The Case-IH 139718A1 is a genuine OEM protective switch, designed to provide essential electrical circuit protection for a wide range of Case-IH agricultural and construction machinery. This 12V, 20A switch ensures reliable operation and safeguards critical components. It is a direct replacement part for numerous Maxxum, Puma, Farmall, Optum, Magnum tractors, and Axial-Flow combines, maintaining the original equipment's performance and safety standards.