Select Language

Miniature circuit breakers (MCBs)

Uncompromising safety and comfort

Miniature Circuit Breakers (MCBs) ensure electrical safety in homes, offices and other buildings as well as for industrial applications by protecting electrical installations against overloads and short-circuits. Once a fault is detected, the MCB automatically switches off the electrical circuit to prevent damage to wires and to avoid the risk of fire. MCBs are equipped with two tripping mechanisms: the delayed thermal tripping mechanism for overload protection and the magnetic tripping mechanism for short circuit protection.

For 100 years, we have continued to innovate MCBs and expand our product line to meet the demands of various applications and markets. Our products are compliant with global product standards such as IEC, UL and CSA. This established and certified portfolio is designed to provide maximum safety for buildings, assets and infrastructure.

Compliant to worldwide product standards (IEC, UL, CSA)
Characteristics: B, C, D, K, Z
Configurations: 1P, 1P+N, 2P, 3P, 3P+N, 4P
Breaking capacities up to 25 kA
Rated currents up to 100 A

Highlights

Wide range

Extra-wide and complete range of MCBs to cover most applications and markets

Certified quality

Compliance to worldwide product standards (IEC, UL, CSA)

Compact

Space and time saving thanks to the unique bottom-fixing auxiliary contact

Product ranges

IEC certified MCBs

General applications

1P+N in one module

Compact MCBs

Easy connect technology

S300 P

Industrial applications

M300 P

Industrial applications

UL certified MCBs

S200 M UC range

DC applications

SU200 range

UL & CSA applications

MCBs for special applications

S200 MT range

Rail applications

S200 MTR range

Rail applications

S300 P

Railway applications

Accessories

Busbars, shunt trips, auxiliary contacts, etc.

Applications

Residential buildings

Motors & Transformer protection

Semi-conductor circuits protection

Protection of PV applications

Protection devices for USA & Canada

Transportation

Besides industrial and commercial applications MCBs are also installed in residential buildings. Thanks to IEC 60898-1 they can be handled even by unskilled people.
(S200, S200 M, SN200)

The K-type characteristic assures best protection and control for circuits like motors, transformer and auxiliary in order to protect damageable elements in the overcurrent range as well as cables and lines and stands out through noiseless tripping. The S200 and S200 M are worldwide approved as they meet all international standards.

Semi-conductors, equal devices and auxiliary circuits receive control and best protection against overloads and short-circuits exceptionally fast tripping. The Z-type characteristic protects damageable elements in the overcurrent range.
(S200 Z, S200 M Z, S200 P Z)

The high performance universal current MCBs and PV products have been designed especially for PV applications. They ensure best protection and control of photovoltaic strings against overloads and short-circuits. In combination with remote switching and control devices they are an ideal alternative for fuses due to comfortable string failure identification and signalization.
(S200 M UC, S802 PV S)

One solution for all applications even meeting North American and Canadian standards. Thus, the devices can be used as global circuit breakers for OEMs, building global equipment.
(SU200 M, S200 U, S200 UP, SU200 MR)

Marine applications

Our offering also includes MCBs that suit marine applications as they have a high breaking capacity, can be used at 440V and are certified by all major ship registers.
They are available in all characteristics to meet the special requirements properly.
(S200, S200 M, S200 M UC, S200 P)

Rail applications

ABB’s DIN-Rail modular devices meet the highest possible safety standards, therefore they also comply with the specific standards of the railway sector such as fire protection, resistance to shock and vibrations and fire and smoke protection standards.
(S200 MT, S200 MT UC, S200 M UC, S200 P, S800S, S800S UC)

Electric Vehicle Infrastructure

Overcurrent protection is also required for EV charging solutions.
Our S200 MCBs have a wide range of breaking capacities suiting EV charging stations with different amounts of kW AC and different numbers of phases.

Quick selection charts

Household applications

Industrial applications

UL applications

Documentation

Catalog

Miniature circuit breakers

Learn more about

Youtube video

Line protection with ABB MCBs

Complex technology in the miniature circuit breaker

Infographic

ABB expert knowledge is not only needed for devices that switch high currents and voltages, but also for the more commonly used miniature circuit breaker – a sophisticated piece of engineering.

How Germany’s Hockenheimring uses ABB circuit breakers to help power world class events

Success story

The Hockenheimring in Germany is traditionally a motorsports race track, known mostly for its world-class events such as Formula One or the German Touring Masters (DTM).

Uncompromising safety and comfort

In 1923, Hugo Stotz made history. He invented a new and innovative circuit breaker that would revolutionize the world of electrical installation and safety.

ABB in Duztech's suppression machines

Success story

What are some of the dirtiest places to work at? Demolition areas, mines, or excavation sites? These types of construction sites all stir up big clouds of dust that no one wants or should have to breathe in.

Youtube Video

Miniature circuit breaker clearing downstream fault

The miniature circuit breaker’s 90th anniversary - Company history

Article

ABB celebrates the miniature circuit breaker’s 90th anniversary. The invention, patented in Germany in November 1924 by Hugo Stotz and his chief engineer, Heinrich Schachtner, made the rapidly increasing electrification of private homes safer and more efficient.