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. |
EXECUTIONS
The assembling
system of described contactors allows many variants, such as:
- Multipolar
contactors;
- Contactors with normally closed poles;
- Contactors with
both normally closed and normally open poles
- Contactors without blow-out
coils and arc-chutes (type LTHV);
- Mechanically latched contactors
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