MasterPact MTZbr Circuit breakers to protect lines up to 6300 A, offering advanced digital featuresbr Part of PacT Seriesbr br Future Ready Masterpact MTZ is a comprehensive range of air circuit breakers designed to protect electrical systems from damage caused by overloads, short circuits and equipment ground faults. Masterpact MTZ embeds advanced digital technologies and Micrologic X control units helping to contribute to safety and energy efficiency.