Eaton Industrial Switchgear - XEnergy XPole Energy distribution, switching and protection

2010 CA08103002Z-EN

www.eaton.com

IZM circuit-breakers, IN switch-disconnectors

IZM26 air circuit-breakers, Switch-disconnector IN26

18/45

Other benefits of the IZM26

• There are still four main variants of

overcurrent release units. Only the

fourth variant was renamed and is

now “P” (as in Power Measurement)

instead of “D” (as in Digital trip).

On each P circuit-breaker (Digitrip

1150) the power measurement is

already an integral part of the

electronic release.

• The voltage tap-off for power

measurement is integrated in the

device so that an additional external

voltage transformer is unnecessary.

This solution saves costs, space and

installation effort.

• Certain applications require the

use of an interface to the external

control voltage supply (see below).

A new feature is that the electronic

release can be prepared for an

external control voltage supply of

120 V AC or 240 V AC (order option).

• A switching operations counter can

now be used thanks to the separate

mounting position, also indepen-

dently of a motor operator.

• Withdrawable unit operation: The

unit is actuated with a hand crank

supplied. This is now possible also

with a standard tool (square drive

socket 3/8").

• Four sizes are available to ensure

the optimum device for any applica-

tion. As before, the entire rated

operational current range from

800 A to 6300 A can be covered with

two sizes.

• Sizes IZM40 and IZM63 are pro-

duced in simple terms by doubling

sizes IZM20 and IZM32. This conse-

quently provides on the IZM40 and

IZM63 two terminals for each phase

on the incoming side and on the

outgoing side. This facilitates the

thermal design of the switchboard

and in some switchboard systems

simplifies production and reduces

the number of busbar adapter

variants.

• The phase sequence for the

IZM40 and IZM63 is as follows:

(NN)AABBCC.

• The IZM for 6300 A is now offered

with horizontal connection as stan-

dard, thus considerably simplifying

the busbar connection for most

switchboard systems.

External control voltage supply

• The standard protection functions of

the IZM26 operate generally inde-

pendently of an external control

voltage supply. The power supply of

the electronics unit, for example for

overload and short-circuit protec-

tion, is implemented via the current

transformers integrated in the

circuit-breaker.

• The universal release unit with dis-

play can be fed with a 24 V DC/48 V

DC supply or a 120 V AC or 240 V AC

supply if required so that the display

function can also be used without a

load. An external power supply is

needed if communication functions

are required.

• The P release unit should always be

operated with an external power

supply as it is normally selected due

to its extensive control voltage

dependent functions.

Communication capability

The communication-capability of the

IZM26 circuit-breakers enable them to

open up new possibilities in power

distribution. They can thus provide

and transmit all important operational

information. This increases system

transparency and shortens the

response times to states such as over-

current, phase asymmetry and over-

voltage.

A rapid intervention in a process can,

for example, prevent downtimes and

help to schedule maintenance activi-

ties and therefore boost plant avail-

ability.

A Modbus interface is offered as an

alternative in addition to the Profibus

interface.

Greater safety for maintenance

personnel with ARMS™

If the IZM26 is fitted with the newly

patented ARMS system (Arcflash

Reduction Maintenance System™), a

non-delayed immediate disconnection

is ensured in the event of an arc fault.

This disconnection is even faster than

that of a non-delayed short-circuit

release..

This function can be activated directly

on the circuit-breaker or via an exter-

nal switch, such as whenmaintenance

personnel enter a hazardous area.

Other components from the ARCON

protective system, in conjunction with

the IZM26 enable arc fault protection

in stages. ARCON on the Internet:

www.moeller.net/arcon

Selection criteria for IZM26

circuit-breakers

Fundamental criteria for the selection

of circuit-breakers:

• Max short-circuit current I

k max

the circuit-breaker’s point of instal-

lation: this value determines the

short-circuit breaking capacity or

the short-circuit current carrying

capacity of the circuit-breaker. It is

compared to the I

, I

and I

values of the circuit-breaker and

determines essentially its size (see

Technical data).

• Rated operational current I

which

should flow through the respective

branch circuit:

This value must not be greater than

the maximum switch rated opera-

tional current of the circuit-breaker.

The rated operational current can

be adjusted down using additional

rated operational current modules.

• Ambient temperature of the circuit-

breaker: This is generally the inter-

nal temperature in the control panel.

Observe the derating values with

increased ambient temperature

(see Technical data).

• Circuit-breaker type: fixed mounted

or withdrawable units, 3 or 4 pole.

• Minimum short-circuit current,

which flows through the switching

device: The release must recognize

this value as a short-circuit and may

react with a trip.

• Protection functions of the circuit-

breaker: This is determined by the

selection of the respective over-

current release.

Documentation

Operating manual

AWB1230-1605de (deutsch)

AWB1230-1605en (english)

CurveSelect characteristics

program

Display tripping characteristics

according to user settings and assess

their interaction effectively: