Chint Moulded Case Circuit Breaker 3 Pole (NXM-250 S) 200,250 Amp


  • This moulded case circuit breaker (MCCB) is a type of electrical protection device that is used to protect the electrical circuit from excessive current, which can cause overload or short circuit.
  • With a current rating of up to 2500A,
  • MCCBs are used mostly in industrial areas on high voltage and heavy duty machinery.
  • These breakers are used instead of miniature circuit breakers (MCBs) in large scale PV systems for system isolation and protection purposes.
  • The MCCB uses a temperature sensitive device (the thermal element) with a current sensitive electromagnetic device (the magnetic element) to provide the trip mechanism for protection and isolation purposes.
  • This enables the MCCB to provide:
    • Overload Protection,
    • Electrical Fault Protection against short circuit currents, and
    • Electrical Switch for disconnection.


This formed case electrical switch (MCCB) is a sort of electrical insurance gadget that is utilized to shield the electrical circuit from inordinate flow, which can cause over-burden or short out.
With an ongoing rating of up to 2500A,
MCCBs are utilized for the most part in modern regions on high voltage and hard core apparatus.
These breakers are utilized rather than small circuit breakers (MCBs) in enormous scope PV frameworks for framework disengagement and security purposes.
The MCCB utilizes a temperature delicate gadget (the warm component) with an ongoing touchy electromagnetic gadget (the attractive component) to give the outing instrument to security and disengagement inspirations.
This empowers the MCCB to give:
Over-burden Assurance,
Electrical Issue Assurance against cut off, and
Electrical Switch for disengagement.
MCCBs in an electrical circuit ought to be measured by the circuits anticipated working flow and conceivable issue flows.
The three principal standards while choosing MCCBs are:
The appraised working voltage (Ue) of the MCCB ought to be like the framework voltage.
The excursion worth of the MCCB ought to be changed by the ongoing drawn by the heap.
The breaking limit of the MCCB should be higher than the hypothetical conceivable issue flows.
Motivation behind trip Button
This test is led by testing the reaction of the MCCB under reproduced over-current and shortcoming conditions.
Warm security of the MCCB is tried by running an enormous current through the MCCB (300% of evaluated esteem).
Assuming the breaker neglects to trip, it means that disappointment of warm assurance.
The test for attractive insurance is directed by running short beats of exceptionally high current.
Under typical circumstances, attractive assurance is moment.
This test ought to be directed at the end as high flows increment the temperature of contacts and protection, and this might modify the aftereffects of other two tests.


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