Types of MCB box available: Check here

 MCBs, as you may know, are little devices that operate as controlling agents during a power outage. When it detects an overload or a power surge, this device shuts down the electrical system. It is mostly used as a fuse replacement. You can use many types of MCB in your homes and businesses, depending on the nature of the electrical uses.  

A micro circuit breaker, often known as an MCB, is an electromechanical device that protects an electrical circuit. It protects an electrical circuit from harm caused by excessive current. 

MCBs are circuit breakers that trip in the event of an overload or a short circuit. 

Different Types of MCB Based on their Trip Curves 

  1. Type B MCB 

  1. Type C MCB 

  1. Type D MCB 

  1. Type K MCB 

  1. Type Z MCB  

Let us examine the distinctions between each type: 

Type B MCB 

If the current flowing through the B type reaches three to five times the recommended maximum, it will trip. 

Type B MCBs are the most sensitive and are intended for use in domestic and low-voltage commercial situations where current surges are likely to be minor, such as lighting circuits and home wiring. 

People and long-length cables in TN and IT systems are protected by Type B MCBs. 

Type C MCB 

At currents of five to ten times their rated load, C types of trips. They are used in commercial and industrial applications where there is a possibility of increased short circuit currents in the circuit. 

Small electric motors, fans, fluorescent lamps, small transformers, pilot devices, control circuits, coils, and other similar items are good examples. 

Type C MCBs are designed to safeguard resistive and inductive loads with minimal inrush current. 

Type D MCB 

 

The least sensitive MCBs are D type MCBs, which only activate when current exceeds ten to twenty times the maximum recommended value. 

Welding machines, X-ray machines, UPS systems, huge motors, uninterruptible power supply units, and industrial welding equipment are just a few examples. 

Type K MCB 

 
When the current reaches 8 to 12 times the rated current and the operating time is less than 0.1 second, Type K trips. These are used to protect inductive loads from large inrush currents. They are also suitable for motors. 

Type Z MCB 

 

Type Z MCBs are highly sensitive MCBs with an operating duration of less than 0.1 second and a current value of 2 to 3 times the rated current. They're employed with more delicate electronics like semiconductors that are prone to short circuits. 

Types of MCBs based on the number of poles 

  • Single Pole MCB 

  • Double pole MCB 

  • Triple Pole MCB 

  • Three poles with a neutral  

  • Four Poles 

Another approach to categories MCBs is by the number of poles they have, as shown below. 

Single Pole MCB 

 
A single-pole circuit breaker contains only one switch and protects only one phase of the circuit. 

Double pole MCB 

 
The two-pole circuit breaker has two switches and protects both the two-phase and neutral circuits. 

Triple Pole MCB 

 
Three switches make up a three-pole circuit breaker, which also protects the three phases. 

Three poles with a neutral 

 
The three phases of the circuit are protected by three poles and a neutral circuit breaker. There's also a neutral switch on it. 

Four Poles 

 
Four switches, three phases, and a neutral are found in a four-pole MCB. The four poles, however, preserve all phases and the neutral, unlike the three poles with neutral. They're employed in situations where the circuit isn't balanced. 

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