NF2000-S datasheet(4/105 Pages) MITSUBISHI

4 / 105 page

2. FEATURES – Advanced MCCB Design Technol-

ogy & Performance

2.1 Arc-Extinguishing Device – ISTAC

Mitsubishi has developed an epoch-making

ISTAC

technology to realize an improved current-limiting and

breaking performance within a smaller breaking space.

Introduction of

ISTAC technology upgrades the cur-

rent-limiting, selective-breaking, and cascade-break-

ing performance. The maximum peak let-through cur-

rent

Ip decreases to about 80% (compared with

Mitsubishi’s 100AF). The passing energy

I2t de-

creases to about 65% (compared with MItsubishi’s

100AF). The smaller breaking space has led to an

improved function, a smaller size, and a standardiza-

tion of the breakers.

Triple forces accelerating

The triple forces generated by a newly designed cur-

rent pass and the Vapor Jet Control (VJC) insulat-

ing materials which makes up a slot-type breaking

construction accelerate the movable conductor, and

separate the contacts faster than ever before in short-

breaking.

Electromagnetic attractive force which works between

a current of the movable conductor and a current of

the fixed upper conductor.

Electromagnetic repulsive force which works between

a current of the movable conductor and a current of

the fixed lower conductor.

Pressure which works on the movable conductor by

gas generated in the slot.

Lower,

fixed-contact

conductor

Repulsive

force

Movable

contact

Attractive

force

Current A

Current

Current B

Current C

Upper,

fixed-contact

conductor

Arc control by slot-breaking

The VJC of the fixed contact incorporates newly de-

veloped insulation made of ceramic fiber and metal

hydroxide. The substantially improves the VJC effect.

The arc-extinguishing gas energies to improve the

capability of extinguishing the arc.

The VJC suppresses the emergence of carbide prod-

ucts in breaking a current and contribute to the recov-

ery of insulation immediately thereafter.

The VJCs on the fixed and movable contacts work

together to forcefully reduce the arc spot and rapidly

contract the total arc being extinguished.

Fixed contact

VJC

Upper,

fixed-contact

conductor

Lower,

fixed-contact

conductor

Pressure

Arc

Movable contact

Movable

contact VJC

Vapor jet control (VJC)

Vapor Jet Controllers made of insulating material are

arranged around the contacts where they control the

arc as follows:

1. The arc spot is forcibly reduced by the arrange-

ment of the insulating material.

2. The arc column is contracted.

3. Adiabatic expansion cools the arc.

4. The arc is transferred at the optimum moment to

the arc-extinguishing chamber by the arrangement

of the Vapor Jet Controllers.

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