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The ssr controls the 220 feed to the elements via the 220 v. receptacle. The MDR isn't controlled by the ssr, it breaks the circuits so no voltage flows to the elements when the door is open. (see the microswitch actuated by a dog or whatever on the door of the annealer). SSR's leak voltage even when open so they don't provide the complete break in voltage that a mechanical or mercury relay will.
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Dave Hilty
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