The ABB REF601 is a dedicated feeder protection and control relay designed for the protection, control, measurement, and supervision of utility and industrial power systems. As a member of ABB’s renowned Relion® product family, the REF601 provides a compact and robust solution for overcurrent, earth-fault, and thermal overload protection in medium voltage networks. Its user-friendly design and pre-configured functionality ensure straightforward installation, commissioning, and operation, making it an ideal choice for new and retrofit applications requiring reliable and basic feeder protection.