Mercury Displament Relays/Contactors, MDRs

Mercury displacement contactors have several advantages over mechanical contactors. They provide superiorperformance and reliability for longer life and durability. They are more compact in size for easy installation. They have lower, predictable contact resistance. They can handle a variety of loads for increased design flexibility. They have lower coil power requirements. They have minimal derating due to higher ambient temperatures.Mercury displacement contactors provide a clean make and break with no chatter and little erosion.

Mercury Displacement Relays, Contactors or Switches as they are often called are hermetically sealed with high quality glass to metal seals.
The stainless steel tube is totally encapsulated in high grade UL approved epoxy to prevent moisture damage and voltage breakdown through the
protective coating.
 
Inert gases internally prevent excessive arcing between the mercury and the electrodes which enables the unit to function for millions of cycles
with very low contact resistance and minimum deterioration of internal parts. Mercury Displacement Relays are available in all standard coil
voltages, in single, two and three pole configurations. Other coil voltages are
available upon request.  

• Electric Heaters
• Industrial Ovens
• Infrared Heaters
• Drying Ovens
• Packaging Equipment
• Plastic Extruders         

Literature-Mercury Displacement Relays

Four Basic Relays Electrical Relays-Description & Tips.pdf

MDR Catalog X-Specifications, Selection Factors & Criteria