SRN5420K is a type of molded case circuit breaker manufactured by ABB. It is a mid-range device designed to protect medium voltage industrial applications such as transformers, motor circuits and all low voltage switchgear applications. It is a cost-effective, compact and reliable circuit breaker offering enhanced safety features, adjustable settings and overload protection. Additionally, it offers several advanced features such as Undervoltage trip, Overvoltage trip, Manual Reset, Louver Ventilation System, Adjustable Tripping Time, Adjustable Short Circuit Current Trip, Adjustable Trip Setting and reinforced insulation. The SRN5420K conforming to IEC 60947-2 standards is available in sizes ranging from 160A up to 800A.