As of now, the largest miniature circuit breaker (MCB) available in the market typically has a rated current of up to 125A. Companies like Chint offer MCBs that can handle operating currents not exceeding this limit, providing overload and short-circuit protection for various applications【6†source】【7†source】.
However, it's important to note that while MCBs are primarily designed for low-voltage applications, higher capacity circuit breakers, such as molded case circuit breakers (MCCBs) or air circuit breakers (ACBs), are available for larger currents in industrial settings【6†source】. For specific applications, these larger breakers can be more suitable due to their ability to handle higher currents and voltages【7†source】.
For the most accurate and updated information regarding specific products and their ratings, you might want to check with major manufacturers like ABB, Schneider Electric, or Eaton【6†source】【7†source】.