12
(2) Making and breaking capacities
The contactor is defined by its making and breaking capacities in accordance with utilization categories specified in
Table 5.
The tests concerning the verification of the making and breaking capacities of the contactor are intended to verify
that the contactor is capable of making and breaking the currents stated in Table 9, and not to verify the contact
wear over long periods of operation.
The verifications of making capacity and breaking capacity are made as separate tests.
1 . Making capacity
The number is 100:50 operations of which are made at 85% and 50 operations at 110% of the rated coil voltage.
2. Breaking capacity
The total number of opening operations to be made is 25.
During tests within the limits of specified making and breaking capacities and with the specified number of opera-
tions, there shall be no permanent arcing, no flashover between poles, no blowing of the fuse in the earth circuit and
no welding of the contacts.
Table 9. Conditions for making and breaking corresponding to the several utilization categories (IEC 60947-4-1)
Category Value of the rated
operational current
Make Break
I/Ie U/Ue cosφ(1) Ic/Ie Ur/Ue cosφ(1)
AC-1
AC-2
AC-3
AC-4
(All values)
(All values)
Ie≦ 17A
17 A < Ie ≦ 100 A
Ie > 100 A
Ie≦17A
17 A < Ie ≦ 100 A
Ie > 100 A
1.5
4
10
10
8 (2)
12
12
10 (4)
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
0.95
0.65
0.65
0.35
0.35
0.65
0.35
0.35
1.5
4
8
8
6 (3)
10
10
8 (2)
1.1
1.1
1.1
1.1
1.1
1.1
1.1
1.1
0.95
0.65
0.65
0.35
0.35
0.65
0.35
0.35
Ie; Rated operational current U; Voltage before make
Ue; Rated operational voltage Ur; Recovery voltage
I; Current made Ic; Current broken.
1) Tolerance for cosφ: ±0.05
2) With a minimum of 1000 A for I or Ic.
3) With a minimum of 800 A for Ic.
4) With a minimum of 1200 A for I.
(3) Mechanical endurance
With respect to its resistance to mechanical wear, the contactor is characterized by the number of no-load operating
cycles (i.e., without current on the main contacts) which can be made before it becomes necessary to service of
replace any mechanical parts.
The contactor shall be installed as for normal service; in particular, the conductors shall be connected in the same
manner as for normal use.
The coils of the control electro-magnets shall be supplied at their rated voltage and, if applicable, at their rated
frequency.
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