SIRIUS 3RF34 solid-state switching devices
3.6 Application planning
SIRIUS Innovations
340 System Manual, 01/2011, A8E56203870002-03
3.6.1 Application areas
3.6.1.1 Switching motors
The contactors for switching motors are "instantaneous switching", since this method is
particularly suited for inductive loads. The random distribution of the ON point across the
entire sine curve of the line voltage reduces faults to a minimum.
3.6.1.2 Use in a photovoltaic plant
Advantages of using solid-state reversing contactors in a photovoltaic plant:
● Actuation of motors to track the solar panels
● Very long service life and compact design
● Space-saving installation - normal contactors require double the space and would have to
be replaced too frequently
● Minimal cabling
No solutions using frequency converters have been implemented on thermal grounds and for
reasons of cost.
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