MCB is an electro-mechanical device which protects the electrical circuit in case of overload and short circuit faults. MCB detects the fault condition and automatically switch off to interrupt the circuit current and it can be manually switched ON after removing the fault.
What does an MCB protect?
MCBs or Miniature Circuit Breakers are intended to give protection against overloads and short circuits, which can cause damage to cables and equipment. MCBs have current ratings (6A, 10A etc.) above which they will start to open or trip and give protection to the equipment.
Is MCB a protective device?
MCBs are electromechanical devices which are used to protect an electrical circuit from an overcurrent. It can be reclosed without any hand-operated restoration. MCB is used as an option to the fuse switch in most of the circuits.
Which series MCB used for protection of motor?
C-curve MCB: Designed to protect general electrical distribution circuits from short circuits and overloads. D-curve MCB: Designed specifically to protect inductive circuits, including motors.
Which is better RCCB or MCB?
RCCB stands for Residual Current Circuit Breaker. … It is the safest device to detect and trip against electrical leakage currents, thus ensure protection against electric shock caused by direct contacts. RCCB is generally used in series with an MCB which protects them from over current and short circuit current.
What causes a MCB to trip?
The overloading of a circuit is a major reason leading to frequent short-circuit tripping. A circuit breaker trips if it is attempting to draw more power than it is intended to carry. … Heavy power appliances on the same circuit generally lead to a situation of excessive electricity consumption, creating an overload.
How many times can a MCB trip?
MCBs with this class characteristics trips instantaneously whenever the current flowing through it rates between 10.1 to 20 times its rated current.
Does an MCB provide overcurrent protection?
Miniature Circuit Breakers (MCB) MCBs provide overcurrent and short-circuit protection only and are unable to detect residual current (earth leakage current) unless it is large enough to be classed as an overload or short circuit.
How do you protect a circuit from overload?
Overcurrent protection devices such as fuses, breakers, and others limit the current to the proper rate and disconnect short circuits. The type of overcurrent protection system used and the maximum current passing through the circuit components determine the size of the overcurrent protection system.