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CONSTRUCTION
Having been
designed for heavy duty the LTHS, LTHH and LTC contactors are guaranteed
for a very high number of operations even under shocks and vibrations.
The current breaking circuits of the contactors are equipped with
non direct magnetic blow-out circuits (in parallel with the main
contacts) made with a high nember of turns in order to work efficiently
both with high and low currents. Moreover the indirect magnetic
blow-out system makes the LTHS, LTHH and LTC contactors also suitable
to operate with quite high frequency current. Main pole contacts
are designed for easy cleaning and replacement with normal tools.
Relative brushing of the contact surfaces provide self cleaning
and low resistance. D.C. control coils operate without economy resistors
and with wide working range (al least -30% +30). The high insulation
class of the coil guarantees safe operation to very high ambient
temperatures. A "Varistor" cuts off the peak voltage when
the coil is deenergized. When an A.C. supply is necessaryit is possible
to fit a silicon rectifier.
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EXECUTIONS