MCB- (Miniature Circuit Breaker) Short Circuit & Overload Switching Device.
MCCB– (Moulded case Circuit Breaker) Totally insulated Air Circuit Breaker
MPCB– (Motor Protection Circuit Breaker) Short ckt Switching Device for the protection of motors.
RCCB– (Residual Current Circuit Breaker) is a Leakage Current Sensing Device used to protect a Low Voltage Circuit in case of a current flowing through a abnormal path towards earth.
RCBO– Combination of MCB & RCCB.
Overload protection is protecting a motor , a device or a power circuit from increase in the normal sinusoidal current due to increase in mechanical or electrical load. It detects and protect the equipment from external abnormal condition and can be called as mechanical abnormality detector.