ABB 2CSF204401R1950 F204 A-125/0.03 AP-R Residual Current Circuit Breaker 125A 4 Pole The ABB 2CSF204401R1950 Residual Current Circuit Breaker is a professional electrical protection device designed to enhance safety and reliability in modern power distribution systems. Developed by ABB, a globally recognized leader in electrical technology and automation solutions, this product reflects advanced engineering concepts and a strong commitment to protecting people, equipment,