MCB or MCCB? How to Choose

With regards to the discussion about MCB vs. MCCB, miniature circuit breakers are designed for smaller circuits at home and in your commercial establishments, while molded case circuit breakers are crafted for higher-voltage industries where protection against the perilous short circuit protection is a must. 

Learn more about these circuit breakers and their key differences in this guide that will cover the following:

– What are MCBs and MCCBs?

– MCB vs. MCCB: Key differences

– When to use MCBs and MCCBs

– Meet SIMPLYBUY, a renowned supplier of electronic MCCB

iC65 MCB

Manufacturer: Schneider Electric
Model: iC65
Type: MCB
Relay application: 1~63A
Product compatibility: Part of 9 Series

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What is a Miniature Circuit or MCB Breaker?

Let’s start the conversation on what is MCB and MCCB with the first one, the miniature circuit breaker. These breakers are electrical switches automatically switching off electrical circuits in the event of abnormal conditions of your network, such as faulty conditions. Today, MCBs are used in low-voltage electrical networks in exchange of fuses. 

MCBs trip by displacing a latch point in case of short circuits. This releases a spring, separating the moving and fixed contacts, which could produce arcs. Arcs are then directed to arc splitters and quenched. Through resetting the latch, the MCB is restored for further operations, ensuring safety in your industry.

Some of the ratings for MCBs include the following:

• Rated current (In)
• Breaking capacity (Icu)
• Rated voltage (Ue)
• Number of poles
• Trapping characteristics
• IP protection rating
• Ambient temperature

What is a Molded Case Circuit or MCCB Breaker?

On the other hand, molded case circuit breakers, or MCCBs, are likewise safety devices utilized to protect electrical circuits from problems. 

They work by cutting off the power supply automatically when faulty or overcurrent situations occur, therefore preventing any form of damage to electrical systems. MCCBs can be implemented for both low-voltage and high-voltage systems.

Apart from offering protection versus faults, they also provide circuit isolution throughout maintenance. MCCBs are usually installed in distribution panels, providing a visible indication that let you know when the power is turned off.

Some of the ratings of MCCBs are:

• Rated current (In)
• Rated frame current (Inm)
• Rated insulation voltage (Ui)
• Rated working voltage (Ue)
• Operating short-circuit breaking capacity (lcs)
• Mechanical life
• Electrical life

MCB vs. MCCB: Key Differences

Here, you will learn the difference between MCB and MCCB. 

Breaking Capacity

Breaking capacities are the maximum amount of fault current your circuit breaker can trip without causing damage. Unlike MCBs, MCCBs are known for their higher breaking capacities. They can interrupt currents up to 100 kA, while MCBs can do the same thing, but at 10 kA or less. In conclusion, MCCBs are more suitable for applications with high breaking capacity.

Ampere Range

The primary distinction between MCBs and MCCBs in terms of this is their capacity. The former is designed for circuits are lower currents, so they are best for residential or light commercial applications. 

In contrast, MCCBs are capable of handling higher electrical currents, with really higher ratings, making them ideal for high-performing industries and high-power systems.

Trip Adjustment 

The main advantage of both MCCBs and MCBs is their adjustable trip settings. MCCBs allow individual adjustments of the trip current and time delay for more efficient protection of your electrical systems and equipment. However, in contrast, MCBs have a fixed trip settings designed to trip at specific current values.

Size

The two differ in size, with MCBs being tinier and more compact, perfect for use in low- to medium-current applications in residential and light commercial settings.

On the other hand, MCCBs are bigger and designed for higher current ratings and industrial settings where higher fault handling is crucial, but spaces are less constrained.

Cost

Cost is relative. Traditionally, MCCBs tend to be more expensive than MCBs because of their size, functionality, and applications. MCCBs basically have higher capacities and adjustable trip settings, while MCBs are capable of protecting small electrical systems and equipment. However, you can definitely find a supplier of electronic MCCB that offer the equipment at a lower price. 

When to Use MCBs and MCCBs

The best applications of MCBs are:

• Residential wiring
• Light commercial buildings
• Industrial panels
• Heater and cooker circuits
• Sensitive electronics

Meanwhile, MCCBs are ideally used for the following:

• Industrial equipment protection
• Electric feeders
• Generator protection
• Welding machines
• Capacitor banks and power factor correction

Schneider Electric PowerPacT H-Frame HDA36100

Rated Current: 100 A (thermal-magnetic, 80% continuous rating)
Poles: 3P (ABC phase connection)
Rated Voltage: 600 V AC / 250 V DC
Breaking Capacity (IEC 60947-2):
• 25 kA @ 240 V AC
• 18 kA @ 480 V AC
• 14 kA @ 600 V AC
• 20 kA @ 250/500 V DC

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Sourcing Your Equipment From the Right MCB and MCCB Suppliers

To conclude, both MCCBs and MCBs play a vital role in protecting circuits from faults, such as short-circuiting. Though they are similar in this regard, they differ in applications.

MCCBs are suitable for large electrical systems that require high current ranges, while MCBs are best for protecting smaller electrical systems and equipment, as well as are cheaper. 

To know the key differences between the two will enable you to choose the right circuit breaker for your industry. This way, your electrical systems remain safe and efficient. 

Are you looking for a top-notch quality supplier of electronic MCCB? Look no further than at SIMPLYBUY.

Since our beginnings in the 2010s, we have worked hard to drastically enhance our solutions for industrial control equipment and automation. Today, we connect businesses to approximately 100 brands and over 300 suppliers globally. We have also carved a worldwide leadership that other companies like us look up to. 

As your AC MCCB suppliers in China, as well as DC MCCB suppliers in China, and the rest of the world, SIMPLYBUY offers the following bestselling product models in our catalog: iC65, HDA36100, and NXB-63. 

We also supply motor controls, VFDs, PLC modules, relays, and sensors, partnering with renowned brands, such as Schneider Electric, ABB, and so much more. Talk to us today to learn more.