ABB OS30AJ12 is a 3‑pole thermal overload protection relay designed to be paired with ABB OS‑series disconnect switches for 3‑phase motor circuits. It is rated for 480 V systems with a 30 A overload protection setting and a short‑circuit rating up to 200 kA in the published combination data. Catalog designations and data sheets list OS30AJ12 as a Class J A9 TA25DU1.4 combination, reflecting its role as an integrated overload protection solution in ABB motor‑control assemblies.
