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MCBs, or Miniature Circuit Breakers, are electrical devices designed to protect an electrical circuit from damage caused by overcurrent. They serve as a crucial component in the electrical distribution system of buildings, homes, and industrial facilities. You can learn more in our [MCB guide](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/mcb-guide).

RS offer a comprehensive selection of high-quality Miniature Circuit Breakers from industry-leading brands including ABB, Siemens, Schneider Electric, Eaton, Rockwell Automation and Lovato.

### How does a miniature circuit breaker work?

MCBs automatically disconnect the electrical circuit when they detect a current exceeding the rated capacity of the circuit. This action helps prevent overheating and potential damage to the wiring, appliances, or other connected devices.

### What are the different types of circuit breakers?

MCBs come in different types, including Type B, C, and D, each designed to trip at different levels of overcurrent. The choice of MCB type depends on the specific characteristics of the electrical load it is protecting.

- **Type B**: General purpose, suitable for domestic installations. Trips between 3 and 5 times the load current.
- **Type C**: Designed for applications with higher inrush currents, such as motors and transformers. Trips between 5 and 10 times the full load current.
- **Type D**: Intended for circuits with significant inrush currents, like those associated with high-powered equipment. Trips between 10 and 20 times the full load current.

### What is the tripping mechanism of an MCB?

MCBs typically use thermal and magnetic tripping mechanisms. The thermal component responds to prolonged overcurrent conditions, while the magnetic component reacts to short-circuit currents.

### Where are MCBs installed?

MCBs are installed in distribution boards or consumer units and are often used in conjunction with residual current devices (RCDs) for enhanced electrical safety.

### Can I reset an MCB?

After tripping due to overcurrent, MCBs can usually be reset manually. However, it is crucial to investigate and address the cause of the overcurrent before resetting to avoid potential hazards.

MCBs play a vital role in electrical safety by preventing electrical fires and protecting equipment from damage caused by excessive current. They are an integral part of modern electrical installations, contributing to the overall reliability and safety of electrical systems.



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MCBs | Miniature Circuit Breakers | RS

MCBs

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Schneider Electric | MCBs | RS

Schneider Electric is a market leader with a wealth of experience in design and manufacture of MCBs, Miniature Circuit Breakers, providing industry standard electrical protection and control.MCBs, or miniature circuit breakers, are a type of switch used to automatically turn off electrical circuits during abnormal conditions. MCBs often replace fuses in low voltage electrical circuits as they can be more reliable, much more sensitive and are resettable.MCBs have three common types for circuit protection in residential, commercial and industrial applications. Classified by a type, which determines the tripping characteristics of the MCB:<h2>Type B - trips between 3 and 5 times the load current.</h2>This type will trip instantly at a rate of three to five times its rated current. Normally used for resistive or small inductive loads where switching surges are very small. Suitable for residential or light commercial installations.<h2>Type C - trips between 5 and 10 times the full load current.</h2>This type will trip instantly at a rate of five to ten times its rated current. Normally used for high inductive loads where switching surges are high such as small motors and fluorescent lighting. Type C MCBs are preferred to handle higher value of short circuit currents, suitable for highly inductive commercial and industrial installations.<h2>Type D - trips between 10 and 20 times the full load current.</h2>This type will trip instantly at a rate of ten to twenty-five times its rated current. Normally used for very high inductive loads where high inrush current is very frequent. Suitable for specific industrial and commercial applications.<h2>Why select Schneider Electric MCBs?</h2>Schneider Electric have international experience in the manufacture and development of MCBs for example look at the popular Acti9 Miniature Circuit Breaker range of MCBs. Acti9 iDPN up to 40A overcurrent protection, Acti9 iC60 up to 63A protection, Acti9 C120 up to 125A protection and there are many solutions on offer for equipment protection.Schneider Electric go much further with their range providing solutions for electrical consumer products, RCDs residual current devices, SPDs surge protection units, ADDD arc fault detection devices, fuse holders, switch disconnectors including a range of MCB and RCD accessories.

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Are you looking for a 32 amp breaker for your application? Well, look no further. We offer a comprehensive range of high-quality 32 A miniature circuit breakers from well-known industry-leading brands. Choose from single, double, triple, or four-pole breakers with breaking capacities including 4.5 kA, 5 kA, 15 kA and 20 kA. Our 32 amp MCBs have been designed and tested to the latest standards and are ideal for light industrial, commercial, and domestic applications.Browse our range of 32 amp circuit breakers from brands that include ABB, Schneider Electric, Siemens, Eaton, and Contactum<h3>Features and Benefits</h3><ul><li>Manufactured from top-quality materials</li><li>Durable with robust connections</li><li>Easy wiring</li><li>Fits onto industry-standard DIN Rail</li><li>Type A, Type B, Type C, Type D, Type K or Type Z tripping characteristics</li></ul>

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Looking for a high-quality, reliable MCB? Well, you have come to the right place, here at RS we offer a great selection of MCBs from the industry-leading brand Contactum. Contactum breakers are robust, reliable and are ideal for commercial and domestic applications. Choose from single pole and three pole breakers with current ratings from 6A up to 63A. Tripping Characteristics include Type B, Type C and Type D.<h2>Why choose a Contactum Circuit Breaker?</h2>For over 80 years Contactum has been designing and manufacturing excellent quality MCBs. They pride themselves on being one of the few remaining companies that still manufacture in the UK. All Contactum MCBs have been tested and approved to meet the latest industry standards

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Protect against overloading and short-circuiting with an MCB from Eaton, the global power management experts. Here at RS we have a comprehensive array of Eaton MCBs for you to pick from, so you can find the right solution to safeguard your electrical circuits.<h2>What is an MCB?</h2>A Miniature Circuit Breaker (MCB) is an electrical device which automatically protects your electrical circuits from overcurrent. They are a type of switch, and they work by instantly turning off electrical circuits when they detect irregular conditions, such as excess current. This helps to guard against equipment failure or electrical faults.These circuit-breaking components are commonly used in many kinds of commercial, industrial, and domestic applications. They are more reliable than fuses, are resettable unlike fuses, and are more sensitive. You can choose from a number of different types available: A, B, C, D, K and Z. These MCB types have different tripping characteristics, also called the 'trip curve'.Eaton's offer includes popular series and ranges such as MEMshield, xEffect, Faz, and xPole. They come with features and benefits such as clear contact position indication, up to 4 poles, thermal/magnetic overcurrent protection, screw terminals, resilient housing to withstand tough conditions, a wide variety of current ratings, long mechanical lifespans, and finger-safe ratings. Many of their MCBs can be mounted via DIN rail, for easy set-up.Eaton provide industry-leading electrical power control systems that are designed to handle the complex and demanding needs of today's fast-changing world, whether that's your home, in the office, or in heavy-duty industrial environments. Choose an Eaton Miniature Circuit Breaker today for safe, high-performance, dependable overcurrent protection.

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iC60h | Schneider | RS Components

Schneider Electric's iC60H Miniature Circuit Breakers (MCBs) are a notable part of their product range, designed to provide efficient and reliable circuit protection in residential, commercial, and industrial settings. This detailed overview explores the distinctive features and benefits of the iC60H MCBs.<h2>Features and Benefits</h2><ul><li>Advanced Protection: The iC60H series is engineered to offer superior protection against overcurrent and short-circuit conditions, safeguarding both the electrical system and connected devices.</li><li>Wide Range of Amperage Ratings: These MCBs come in various amperage ratings, allowing for precise selection based on the specific requirements of different electrical circuits.</li><li>High Breaking Capacity: Schneider's iC60H MCBs boast a high breaking capacity, which ensures that they can handle high fault currents without damage, thereby enhancing system reliability.</li><li>Compatibility with Add-on Modules: The MCBs are compatible with a range of add-on modules like auxiliary contacts, shunt trips, and undervoltage releases, enabling enhanced functionality and flexibility.</li><li>Energy Limitation Class: These circuit breakers belong to a high energy limitation class, ensuring minimal let-through energy in the event of a short circuit, which translates to better equipment protection.</li><li>Easy Installation and Maintenance: Designed for simplicity, the iC60H series features clip-on mounting and easy-to-access terminals, making installation and maintenance straightforward and time-efficient.</li><li>Visi-Trip Indicator: The inclusion of Schneider Electric's Visi-Trip indicator aids in immediate identification of the tripped breaker, facilitating faster diagnostics and minimal downtime.</li><li>Versatile Application: The iC60H MCBs are suitable for a variety of applications, ranging from residential to industrial environments, thanks to their robust design and versatile functionality.</li><li>Regulatory Compliance: These MCBs adhere to international standards, ensuring compliance with safety and performance requirements across global markets.</li><li>Longevity and Durability: Schneider Electric's commitment to quality is evident in the iC60H series, which is built to last and withstand challenging operating conditions, ensuring long-term reliability.</li></ul>The iC60H series represents Schneider Electric's commitment to innovation and safety in electrical protection. With its comprehensive range of features and benefits, the iC60H MCBs are an excellent choice for ensuring the safety and efficiency of electrical installations.

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3 Phase MCBs | Schneider | RS Components

Schneider Electric's 3 Phase Miniature Circuit Breakers (MCBs) are an integral part of modern electrical safety systems, designed to provide efficient and reliable protection in a variety of settings. These MCBs are specifically tailored for three-phase power systems, commonly used in commercial and industrial environments. They are engineered to meet the high demands of power distribution and protection in these settings. This comprehensive overview will delve into the distinctive features and benefits of Schneider Electric's 3 Phase MCBs.<h2>Features and Benefits</h2><ul><li>Enhanced Power Protection: Schneider's 3 Phase MCBs are designed to offer robust protection against overloads and short circuits, ensuring the safety of both the electrical system and the equipment connected to it.</li><li>High Breaking Capacity: These MCBs come with a high breaking capacity, which is crucial for handling high fault levels typical in three-phase systems, thereby enhancing the overall safety and reliability of the electrical installation.</li><li>Wide Range of Applications: The versatility of these MCBs allows for their use in a variety of settings, including commercial buildings, industrial plants, and infrastructure projects.</li><li>Modular Design: The modular design of Schneider's 3 Phase MCBs ensures easy installation and integration into existing electrical systems, making them a flexible solution for both new installations and upgrades.</li><li>Energy Efficiency: These MCBs are designed to minimize energy losses, contributing to improved energy efficiency of the overall system and aiding in reducing operational costs.</li><li>Easy Identification of Faults: The clear and distinct indication of tripped conditions simplifies troubleshooting and reduces downtime, enhancing the efficiency of maintenance operations.</li><li>Compatibility with Accessories: Schneider's 3 Phase MCBs are compatible with a range of accessories, including auxiliary contacts and shunt trips, which extend their functionality and applicability.</li><li>Compliance with International Standards: These MCBs adhere to rigorous international standards, ensuring high levels of safety and performance, and making them suitable for global applications.</li><li>Durable Construction: Built to withstand demanding operational conditions, these MCBs are durable and reliable, ensuring long-term performance with minimal maintenance requirements.</li><li>Compact Size: Despite their powerful capabilities, these MCBs have a compact footprint, optimizing space in electrical panels and facilitating easier installation and maintenance.</li></ul>Schneider Electric's 3 Phase MCBs embody the company's commitment to delivering high-quality, reliable, and efficient electrical protection solutions. Their comprehensive range of features and benefits makes them an excellent choice for safeguarding three-phase electrical systems in diverse applications.

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Acti 9 | Schneider | RS Components

Schneider Electric's Acti 9 Miniature Circuit Breakers (MCBs) are a critical component in modern electrical safety, designed to offer superior protection in residential, commercial, and industrial installations. Renowned for their reliability and efficiency, the Acti 9 range exemplifies Schneider Electric's commitment to innovation in electrical protection. This comprehensive overview highlights the key features and benefits of the Acti 9 MCBs.<h2>Features and Benefits</h2><ul><li>Optimized Safety: The Acti 9 MCBs are designed with a focus on safety, featuring VisiSafe technology for safe operation and maintenance, ensuring protection for both personnel and equipment.</li><li>High Breaking Capacity: These MCBs possess a high breaking capacity, capable of handling significant fault currents, which enhances the safety and reliability of the electrical system.</li><li>Enhanced Diagnostic Features: Equipped with advanced diagnostic features, the Acti 9 range allows for quick identification and resolution of electrical faults, minimizing downtime.</li><li>Energy Efficiency: The Acti 9 series is designed to be energy-efficient, reducing energy loss and contributing to lower electricity costs and a reduced carbon footprint.</li><li>Wide Range of Applications: Versatile and robust, the Acti 9 MCBs are suitable for a diverse range of applications, from residential homes to complex industrial systems.</li><li>Easy Installation: Schneider Electric has ensured that the Acti 9 series is easy to install, with features like clip-on mounting and straightforward terminal access, streamlining the installation process.</li><li>Compatibility with Control Devices: The MCBs are compatible with a range of control and auxiliary devices, enhancing functionality and offering flexible solutions for various applications.</li><li>Compliance with Global Standards: Acti 9 MCBs meet international safety and performance standards, ensuring their reliability and acceptance in global markets.</li><li>Compact Design: The compact and ergonomic design of the Acti 9 MCBs allows for efficient use of space in electrical panels, without compromising on performance.</li><li>Long-Term Durability: Built with high-quality materials and to stringent standards, the Acti 9 range is durable and reliable, ensuring long-term performance and reduced maintenance needs.</li></ul>The Acti 9 MCBs from Schneider Electric represent a blend of cutting-edge technology, safety, and efficiency, making them an ideal choice for modern electrical protection requirements. Their comprehensive feature set and broad application range underscore Schneider Electric's leadership in the field of electrical safety and energy management.

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ABB MCBs | RS

Please browse our extensive range of miniature circuit breakers (MCBs), brought to you by our partner brand and technology giant ABB. ABB's innovative MCBs are manufactured to the highest quality without compromising safety and expertise. The MCBs supplied by ABB ensure electrical safety in domestic buildings, as well as industrial applications, by protecting electrical installations from short circuits and overloads.ABB are global market leaders in the technology field and aim to transform society and industry to achieve a more productive, sustainable future. ABB is a global giant and has a history stretching back more than 130 years. The business succeeds by connecting its software to its electrification, robotics, automation, and motion portfolio. With the ABB name behind them, you can be sure that any purchase from their range of MCBs will be a fantastic investment.<h2>What are some of the benefits of buying an MCB from ABB?</h2><ul><li>ABB MCB's are compact and save space and time thanks to the unique bottom-fixing auxiliary contact</li><li>They are IP20 rated for finger safety</li><li>They promote productivity and time efficiency, with all important data being available right away</li><li>The EAN marking is laser printed on to the device, making identification quick and easy</li><li>A wide range of compatible accessories can be purchased, making an ABB MCB a versatile choice, whatever your specific application need</li><li>An indicator displays contact position and screws are captive to avoid loss</li><li>A twin terminal allows for separate feeding of the conductor and busbar</li></ul><h3>What different types of MCB do ABB supply?</h3>MCBs have various common types for circuit protection in household, industrial and UL applications. The MCB type determines the tripping characteristics of the device:<ul><li>Type A - a type A miniature circuit breaker is highly sensitive and trips instantaneously when the current reaches 2 to 3 times the rated current</li><li>Type B - a type B MCB trips when the current is 3 to 5 times the rated current. Type B miniature circuit breakers are useful for purely resistive loads which have no inductance</li><li>Type C - a type C miniature circuit breaker has an operating time of 0.04 to 5 seconds and operates for a current value of 5 to 10 times the rated current. They are used with inductive loads like fans, transformers and motors</li><li>Type D - a type D MCB is suitable for very high inductive loads, has an operating time of 0.04 to 3 seconds and has a trip current of 10 to 20 times than the rated current</li><li>Type K - a type K MCB is ideal for inductive loads which have a chance of high inrush currents and trip when the current reaches 8 to 12 times the rated current</li><li>Type Z - a type Z miniature circuit breaker operates between 2 to 3 times the rated current and has an operating time of less than 0.1 second</li></ul>An MCB is an intuitive device that can be used to replace fuses in low voltage electrical circuits as they are resettable, more sensitive and more reliable than a fuse. ABB offer a wide range of MCBs to cover most markets and applications. Their products are of certified quality and comply to worldwide product standards (IEC, UL, CSA).

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ABB System M Pro MCB | RS

Please browse our high quality, versatile range of System Pro M Compact MCBs from ABB. The System Pro M Compact range of MCBs are perfect for household and industrial applications and a quick selection can be made for UL applications (UL 489/CSA 22.2 No. 5).The System Pro M Compact range is innovative and progressive and brings new functions, characteristics, and possibilities to ABB's existing MCB range. The wide range of MCBs includes products that are suitable for all applications in commercial installations, as well as residential and industrial settings.<h2>Why choose an MCB from ABB's System Pro M Compact Range?</h2><ul><li>The range offers multiple functionalities including control, programming, switching, protecting, monitoring, and checking</li><li>The devices can be easily integrated into existing installations thanks to their versatile shape and dimensions</li><li>The devices host a bidirectional cylinder-lift terminal which enables synchronised closure of the back and front wiring input</li><li>Installers are kept safe by protection against electric shock, according to EN 41140</li><li>Reliable and clear marking of devices for easy use and installation</li><li>Busbars can be supplied and connected from both the top and bottom of the device</li></ul>ABB are well known for their expertise and outstanding product quality and the System Pro M Compact range is no exception. The range brings something new to the market with advanced and smart solutions that allow easier and safer installations, whilst saving you time and money.

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