Difference between Submerged Arc Furnace and Electric Arc Furnace

What is the difference between submerged arc furnace and electric arc furnace? The submerged arc furnace is a kind of electric arc furnace.
Submerged Arc Process of Submerged Arc Furnace

Submerged arc process of submerged arc furnace: the main use is to reduce high melting point and high heat absorption iron alloy etc.