Page 180 - 1SBC104119C0202_MainCatalog_R contactors

Utilization categories

Standards Utilization categories for the auxiliary contacts according to
IEC 60947-5-1
IEC publications 60941-1, 60947-4-1 and 60947-5-1 should be re- Alternating current:
ferred to on an international level with respect to contactors. –– AC-12 Control of resistive loads and static loads with opto-coupler

A contactor's duty is characterised by the utilization category together isolation
with the rated operational voltage and current indicated. –– AC-13 Control of static loads with transformer isolation
–– AC-14 Control of weak electromagnetic loads (≤ 72 VA)
Utilization categories for contactors according to IEC 60947-4-1 –– AC-15 Control of electromagnetic loads (> 72 VA).

Alternating current: Direct current:
–– AC-1 Non-inductive or slightly inductive loads, resistance furnaces –– DC-12 Control of resistive loads and static loads with opto-coupler
–– AC-2 Slip-ring motors: starting, switching off
–– AC-3 Cage motors: starting, switching off running motors isolation
–– AC-4 Cage motors: starting, plugging, inching –– DC-13 Control of DC electromagnets
–– AC-5a Discharge lamp switching –– DC-14 Control of DC electromagnets having economy resistors.
–– AC-5b Incandescent lamp switching In fact some applications, and the specific criteria characterizing the
–– AC-6a Transformer switching various loads controlled by contactors, may modify the utilization char-
–– AC-6b Capacitor bank switching acteristics of the contactors.
–– AC-7a Slightly inductive loads for domestic devices and similar ap-
DC power circuit switching
plications Arc suppression is more difficult in direct current than in alternating
–– AC-7b Motors for domestic applications current and this is all the more true the higher the circuit time constant
–– AC-8a Hermetic refrigeration compressor motor control with manual which is why it is necessary to connect several poles in series in order
to improve breaking conditions.
resetting of overload releases
–– AC-8b Hermetic refrigeration compressor motor control with auto-

matic resetting of overload releases.

Direct current: AC high current circuit switching
Possibility of increasing performances by connecting poles in parallel
–– DC-1 Non inductive or slightly inductive loads, resistance furnaces (please consult us).

–– DC-3 Shunt motors: starting, plugging, inching, dynamic breaking of Influence of the length of the conductors used in the contactor
DC motors control circuit
According to the operational voltages and the coil consumption, take
–– DC-5 Series motors: starting, plugging, inching, dynamic breaking of line resistances and capacitances into consideration, for the length and
DC motors the cross-sectional of the conductors.

–– DC-6 Incandescent lamp switching.

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