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Best known for: Mercury relays
Our favorite product: All of their mercury relays which are made in the USA!
Fun fact: MDI stands for Mercury Displacement Industries
Newest product release: Mercury relays have been around a long time...
Warranty: One year


MDI Mercury Relays

MDI also has a number of other products that we currently do not feature online. We'd be happy to get you pricing and availability on any MDI product:
  • Solid state relays
  • Switching power supplies
  • Liquid level controls
  • Tilt switches
MDI Mercury Relays
  • 1, 2, 3 or 4 pole relays
  • Up to 100 amp
  • Coil voltages up to 600 volts
  • Hermetically sealed contacts
  • Mercury relays are the best relays for heater loads
  • Can be used with resistive, capacitive and inductive loads
  • We can easily cross reference any competitor, including Duracool
  • Life expectancy is several million operations
Legacy Series
  • Many years ago MDI standardized on the -18 for 2, 3 and 4 pole relays which just means they have a metal strap (previous models had a nylon strap). Single pole models never have it because they don't need a strap. 100 amp models do not have a -18 because they have always had the metal strap.

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.


Most Popular Series
MDI Mercury Relays

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Last price increase: July 1, 2016
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  • Phone: 847-658-8130
  • Fax: 847-658-0960

Marshall Wolf Automation, Inc.
923 South Main Street
Algonquin, IL 60102

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