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Molded Case Circuit Breakers (MCCBs) are protective devices used to interrupt and protect electrical circuits from overcurrent and short-circuits. MCCBs are electrical devices that can be used to protect a wide range of electrical systems and equipment.

They are commonly used in low and medium-voltage applications and can handle higher levels of current than Miniature Circuit Breakers (MCBs). MCCBs typically have a rated current of 10 amps to 2,500 amps, and a breaking capacity of up to 200 kA.

### How does an MCCB work?

An MCCB consists of a current-carrying bimetallic strip, a magnetic trip element, and a mechanical latching mechanism. When the current flowing through the MCCB exceeds the set limit, the bimetallic strip heats up and bends, causing the latch to release and trip the breaker. The magnetic trip element senses the magnetic field produced by a high fault current and trips the breaker.

### Difference between an MCB and an MCCB

MCBs are miniature circuit breakers designed to protect low-current circuits up to 125 amps. They typically have a breaking capacity of up to 10 kA and are designed to trip quickly in the event of a short circuit or overload. MCBs are commonly used in residential and commercial buildings to protect individual circuits, such as lighting and power circuits.

MCCBs, on the other hand, are designed to handle higher levels of current (depending on which current rating you buy) and can protect larger electrical systems and equipment. They have a higher breaking capacity than MCBs.

### Typical applications

MCCBs are commonly used in a wide range of applications, including:

- Industrial plants: MCCBs are used to protect motors, transformers, and other equipment in industrial plants.
- Data centres: MCCBs are used to protect power distribution systems in data centres.
- Commercial buildings: MCCBs are used to protect lighting and power circuits in commercial buildings.
- Hospitals: MCCBs are used to protect critical equipment in hospitals, such as MRI machines and X-ray machines.


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MCCBs | Moulded Case Circuit Breakers | RS

MCCBs

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Schneider MCCB | RS | Schneider Electric MCCBs

<p>Browse our incredible range of Schneider Electric MCCBs and ensure superior protection for your electrical circuits. Schneider Electric offer the largest selection of circuit breakers in the industry to ensure that you can find the perfect solution for any application.</p><h2>How do MCCBs work?</h2><p>Moulded Case Circuit Breakers (MCCBs) are safety devices which protect electrical circuits from damage due to overloads and short circuits. They do this by interrupting the circuit when tripped by overcurrent. They can also be used to switch circuits. An MCCB can be reset either manually or automatically to continue normal operation.</p><p>MCCBs are better suited for fault detection with high-power equipment than MCBs as they can provide up to 2500 amps and have an interrupting rating up to 200,000 amps. This makes them ideal for use in commercial and industrial environments.</p><p>The new generation ComPact NSX and NSXm ranges by Schneider Electric feature wireless connectivity capabilities alongside an attractive new signature design. They provide an estimated 40% reduction in wiring time and allow simplified installation due to the new front-plate design. A toggle ensures easier manual operation. The ComPact NSXm models also feature a space-saving small frame size to allow reduced resource consumption. These MCCBS ensure world-class reliability and circuit protection even in highly demanding installations.</p><p>Schneider Electric’s portfolio of high-quality and versatile MCCBs at RS are designed to give you the performance you deserve, and a solution you can trust. They are also leading the way in providing more sustainable and energy efficient products by improving the resource efficiency of the product lifecycle, so look out for their Green Premium label!</p>

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Eaton MCCBs | RS

<p>For superior protection for your circuits and a safer working environment, choose an MCCB from Eaton here at RS.</p><h2>What's an MCCB?</h2><p>Moulded Case Circuit Breakers, also called MCCBs, are a type of electrically operated switch which defends an electrical circuit against overcurrent damage, such as from a short-circuit event or overload. How do they do this? Well, when an electrical fault occurs the MCCB interrupts the flow of current. You can then reset the unit once the fault has been rectified.</p><h3>What's the difference between an MCB and an MCCB?</h3><p>MCBs are rated under 100 amps with an interrupting rating of under 18,000 amps and are largely used for low-energy requirements. An MCCB would typically provide amps as high as 2500 or as low as 10, depending on the application. The interrupting rating of MCCBs ranges from around 10,000 amps to 200,000 amps. An MCCB is therefore more suited for high-power applications.</p><p>Eaton's offer includes the NZM1 and NZM2 series MCCBs, from the digital NZM range of compact circuit breakers for energy distribution systems. The Eaton NZM1 and NZM2 models come with advanced features such as thermal-magnetic tripping technology, adjustable time selectivity, predictive maintenance, and earth fault protection. Some versions also come with on-board diagnostics and data logging, so you can monitor circuits without adding extra hardware. These helpful circuit breakers are designed for universal use, making them a versatile option for many applications such as small distribution boards, machine controls, motor-starter combinations, and even large power management systems.</p>

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ABB MCCBs | RS

ABB MCCBs – also known as moulded case circuit breakers – provide reliable protection for low-voltage electrical systems by interrupting the electrical circuits from overcurrent and short-circuits. Protect your electrical systems with the extensive ABB range of MCCBs.<h2>How does an MCCB work?</h2>An MCCB typically contains two main mechanisms: thermal and electromagnetic.<h3>Electromagnetic Tripping</h3>If there is a high overcurrent or short-circuit, the electromagnetic trip mechanism within the MCCB generate a magnetic field that is proportional to the current that passes through the breaker. As a result, the contacts rapidly open and disconnect the circuit, stopping the current flow.<h3>Thermal Tripping</h3>In the event of overloads, the thermal trip mechanism responds to the heat that is caused by excessive current flow. The thermal element, or bimetallic strip, within the MCCB heats up because of the current passing through. Once the temperature reaches the predetermined threshold, the strip deforms, further activating the trip mechanism which opens the contacts and interrupts the circuit.<p>MCCBs can be manually reset to restore the power within the circuit, or automatically rest if it features automatic mechanisms.</p><h2>What is the difference between an MCB and an MCCB?</h2>MCBs are miniature circuit breakers which tend to have lower breaking capabilities, where they effectively interrupt low to moderate faults in current, typically found in light commercial or residential applications.  Whereas MCCBs have higher breaking capabilities as they are designed to interrupt higher levels of current (dependent upon current rating). This means that MCCBs are associated more with larger industrial installation and electrical systems. <h2>Applications</h2>ABB MCCBs can be used in a wide range of applications, including:<ul><li>Power distribution systems</li><li>Mining operations</li><li>Industrial plants</li><li>Marine applications </li><li>Data centres</li><li>HVAC systems</li><li>Commercial buildings</li><li>Railway and transportation systems </li><li>Hospital machinery</li></ul>

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