brands

attributes.Number_of_Poles

attributes.Current_Rating

attributes.Tripping_Characteristics

attributes.Rated_AC_Voltage

attributes.Series

attributes.Breaking_Capacity

attributes.Rated_DC_Voltage

attributes.Range

attributes.Mounting_Style

attributes.Circuit_Breaker_Type

attributes.Length

attributes.Width

attributes.Depth

attributes.Model_Number

attributes.Better_World_Claim

attributes.Better_World_Product

attributes.Better_World_Verification

ABB System Pro M Compact S200M MCB, 3P, 50A Curve D, 400V AC, 15 kA Breaking Capacity

ABB TMAX XT1B MCB, 4P, 160A, 690V AC, 500V DC, 25 kA Breaking Capacity

ABB System Pro M Compact S200M MCB, 2P, 63A Curve D, 400V AC, 125V DC, 15 kA Breaking Capacity

ABB High Performance S800S MCB, 1P, 63A Curve B, 400V AC, 250V DC, 50 kA Breaking Capacity

ABB TMAX XT1B MCB, 3P, 63A, 690V AC, 500V DC, 25 kA Breaking Capacity

ABB High Performance S800S MCB, 1P, 63A Curve C, 400V AC, 250V DC, 50 kA Breaking Capacity


Miniature Circuit Breakers (MCBs) are essential electrical devices designed to protect circuits from damage caused by overcurrent or short circuits. These compact breakers automatically detect and interrupt the flow of excessive current, helping to prevent overheating and potential electrical fires. MCBs are widely used in electrical distribution systems for residential, commercial, and industrial applications. 

## **How Does a Miniature Circuit Breaker Work?**

MCBs work by monitoring the current flowing through an electrical circuit. If the current exceeds the rated capacity, the MCB trips and disconnects the circuit, thereby preventing overheating and damage to wiring, appliances, or other connected devices. This process ensures the protection of both equipment and individuals from potential electrical hazards.

## **Tripping Mechanism of an MCB**

The tripping mechanism of an MCB consists of both thermal and magnetic components. The thermal tripping mechanism operates in response to prolonged overcurrent conditions, using a bimetallic strip that heats up and bends to disconnect the circuit. The magnetic tripping mechanism, on the other hand, reacts instantly to short-circuit currents by creating a magnetic field that moves a latch to break the circuit. This dual approach ensures comprehensive protection against both long-term overloads and sudden short circuits.

## **Types of MCB Circuit Breaker**

### **Type B**

Type B MCBs are general-purpose circuit breakers suitable for domestic installations. They trip between 3 and 5 times the rated current, providing effective protection against typical household electrical faults.

### **Type C**

Type C MCBs are designed for installations with higher inrush currents, such as motors and transformers. They trip between 5 and 10 times the rated current, making them suitable for more demanding electrical environments.

### **Type D**

Type D MCBs are intended for circuits with significant inrush currents, commonly associated with high-powered industrial equipment. They trip between 10 and 20 times the rated current, ensuring reliable protection for heavy machinery and sensitive equipment.

## **Where Are MCBs Installed?**

MCBs are typically installed in distribution boards or consumer units, where they serve as the primary protective devices for individual circuits. They are often used in conjunction with residual current devices (RCDs) for enhanced electrical safety, providing a robust solution for safeguarding electrical systems in homes, offices, and industrial facilities.

## **How to Reset an MCB?**

After tripping due to overcurrent, an MCB can be manually reset by switching it back to the "ON" position. It is crucial, however, to investigate the cause of the overcurrent before resetting to ensure the underlying issue is resolved, preventing further potential hazards.

## **Applications of Miniature Circuit Breakers**
- **Residential Electrical Panels:** MCBs protect household circuits, preventing electrical overloads and safeguarding appliances.
- **Industrial Equipment:** MCBs are used to protect heavy machinery and motor systems from short circuits and overcurrent.
- **Commercial Buildings:** In commercial settings, MCBs ensure reliable electrical distribution and protection across multiple circuits.
- **Data Centres:** MCBs provide critical protection for data centre power supplies, ensuring stable and uninterrupted operation.
- **Lighting Circuits:** MCBs protect lighting systems from faults, contributing to overall safety and longevity of lighting installations.

## **Protect Your Electrical Circuits with Reliable MCBs**

RS New Zealand is your trusted supplier and distributor of premium-quality MCBs from renowned brands like [ABB](https://nz.rs-online.com/web/b/abb/), [Siemens](https://nz.rs-online.com/web/b/siemens/), [Schneider Electric](https://nz.rs-online.com/web/b/schneider-electric/), [Eaton](https://nz.rs-online.com/web/b/eaton/), [Rockwell Automation](https://nz.rs-online.com/web/b/rockwell-automation/) and [Lovato](https://nz.rs-online.com/web/b/lovato/). Whether you're protecting residential circuits or managing industrial applications, our range of miniature circuit breakers ensures optimal safety and reliability. Shop with RS NZ today and keep your electrical systems secure!

## **Ordering & Delivery Information for NZ**

Ordering MCBs from [RS New Zealand](https://nz.rs-online.com/web/) is simple and hassle-free with our online catalogue, making it easy to choose the right product for your application. We provide fast delivery throughout New Zealand, and you can find more information about delivery times and associated fees on our [Delivery Information](https://nz.rs-online.com/web/content/support/all-articles/delivery) page. 



MCBs

Circuit Breakers

Fuses & Circuit Breakers

1228569899

1492797549

1805640584

1872595187

1950438482

2099506070

2911534392

2972144945

3047907070

3089561311

3379516231

3702440375

3893962904

3999174723

4084450865

482906937

573211935

607105215

630592386

1337321341

1713511683

1953764780

215561600

2212326362

245755136

2675376924

2694081498

2854130884

3031041232

3479376779

3537785963

3606191116

3676807775

3694170890

3696367266

3871454867

3980878867

4239710393

730636658

Development Tools & Single Board Computers

Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools

Electronic Components, Power & Connectors

Engineering Materials & Industrial Hardware

Pneumatic Counters, Logic Controllers & Timers

Electronics Cleaners & Protective Coatings

Schneider Electric Acti9 SE10 MCB Mini Circuit Breaker 63A Curve D 10000 A Breaking Capacity

Schneider Electric MCB Mini Circuit Breaker 40A, 240V AC

ABB 25 MS/MO132 MCB Mini Circuit Breaker, 690 V

Schneider Electric Acti9 SE10 MCB Mini Circuit Breaker 25A Curve C 10000 A Breaking Capacity

ABB MCBs

506 Products showing for ABB MCBs

Popular Searches

Related links