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MCB

Miniature Circuit Breakers

Miniature Circuit Breakers (MCB) offer electrical safety by protecting electrical installations against faults such as overloads and short circuits. Protection of end users’ life and property is vital, therefore providing the optimum smart solution for controlling and monitoring electricity energy efficiently is essential. IPD provides you with the Miniature Circuit Breakers (MCB) from ABB With System pro M compact®, where you will find a complete assortment of a wide range of electrical Miniature Circuit Breakers (MCB) to cover most applications and markets.

Our products are compliant to worldwide product standards (IEC, UL, CSA), warranting reliability and safety for people and assets. Our electrical Miniature Circuit Breakers (MCB) range to cater domestic, industrial and commercial applications with three tripping characteristics C, D and K, with tripping curves C and D for AC applications; C and K for DC applications with multiple pole configurations namely, 1P, 1P+N, 2P, 3P, 3P+N, and 4P. Our electrical MCBs come in breaking capacities from 6kA to 50kA with rated currents of up to 125A. We also offer 1000V 4kA MCBs and MCBs for DC applications.

Browse our range of Miniature Circuit Breakers (MCB) below. With our head office based in Sydney, NSW, we also have offices Australia wide in Melbourne, VIC, Perth, WA, Brisbane, QLD, Adelaide, SA, and Hobart, TAS, so you can get the electrical MCBs you need no matter where you’re located. If you would like to find out more information about our products, get in touch with us on 1300 556 601 today.

Frequently Asked Questions

Based on the specifics of the device or installation site, the following factors are needed to be considered during the selection of an MCB. 

  • The tripping or overcurrent characteristics, typically known as their ‘trip curve’? 
  • The breaking capacity which is the maximum current a Miniature Circuit Breaker can interrupt without causing damage or releasing an arc. This rating should ideally match the strength of any surges that might occur in the area of installation. The standard measurement of breaking capacity is kiloamperes (kA) 
  • The number of trippable units or poles 

IPD offers ABB’s System pro M compact® Miniature Circuit Breakers (MCBs) in three tripping characteristics namely C, D and K to cater domestic, industrial and commercial applications. 

Detects and trips the circuit on sinusoidal residual current and on residual pulsating or continuous direct current of either polarity, with moderate inrush currents, suitable for three phase and single phase applications with electronic components. 

They are designed to trip at currents between five and ten times their rated load. Well suited for commercial and industrial purposes and these MCBs are usually used for high inductive loads where switching surges are high such as in fluorescent lighting and small motors. 

Detects and trips the circuit on sinusoidal residual current and on residual pulsating or continuous direct current of either polarity, with high inrush currents, suitable for three phase and single phase applications with electronic components. 

D type MCBs are the least sensitive type, only activating when current surges to between ten and twenty times the recommended maximum. Used for extremely high inductive loads such as motor with high inrush current, Some frequent examples of the application of these devices are found in x-ray machines, UPS systems, large winding motors, and industrial welding equipment. 

Detects and trips the circuit on sinusoidal residual current and on residual pulsating or continuous direct current of either polarity, with high inrush currents and solves the conflict of service continuity in the event of peak currents and rapid disconnection in the event of a short-circuit when compared to C and D. It is used in three phase with electronic components. They are ideally suitable for motors. 

Miniature Circuit Breakers (MCBs) have a general function of protecting electrical installations against faults such as overloads and short circuits, where as Residual Current Devices (RCDs) are especially built in order to provide protection against the frequently fatal risk of electrocution from touching exposed wires or incorrectly earthed cables. Their operation is precisely within electrical circuits to detect faults and disrupt potentially lethal currents. 

They are also known as ground fault circuit interrupters (GFCIs). 

While both of them have similar functions, the electrical fuse which is designed in order to melt and in so doing break a circuit if the current flowing through exceeds a designated limit. Thus MCBs are preferred as they are reliable, work better in lower voltage settings and do not require replacement after use. 

In theory, any component that is compatible with a particular device in terms of technical specifications can be used. Nevertheless mixing brands within the same installation is not recommended as it makes testing less consistent and can invalidate warranties and installation guarantees. 

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