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Mercury Displacement Relays are all designed and built to
meet the most exacting demands of industry. They have won the respect of
professionals 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.
Available in all standard coil voltages, in single, two
and three pole arrangements. Other coil voltages available upon request.
In multiple pole units each tube is actuated by its own
coil. This eliminates pull-in variation between contact tubes, assuring
consistent switching.
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Proper Fusing is Required
- While MDIs contactors handle high inrush, such as lamp loads,
very well, mercury contactors are susceptible to damage by short
circuit currents, and should be fused to minimize short circuit
fault currents. Fast acting UL class RK-1 and class J fuses and
semiconductor I2t fuses more effectively protect relays than other
fuses. These are low-peak fuses designed to limit short circuit
currents. Regardless, when there is a short circuit, relay
operations should be closely monitored afterward because of the
possibility of concealed damage that could cause the relays to
behave inconsistently.
RECOMMENDED
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| 250VOLT |
600VOLT |
| KTN-R |
KTS-R |
| JJN/A3T |
JJS |
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JKS/A4J |
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KTK-R |
- Mercury Displacement relays must mount vertically +/- 10
degrees.
- Control line can be protected with metal oxide varistors (MOV).
Use suffix -11.
- Disconnect power before installing or servicing. Observe all
electrical and safety codes and ordinances such as National
Electrical Code (NEC) and the Occupational Safety and Health Act (OSHA).
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