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Miniature Circuit Breakers & Supplementary Protectors

Hugo Stotz made history 100 years ago. As electrical safety became increasingly important with electrification, his invention of the first resettable Miniature Circuit Breaker (MCB), patented in 1924, changed the way we protect our electrical systems.​

In the event of a short circuit or overload, it immediately disconnects the circuit 10 times faster than the blink of an eye and anyone can easily reset it. Today, our innovations continue to protect millions of facilities, equipment, and assets.
 

Increasing performance, flexibility, and safety in the United States

In our modern world, where electricity powers nearly every aspect of our lives, ensuring the safety of individuals and their surroundings is crucial. With lightning-fast responses to short circuits or overloads, MCBs interrupt the current in just 10 milliseconds - 10 times faster than the blink of an eye. When this happens, the breaker is exposed to intense heat ranging from 5,000 degrees to 6,000 degrees Celsius - temperatures capable of melting rocks. Yet, despite that, homeowners now simply flip the switch that has been tripped, and power resumes its flow.

These circuit breakers not only safeguard millions of facilities, machinery, assets, and lives each year but are also ready to maintain their vital role in protecting modern electrical systems for the next century.

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DIN rail circuit protection offering

Since the invention of the first modern MCB, the technology continuously evolved across industrial settings. Today, our complete line of circuit protection, including MCBs, Fuse Holders, RCDs, and SPDs, provide increasingly higher performance, lower carbon footprint, and greater connectivity to make operations safe, smart, and sustainable.

UL489 MCBs feature two tripping mechanisms, the delayed thermal tripping mechanism and the magnetic tripping mechanism, to ensure electrical safety in multiple applications.
UL1077 MCBs feature two tripping mechanisms, the delayed thermal tripping mechanism and the magnetic tripping mechanism, to ensure electrical safety in multiple applications.
E90 is the ideal protection against short-circuits and overloads for a wide range of applications. E90 is designed for quick, flexible, and error-proof installation.
RCDs are the safest device to detect and trip against ground faults, thus ensuring protection against electric shock caused by indirect contacts.