Page 138 - L . V S W I T C H G E A R

intelligent
Contactor

The contactor

is an automaƟc keLJ switch consist of iron
core, main point and helping point .
Iron core: consists of two parts, one them
is staƟc and the other moving part, the
staƟc part contains an electric coil when
passing the current , generaƟng a magneƟc
Įeld and aƩract the staƟc part and when

the separaƟon of the current back bLJ the
spring .

Main point:

Its points that bear the high voltage
so it dedicated for power circuits and
divided into input and output points.
Input-point: (1-3.5), (L1-L2-L3), (R-T-S)
Output point: (2-4-6), (T1-T2-T3), (U
-V-W) then
Helping point:
Its points which work by low volt-
age and dedicated for control circuits
and their number can be increased
ďLJ ŵŽƵŶƟŶŐ ƉŝĞĐĞƐ ǁŝƚŚ Ă ŶƵŵďĞƌ ŽĨ
extra auxiliary points.

Work idea: Important informaƟon:

The contactor consist of two iron core Should be the current value of contactor more than the
one of them on E shape which contain load current, and must be the choice suitable and not much
a coil called boubina which Wrapped more the load current In order to preserve the economic
ĂƌŽƵŶĚ ŵŝĚͲƐŝĚĞ ͕ ŝƚƐ ǀŽůƚĂŐĞ ǁƌŝƩĞŶ side because the price of the contactor is increasing by the
on the boubina but not at the contac- current.
tor and the other sides are each brass The contactor can work in any type of varies power of mo-
ĐŽƉƉĞƌ ƌŝŶŐƐ ƚŽ ŵŽƟǀĞ ŵĂŐŶĞƟĐ ĮĞůĚ tor but in varies voltage.
and the other shape on [ shape , when
the current passing in this coil generate
ŵĂŐŶĞƟĐ ĮĞůĚ ƚŽ ĂƩƌĂĐƚ ƚŚĞ ΀ ĐŽŝů ƚŽ Thermal overload:
coil , the moving shape consist of many this component connected
of main points which connect the 3 directly in contactor , its compo-
phase and helping points which it be nent used to protect the motor
closed and open contacts and it varies from high currents , it’s consist of
ŝƚƐ ƉŽƐŝƟŽŶ ĨƌŽŵ ŽƉĞŶ ƚŽ ĐůŽƐĞĚ ĂŶĚ three thermal coils and this coils
closed to open . connected in series with coils of
motor .

140