• 27/Aug, 2018

Difference between C Curve and B Curve MCB

Electricity is undoubtedly a major component of our life without which it is difficult to lead our modern age lives. The benefits of electricity are many but it has to be constrained or managed in such a way that it causes more benefit than harm to your appliances. Overloading and fluctuation in electric supply can be dangerous to humans as well as to your electrical appliances. To mitigate these risks, installation of miniature circuit breakers or MCB’s as they are commonly called, is necessary. Finolex MCB’s designed with International standards could provide higher breaking points offering protection against overload and short circuit.

One major function of MCB is to protect the electrical circuit from excessive current flow, and short circuits, by tripping. Trip curves of MCB educate us concerning the trip current rating of Miniature Circuit Breakers. In other words, it is the current range at which a miniature circuit breaker trips instantaneously which largely depends on the highest current required or expected during normal operations.

During a short circuit, sudden ascending of electric current, causes electro-mechanical relocation of the plunger related with stumbling loop or solenoid of the MCB. The plunger strikes the trip lever causing it to release the lock instrument, subsequently opening the electrical switch contacts.

Image Source : www.finolex.com

Based on tripping, MCB can be characterised into two major curve types:

1. B-Curve MCB

‘B’ Curve MCB is used for the protection of circuits with equipment that does not cause surge current, like lighting and distribution circuits. So they are, the best fit for residential applications and domestic appliances with mainly Resistive Load.

2. C-Curve MCB

‘C’ Curve MCB is used for the protection of circuits with equipment that cause surge current i.e. low-HP motors used for air-conditioners, small mono block and submersible pumps with mainly Inductive Load.

Image Source : Finolex Estore

The importance of selecting a MCB from reputed manufacturers is vital as it comes with International standards, protecting your domestic circuits from any mishap. Both C-curve and B-curve MCB’s are a primary priority for residential circuits making it an important aspect to be taken care of for the protection of your family. Finolex’s B and C Curve MCB’s are a safe and trusted brand for those looking for the best electrical solutions.

For further information on Finolex’s Miniature Circuit Breakers, read HERE

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