Based on the tripping characteristics of MCB circuit breakers, MCBs are classified into different types according to the tripping within the fault current range. The important types of MCBs are as follows:

B-type MCB, C-type MCB, D-type MCB, K-type MCB, Z-type MCB

The following table lists the trip current and operating time for each type of MCB mentioned above.

Based on the above information, analyze and introduce various types of application scenarios:

1. B-type MCB

This type of MCB trips between 3 and 5 times the full load current.

B-type equipment is mainly used for residential or light commercial applications, where the connected load is mainly lighting fixtures and household appliances are mainly resistive components.

Also used for computers and electronic devices with very low surge loads (PLC wiring). In this case, the surge current level is relatively low.

The function of B-type MCB is to protect and control circuits, prevent overload and short circuit. Protect personnel and long cables in TN and IT systems.

Application scope: residential, commercial, and industrial.

Read more information about B-type MCB

2. C-type MCB

This type of MCB trips between 5 and 10 times the full load current.

This is used in commercial or industrial applications where the short-circuit current in the circuit may be higher.

The load connected to the C-type MCB is essentially inductive (such as induction motors) or fluorescent lamps. Applications include small transformers, lighting, pilot devices, control circuits, and coils.

The function of C-type MCB is to protect and control circuits, prevent overload and short circuit. Resistance and inductance load protection with low surge current.

Application scope: residential, commercial, and industrial.

3. D-type MCB:

This type of MCB trips between 10 and 20 times the full load current.

These MCBs are used for special industrial/commercial applications where current influx may be very high. Examples include transformers or X-ray machines, large wound motors, etc.

The D-curve device is suitable for applications that require high surge currents. High magnetic jump points can prevent annoying tripping in high inductance applications such as motors, transformers, and power supplies.

The function of D-type MCB is to protect and control circuits, prevent overload and short circuit. The protection of circuits (transformers, fault lights) that provide high surge current to the load when the circuit is closed.

Application scope: residential, commercial, and industrial.

4. K-type MCB

This type of MCB trips between 8 and 12 times the full load current. They are suitable for inductive loads and motor loads with high surge currents.

Both K and D curve circuit breakers are designed for motor applications, and during the "start-up" process, the current carrying capacity will rapidly and instantaneously increase.

The function of K-type MCB is to protect and control circuits, such as motors, transformers, and auxiliary circuits, to prevent overload and short circuits.

Advantages of K-type MCB:

In the case of a peak current of up to 8xIn (depending on the series), there will be no interference. Through its highly sensitive constant temperature bimetallic trip, the K-type characteristic can provide protection for vulnerable components within the overcurrent range; It also provides optimal protection for two cables and lines.

Application scope: commercial and industrial.

5. Type Z MCB:

This type of MCB trips at 2 to 3 times the full load current.

These types of MCBs are highly sensitive to short circuits and are used to protect highly sensitive equipment, such as semiconductor devices.

The function of Z-type MCB is to protect and control electronic circuits, prevent weak electricity and long-term overload and short circuit.

Application scope: Commercial and industrial use.

All types of MCBs above provide trip protection within one tenth of a second.

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