45 1.s.35 1.
Making and Breaking Conditions for Utilization Categories
Utilization category Durability test conditions Occasional operation
M aking and reaking pacitie ope tin cycle s
M aking itio reaking itio aking itio reaking itio s
I/Ie Cos.8
AC-2 2.65 1.m.45
Ie> 100 0.05 0.5 0.05 0.17 0.65 0.05 0.45
17 Ie< 100 0.65
AC-3 Ie< 0. Ic/Ie Ur/U Cos.17 0.65 0.05 0.65 1.65 1.35 0.8 1.05 0. 9
or or
L/R (ms) L/R (ms) L/R (ms) L/R (ms)
AC-1 0.
AC Slip-ring motors: starting, switching off.05 0.05 0.35
AC-4 Ie< 0.5 1.35 1.05 0.05 0.
AC-3 Cage motors: starting, switching off running motors.
Utilization categories for contactors according IEC 60947-4-1:
Alternating current
AC-1 Non-inductive slightly inductive loads, resistance furnaces.95 0. Ic/Ie Ur/U os.05 0.65 2.05 0.c.35
Key:
U (I) applied voltage (current)
Ur recovery voltage
L/R test circuit time constant
Ue(Ie) rated operational voltage (current)
Ic making and breaking current expressed d.35 1.05 0.95 1.General Information
Utilization Categories
A contactor's duty characterised the utilization category together with the rated operational voltage and current indicated.45 1.c. like the r.
AC-4 Cage motors: starting, plugging, inching.35 1.5 0.35 1.35 0.05 0.5 1.45 1.65 1.45 1.45
Ie> 100 0. a. I/Ie Cos.35 0.05 0.35 1.05 0.45
17 Ie< 100 0.05 0.17 0.35 0. value the symmetrical components
J m
1SBC101001C0202
7
