Miniature Circuit Breakers & Supplementary Protectors

The better choice to safeguard installations against overcurrents

With more than a century of innovation, ABB pioneered resettable miniature circuit breaker (MCB) technology and remains the original leader in this field. Our UL 489 miniature circuit breakers and UL 1077 supplementary protectors provide reliable protection against overcurrents across a wide range of applications. ABB offers one of the industry’s most comprehensive portfolio of miniature circuit breakers.

DIN rail circuit protection offering

ABB's complete line of DIN rail 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 Miniature Circuit Breakers

UL489 MCBs feature two tripping mechanisms, the delayed thermal tripping mechanism and the magnetic tripping mechanism, to ensure electrical safety in multiple applications

UL1077 Miniature Circuit Breakers

UL1077 MCBs feature two tripping mechanisms, the delayed thermal tripping mechanism and the magnetic tripping mechanism, to ensure electrical safety in multiple applications