The Onesto KC6-KU-340 is a robust 40-ampere, 3-pole miniature circuit breaker engineered for demanding electrical installations. Rated at 6KA breaking capacity and compliant with IEC60497-2/50Hz standards, this DIN rail-mounted device delivers reliable overcurrent protection across 240V and 415V systems. Its utilization category A classification makes it ideal for both industrial and domestic applications where consistent performance and safety are paramount. The distinctive blue housing ensures easy identification within switchboards, while its compact design maximizes panel space efficiency.