1MS103 is a motor starter from Marathon Electric, a global manufacturer of electric motors and components. The 1MS103 is a complete motor starter package that includes a starter, overload relay, and enclosure. It is a 3-phase, NEMA1 enclosure, enclosed starter for use on motors up to 15 HP. The 1MS103 has a compact design, is capable of up to 45 A of current, and offers protection for both motor and overloads. The overload protection features manual restart, motor thermal protection, short circuit overload protection and quick overload trip setting. The 1MS103 also features an adjustable overload and is UL-recognized and CSA-certified.