Miniature Circuit Breakers (MCB)

Your safety always comes first, miniature circuit breakers (MCBs) will protect electrical installations from overloads and short circuits, ensuring safety anywhere.

Miniature circuit breakers, equipped with 2 tripping mechanisms for overload and short circuit protection, help ensure no fire hazards whilst also protecting wires once a fault is detected. 

MCBs have three common types for circuit protection in residential, commercial, and industrial applications. The use is classified by a type, which determines the tripping characteristics of the MCB:

Type B – trips between 3 and 5 times the load current

• This type will trip instantly at a rate of three to five times its rated current. These are normally used for resistive or small inductive loads where switching surges are very small. Therefore, these are suitable for residential or light commercial installations.

Type C – trips between 5 and 10 times the full load current

• This type will trip instantly at a rate of five to ten times its rated current. These are normally used for high inductive loads where switching surges are high such as small motors and fluorescent lighting. In such cases, type C MCBs are preferred to handle higher values of short circuit currents. Therefore, these are suitable for highly inductive commercial and industrial installations.

Type D – trips between 10 and 20 times the full load current

• This type will trip instantly at a rate of ten to twenty-five times its rated current. These are normally used for very high inductive loads where high inrush current is very frequent. These are suitable for specific industrial and commercial applications. The common examples of such applications include x-ray machines, UPS systems, industrial welding equipment, large winding motors, etc.