Klockner Moeller Electric Parts from KlocknerMoeller.net
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Contactors and Relays
Contactors DIL |
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The three-phase motor dominates the electric motor
sector. Apart from individual low-power drives, which are often switched
directly by hand, most motors are controlled using contactors and
contactor combinations. The power rating in kilowatts (kW) or the
current rating in amperes (A) is therefore the critical feature for
correct contactor selection.
Physical motor design results in that rated currents for the same rating
sometimes differ widely. Furthermore it determines the ratio of the
transient peak current and the locked-rotor current to the rated
operational current (Ie).
Switching electrical heating installations, lighting fittings,
transformers and power factor correction installations, with their
typical individual characteristics, increases the wide range of
different uses for contactors.
The switching frequency can vary greatly in every application. The
difference can be, for example, from less than one operation per day up
to a thousand operations or more per hour. Quite often, in the case of
motors, a high switching frequency coincides with inching and plugging
duty.
Contactors are actuated by hand or automatically, using various types of
command devices, depending on the travel, time, pressure or temperature.
Any interrelationships required between a number of contactors can
easily be produced by means of interlocks via their auxiliary contacts.
The auxiliary contact of the contactor DILNM can be used as mirror
contact to IEC/EN 60947-4-1 Appendix F to show the condition of the main
contacts. A mirror contact is a normally closed contact that cannot be
similtaneously closed with the normally open main contacts.
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