In the top-level architecture of low-voltage distribution systems, the 630 A current rating is directly linked to the safe operation of the transformer's low-voltage main outgoing line and the primary distribution busbar, making it one of the most critical current nodes in the entire power supply network. The OFA-M1 series OFM-630/3300 molded case circuit breaker, with a frame rated current of 630 A, a rated ultimate short-circuit breaking capacity as high as 50 kA, a service breaking capacity of 35 kA, and a rated insulation voltage of 690 V, provides reliable backup support for the main outgoing lines of industrial transformers, distribution centers of large buildings, and the main power circuits of critical infrastructure with flagship-level electrical protection performance. The product strictly complies with the GB/T 14048.2 standard, representing the highest level of this series in terms of carrying capacity and breaking capacity.