The MHOR04 is a line differential and protection relay that is beneficial for feeders. This works quickly and is run with the Merz-Price current system in mind. This works for feeders and can manage a single-phase current for managing pilot circuits. This is made with a single-phase current and works for two-core pilots without any problems from how the core works. This unit especially works by using a low intercore insulation setup. This is managed with a good unit protection scheme and can work in ring circuits. This works with three line currents that link together to manage pilot circuits. This is made with the intention of making the system run quickly with a greater fault stability than what other units feature. Four output contracts are also used in this setup.