What is the current rating of the company fuse (or MCB)?

Hint: In order to answer this question, first we will explain the current rating of the company fuse or the MCB and then we will discuss the MCB and the working mechanism and also its uses.

Complete answer:
MCB is more sensitive to current than fuse. It detects any abnormality in the current flow and automatically switches off the electric circuit. In case of MCB, the faulty zone of the electrical circuit can be easily identified by faulty circuit trips to the off.

Fuses interrupt current flow more quickly, but they must be replaced if a piece of metal melts down there, whereas circuit breakers can be reset and used several times. The operational mechanism is the most important distinction between a fuse and a circuit breaker.

When fuses have done their duty in the past, they should be replaced by MCBs for better safety and control. An MCB, unlike a fuse, functions as an automatic switch that opens in the event of excessive current flowing through the circuit and can be reclosed without the need for manual replacement once the circuit has returned to normal.

In the majority of circuits, MCBs are used as a substitute for the fuse switch. As a reliable means of protection, a wide variety of MCBs with breaking capacities ranging from \[10kA{\text{ }}to{\text{ }}16kA\] are presently in use in all areas of household, commercial, and industrial applications.

Note: MCB, is a switch that automatically opens and closes in response to the current flowing through the circuit. An insulating substance surrounds this electromagnetic gadget. It is mostly used in residential and industrial circuits as an alternative to a fuse switch to protect against current overload.