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In conventional
magnetic ballast/capacitor power supplies there is
often a need to switch UV lamp power levels. The most popular switching
method utilizes a high voltage mercury relay. This allows
complete
electrical isolation between control and controlled circuit. These
switches are manufactured specifically to withstand the high voltage
demands of UV curing lamps. Our mercury relays offer an economical and
safe method of switching UV lamp power.
UV power supplies operate at high ambient temperatures. Mercury
relays/switches are well suited for use in this environment. Load
terminals are isolated from each other by a glass-to-metal hermetic
seal. Internally the “plunger assembly” floats on a pool of
mercury-hence the name mercury relay. When the coil is activated, this
assembly is magnetically drawn into this pool displacing mercury to
make contact with an internal electrode, closing (in the case of
normally open relay) the circuit between load terminals.
Our 15 amp high-voltage mercury relay is ideal for applications such as
UV lamp circuits. Dielectric insulating voltage exceeds 15,000V AC
between load terminals and coil circuit.
Easily
mounted, these relays offer long term reliability and compact
size. Mercury
relays are position-sensitive and must be mounted vertically to work
properly.
Pictured below
is a typical UV curing operating circuit showing UV ballast,
capacitors, mercury relays and UV curing lamp placement.
TCS Technologies stocks two (2) different styles of 120 volt coil
relays—normally open (NO) part # 112210 and normally closed (NC) part #
112212. Both are rated for operation up to 3500 volts—see drawing below.
We can also
provide different coil voltage and contact pole arrangement. Contact
factory for details.
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