How to select the right MCB for an electrical circuit? | Axiom
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How to select the right MCB for an electrical circuit?

How to select the right MCB for an electrical circuit

Selecting the suitable Miniature Circuit Breaker (MCB) is crucial for ensuring an electrical circuit’s safety and optimal performance. MCBs play a vital role in protecting electrical systems from overcurrents and short circuits, preventing potential hazards and damage to the circuitry.  

Firstly, understanding the electrical circuit is essential. Take note of the circuit’s voltage rating, current capacity, and frequency. This knowledge will guide you in selecting an MCB that can handle the specific requirements of your circuit.  

Understanding the Electrical Circuit: 

Before choosing an MCB, it is essential to comprehend the specific requirements of your electrical circuit. Different types of loads, such as lighting, motors, and appliances, have varying current demands. Based on the calculated load, you can select the appropriate MCB rating. Manufacturers provide MCBs with different nominal currents (In) and interrupting capacities (Icu). 

Each load has unique characteristics and power requirements. Lighting loads, for example, typically have a stable and continuous power demand. On the other hand, motors and appliances may experience fluctuating power needs due to start-up surges or varying operational conditions. 

To determine the load characteristics: 

  1. Conduct a thorough assessment of the electrical circuit.
  2. Identify the different types of loads connected to the circuit and their power requirements.
  3. Consider factors such as wattage, voltage, and current ratings for each load.

It is essential to consider additional features that might be required based on the specific circuit needs. These features enhance the MCB’s protective capabilities and the electrical system’s overall safety. 


  • Protection of equipment against current as high as 10,000A
  • Offers clear identification of faulty circuit with knob coming to mid position
  • Prevents accidental contact with live parts
  • The breathing channels are very profiled that the air leaks around the individual pole, resulting in cooler operation.
  • LOW WATT LOSS leading to ENERGY SAVING as the contacts are made of Silver Inlaid copper, ensuring: 
  1. o Long Life 
  2. o Maximum Safety 
  3. o Low Contact Resistance 
  • Available due to safety purposes during maintenance.
  • OFF POSITION: For Personal Safety
  • ON POSITION: For extremely critical load Restriction
  • In the possibility of an overcurrent or short circuit, the MCB automatically interrupts all the poles even if the MCB knob is held in the ON position.
  • Axiom MCB is designed to allow minimum let-through energy in case of fault. It operates with the high-speed mechanism in which the heavy current sets up electrodynamic forces due to short-circuit, separating the contacts several times faster before reaching the peak volume, thus suppressing the high current.

For more TECHNICAL SPECIFICATIONS, you can visit:

Axiom Controls is a manufacturer of LV Switchgear Products including – MCB, MCCB, RCCB, Isolators, Distribution Boards, and Two way center off changeover switch. We are looking for Dealers/ Distributors/ Channel partners. Fill out the inquiry form if you are interested.

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