Classes of minarture circuit breakers

Miniature circuit breakers (MCBs) are a type of electrical protection device used to protect electrical circuits from overcurrents and short circuits. There are several classes of MCBs, each with its own set of characteristics and applications. Here are some of the most common classes of MCBs:

  1. Class CC (Curve C): These MCBs have a high sensitivity to overcurrents and are designed to trip quickly in the event of a fault. They are typically used in applications where high levels of protection are required, such as in industrial control panels and motor control centers.
  2. Class CA (Curve A): These MCBs have a moderate sensitivity to overcurrents and are designed to trip in response to moderate levels of fault current. They are commonly used in residential and commercial applications, such as in household electrical panels and small commercial buildings.
  3. Class B: These MCBs have a lower sensitivity to overcurrents than Class CA MCBs and are designed to trip in response to higher levels of fault current. They are typically used in applications where a higher level of fault current is expected, such as in industrial settings.
  4. Class C: These MCBs have an even lower sensitivity to overcurrents than Class B MCBs and are designed to trip in response to very high levels of fault current. They are typically used in applications where extremely high levels of fault current are expected, such as in high-voltage industrial settings.
  5. Class G (G-MCB): These MCBs are designed to provide protection against ground faults and are typically used in applications where there is a risk of ground faults, such as in residential and commercial buildings.
  6. Class H (H-MCB): These MCBs are designed to provide protection against high-speed faults and are typically used in applications where high-speed faults are expected, such as in industrial control panels and motor control centers.
  7. Class J (J-MCB): These MCBs are designed to provide protection against high-current faults and are typically used in applications where high-current faults are expected, such as in industrial settings.
  8. Class K (K-MCB): These MCBs are designed to provide protection against high-voltage faults and are typically used in applications where high-voltage faults are expected, such as in industrial settings.

It's worth noting that the classification of MCBs can vary depending on the manufacturer and the specific application. It's always important to consult the manufacturer's documentation and follow local electrical codes and regulations when selecting and installing MCBs.