory fitted with a
sealable protective cover.
• If a motor operator is ordered, the
“Spring-operated stored energy
mechanism tensioned” indicator
switch is automatically provided.
Other benefits of the IZMX16
• The design of the main terminal
offers maximum flexibility. The
horizontal terminal can be rotated
simply at the installation so that it
can also be used as a vertical
connection. With withdrawable
units, additional terminal pieces can
even be dispensed with.
The cassette of the IZMX16 offers
an integrated flange terminal to
which the system busbars can be
connected directly. For this reason,
the main terminal pieces for IZMX16
are not part of the standard scope of
delivery. Don’t forget to order
additionally required terminal
pieces if needed.
• Thanks to the separate mounting
position, a switching operations
counter can now be used also
independently 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. This is now
possible also with a standard tool
(square drive socket 1/4").
External 24 V supply
• The standard protection functions
of the IZMX16 operate generally
independently of an external control
voltage supply. The power supply
of the electronics unit, for example
for overload and short-circuit
protection, is implemented via the
current transformers integrated in
the circuit-breaker.
• The universal release unit with
display can be fed with a 24 V DC
supply if required so that the display
function can also be used without a
load. An external 24 V DC power
supply is needed if communication
functions are required.