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About MDI Mercury Relays
MDI was incorporated in Michigan in 1975 and they continue to manufacture their mercury relays/contactors there. MDI is known for doing the tough and tricky jobs that ordinary equipment had a hard time doing consistently.

All switch parts are specially cleaned and contamination is avoided by use of tweezers, gloves, etc., when making assemblies.

Contactors are hermetically sealed with high quality glass to metal seals and the stainless steel tube is totally encapsulated in high grade epoxy to prevent moisture damage and voltage breakdown through the protective coating.
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