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Mercury Displacement Relays (MDR's) or Mercury Contactors as they are often called are used in many Industrial Applications including Electric Industrial Ovens, Temperature Control Panels, Infrared Heaters, Drying Ovens, Packaging Equipment and Other Plastic Industry Applications

Mercury Displament Relays/Contactors, MDRs

Contactors, Mercury Displacement Contactors, MDRs
                                                                       Mercury Displacement Contactors/Relays (MDRs)
 

About Mercury Displacement Relays - Description

Mercury Displacement Relays are all designed and built to meet the most exacting demands of industry. They have won their high place in the electrical field by doing the tough and tricky jobs. They have proved their ability to stand up under the most adverse conditions of temperature, dust and moisture, in all types of applications.

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.   

GENERAL INFORMATION, FEATURES AND SELECTION FACTORS

Mercury Displacement Relays are all designed and built to meet the most exacting demands of industry. They have won their high place in the electrical field by doing the tough and tricky jobs that ordinary equipment could at best do in an uncertain manner. They have proved their ability to stand up under the most adverse conditions of temperature, dust and moisture, in all types of applications. All the care required for the manufacture of high-grade instruments is used in the manufacture of the switches. 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.

The stainless steel tube is totally encapsulated in high grade UL approved epoxy to prevent moisture damage and voltage breakdown through the protective coating.
The coils are wound on compact nylon bobbins and molded onto the metal tube to provide minimum power loss. This allows for low coil power required to actuate the contactor. This also enables the units to handle high loads with minimum derating due to higher ambient temperatures.
 
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 the internal parts..
In multiple pole units each tube is actuated by its own coil. This eliminates pull-in variation between contact tubes, assuring consistent switching.
 

Mercury Displacement Relays (MDRs) and Power Controllers (SCR's) are used in a wide variety of applications throughout industry.
  • 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
Mercury Displacement Relays/Contactors: Glossary Of Terms & Expressions.pdf



Relays/Contactors,Mercury Relays,Mercury Displacement Relays,(MDR's)

1 Pole 30 Amp, Mercury Displacement Relays MDRs

1 Pole 30 Amp, Mercury Displacement Relay-MDR -Outline Drawing

1 Pole 35 Amp, Mercury Displacement Relay-MDR

1 Pole, 35/60 Amp Mercury Displacement Relay



 
The following links allow you to view various product styles and specifications along with the opportunity to request for a quotation. (Please select one of the following product categories:)

30 AMP Mercury Displacement Relays/Contactors - Single Pole
35 or 60 AMP Mercury Displacement Relays/Contactors - Single Pole
100 AMP Mercury Displacement Relays/Contactors - Single Pole
30 AMP Mercury Displacement Relays/Contactors - Two Pole
35 or 60 AMP Mercury Displacement Relays/Contactors - Two Pole
100 AMP Mercury Displacement Relays/Contactors - Two Pole
30 AMP Mercury Displacement Relays/Contactors - Three Pole
35 or 60 AMP Mercury Displacement Relays/Contactors - Three Pole
35 or 60 AMP Mercury Displacement Relays/Contactors - Four Pole
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