11 Years Factory FTKN (KYN28A) -12 Indoor Exchange Metal Armored Withdrawable Switchgear to Tanzania Factories


Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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FTKN (KYN28A) -12 indoor exchange metal armored withdrawable switchgear is the transmission and distribution control of the single bus segmentation system device that is used for receiving and distributing the power.

It is mainly used for power distribution of power plants, small and medium-sized generator transmission, industrial and mining enterprises and also used for accepting and feeding, large high voltage motor starting plants of the secondary substation to control, protect and detect the whole line.

Inventor of miniature circuit breaker.
The miniature circuit breaker was invented by Stotz-Kontakt, a company established in Mannheim, Germany, in 1891
application, although his commercial power distribution system used fuses. Its purpose was to protect lighting circuit wiring from accidental short circuits and overloads. Inside the MCB and its construction.
MCB means is miniature circuit breaker. it is commonly use in low voltage electrical network system instead of fuse. miniature circuit breaker is best if compared to the fuse. Its automatically switches off the electrical appliances during abnormal condition like over load or short circuit condition.
Working Principle of Miniature Circuit Breaker.
In MCB there are two type arrangement of operation. First is due to thermal effect of over current and second is electromagnetic effect of over current.
The thermal operation of MCB is achieved with a bimetallic strip when continuous over current flows through MCB the bimetallic strip is heated and deflects by bending just like in electric iron. deflection of bimetallic strip releases mechanical latch and operate the MCB mechanism to open the miniature circuit breaker contacts.
In case of short circuit condition current rise suddenly. it causes electromechanical displacement of plunger associated with tripping coil or solenoid of MCB. The plunger strikes the trip lever causing immediate release of latch mechanism consequently open the circuit breaker contacts.
There are three type of MCB, one is Type B, second is Type C and third is Type D.
• Type B trips between 3 and 5 time full load current and is generally used for lighting and domestic applications.
• Type C trips between 5 and 10 times full load current and is generally used for industrial and commercial applications.
• Type D trips between 10 and 20 times full load current and is generally used for specialist industrial use with high inrush currents.

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