Single phase/three phase heater element circuit for a ceramic fiber heater

摘要

A single phase and three phase heater element circuit for a ceramic fiber heater wherein a plurality of blocks each of which is formed by a plurality of heater elements arranged side by side on a base of insulation material and connected to one another to form a series circuit, said series circuit being connected across an electric power source, and adjacent ends of the series circuits in adjacent blocks being connected to the same terminal of said electric power source. By connecting adjacent ends of adjacent blocks of ceramic fiber heater element circuits together, the ends of the series circuit connected to separate terminals of the power source are spaced sufficiently far apart from each other such that current flow through the insulation material between ends adjacent the blocks is minimized and preferably substantially prevented for preventing short circuiting and failure of the heater.