Circuit-Breakers and Switch-Disconnectors up to 6300 A

Circuit-Breakers IZM Intelligent and capable of communication

The IZM was the realisation of a circuit-breakers concept that has now become the standard worldwide. The compact circuit-breaker in the rated current range 630 to 6300 A utilises the very latest protective measures and technology which, in many respects, has set the benchmark.

In terms of performance with higher switching capacities; in terms of function through the increased signalling and information features; and in terms of handling through front access to the operating components and in terms of installation through the identical connection positions for fixed or with drawable installation.

The IZM is available in three frame sizes up to 6300 A. Compact frame size 1 from 630 A to 1600 A only requires a 400 mm wide area in the control panel – and that saves space. Frame size 2 covers the wide range from 800 - 3200 A, simplifying both engineering and installation. Frame size 3 covers a range from 4000 A up to 6300 A. The same door cutout fits all breaker sizes.

Each size of IZM is also available as an IN switch-disconnector. Both accessories and operation are identical to those of the IZM circuit-breaker enabling simple retrofitting on site for all versions.

The IZM: crammed with good ideas

With its well thought-out range of features, the IZM has redefined standards:

  • Modular concept: thanks to its limited number of components, IZM is both reliable and flexible in operation, conversion, and expansion.
  • Four versions: basic, normal, high and limiting switching capacity now extend up to 150 kA.
  • Highly durable: the IZM is designed in conditions subject to severe stresses
  • State-of-the-art tripping systems: with its four tripping systems the IZM masters a wide range of different protective tasks
  • Ideally suited for higher-level tasks with its integrated system diagnosis and event protocol.
  • Simple operation – with straightforward installation and adjustment.
  • Reliability by isolating the enclosed stable housing.
  • Optimised fitting volume reduces the number of possible variations and the switchgear assembly is thus standardised as far as possible.
  • Rating plug for extended range of application.

circuit-breakers IZM and MODAN The IZM is used worldwide in the modern power distribution systems, such as MODAN 6000.

Used together with the innovative ARCON® protection system, arcs are quenched within 2 ms before their destructive effects can develop. The IZM reliably disconnects the short-circuit current.