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Utilization categories for contactors to IEC 947-4-1 and EN 60947
Typical examples of application
I = current made, I
c
Type of
Utilization
I
= rated operational current
e
current
category
U = voltage before make
U
= rated operational voltage
e
U
= recovery voltage
r
Non-inductive or slightly inductive loads, resistance
AC-1
furnaces
AC-2
Slip-ring motors: starting, switching off
Squirrel-cage motors: starting, switching off motors
AC-3
4
during running
AC-4
Squirrel-cage motors: starting, plugging, inching
AC-5A
Switching of electric discharge lamp controls
AC-5B
Switching of incandescent lamps
AC
3
AC-6A
Switching of transformers
3
AC-6B
Switching of capacitor banks
Slightly inductive loads in household appliances and
AC-7A
similar applications
AC-7B
Motor-loads for household applications
Hermetic refrigerant compressor motor control with
AC-8A
manual resetting of overload releases
Hermetic refrigerant compressor motor control with
AC-8B
automatic resetting of overload releases
Non-inductive or slightly inductive loads, resistance
DC-1
furnaces
Shunt motors: starting, plugging, inching, dynamic
DC-3
braking
DC
Series motors: starting, plugging, inching, dynamic
DC-5
braking
DC-6
Switching of incandescent lamps
Note 1: cos ϕ = 0.45 for Ie ≤ 100 A; cos ϕ = 0.35 for Ie > 100 A.
2: The tests are to be carried out with an incandescent light load.
3: The test data are to be derived from the test values for AC-3 or AC-4 according to
Table VIIb, EN 60947-4-1.
Utilization categories for control switches to IEC 947-5-1 and EN 60947
Typical examples of application
I = current made, I
c
I
= rated operational current
e
U
= rated operational voltage
Type of
Utilization
e
U
= recovery voltage
current
category
r
U = voltage before make
t
= time in ms to reach 95 % of the steady-state
0.95
current
P = U
x I
= rated power consumption in watts
e
e
Control of resistive and solid state loads as in opto-
AC
AC-12
coupler input circuits
AC-13
Control of solid state loads with transformer isolation
AC-14
Control of small electromagnetic loads (≤ 72 VA)
AC-15
Control of electromagnetic loads (> 72 VA)
Control of resistive and solid state loads as in opto-
DC
DC-12
coupler input circuits
DC-13
Control of electromagnets
Control of electromagnetic loads having economy
DC-14
resistors in circuits
Note 1: The value "6 x P" results from an empirical relationship which is found to represent most DC magnetic loads to an upper limit of P = 50 W, viz 6 x P = 300 ms. Loads having power
consumption greater than 50 W are assumed to consist of smaller loads in parallel. Therefore, 300 ms is to be an upper limit, irrespective of the power consumption value.
Utilization categories for switches, disconnectors, switch-disconnectors, and fuse combination units to IEC 947-3 and EN 60947
Typical applications
I = current made, I
c
Type of
Utilization
I
= rated operational current
e
current
category
U = voltage before make
U
= rated operational voltage
e
U
= recovery voltage
r
AC-20
Connecting and disconnecting under no-load condi-
AC
2
A(B)
tions
AC-21
Switching of resistive loads, including moderate
2
A(B)
overloads
AC-22
Switching of mixed resistive and inductive loads, in-
2
A(B)
cluding moderate overloads
Verification of electrical endurance
= current broken
Make
I
e
A
All values
All values
≤ 17
I
e
I
> 17
e
≤ 17
I
e
I
> 17
e
-
-
As given by the manufacturer
As given by the manufacturer
As given by the manufacturer
As given by the manufacturer
As given by the manufacturer
5
As given by the manufacturer
5
I
e
A
All values
All values
All values
-
Normal conditions of use
= current broken
Make
Verification of electrical endurance
= current broken
Make
I
e
A
All values
All values
All values
Break
I
U
Ic
U
r
cos ϕ
cos ϕ
-
-
-
-
I
U
I
U
e
e
e
e
1
1
0.95
1
1
0.95
2.5
1
0.65
2.5
1
0.65
6
1
0.65
1
0.17
0.65
6
1
0.35
1
0.17
0.35
6
1
0.65
6
1
0.65
6
1
0.35
6
1
0.35
-
-
-
-
-
-
-
-
-
-
-
-
I
U
L/R
Ic
U
L/R
r
-
-
-
-
I
U
ms
I
U
ms
e
e
e
e
1
1
1
1
1
1
2.5
1
2
2.5
1
2
2.5
1
7.5
2.5
1
7.5
-
-
-
-
-
-
4: AC-3 category may be used for occasional inching (jogging) or plugging for limited
time periods such as machine set-up; during such limited time periods the number
of such operations should not exceed five per minute or more than ten in a ten
minute period.
5: A hermetic refrigerant compressor motor is a combination consisting of a compres-
sor and a motor, both of which are enclosed in the same housing, with no external
shaft or shaft seals, the motor operating in the refrigerant.
Break
I
U
I
U
c
r
cos ϕ
cos ϕ
-
-
-
-
I
U
I
U
e
e
e
e
1
1
0.9
1
1
0.9
2
1
0.65
1
1
0.65
6
1
0.3
1
1
0.3
10
1
0.3
1
1
0.3
I
U
I
U
c
r
-
-
t
-
-
t
0.95
0.95
I
U
I
U
e
e
e
e
1
1
1 ms
1
1
1 ms
1
1
1
6xP
) 1
1
6xP
10
1
15 ms 1
1
15 ms
Break
I
U
I
U
c
r
cos ϕ
cos ϕ
-
-
-
-
I
U
I
U
e
e
e
e
1
1
1
1
1
1
)
)
)
)
)
1
1
0.95
1
1
0.95
1
1
0.8
1
1
0.8
Low Voltage Switch Gear
Verification of rated making and breaking capacities
Make
I
I
U
e
cos ϕ
-
-
I
U
A
e
e
All values
1.5
1.05
0.8
All values
4
1.05
0.65
≤ 100
I
10
1.05
0.45
e
I
> 100
10
1.05
0.35
e
≤ 100
I
12
1.05
0.45
e
I
> 100
12
1.05
0.35
e
-
3.0
1.05
0.45
2
2
-
1.5
1.05
)
-
-
-
-
-
-
-
-
-
1.5
1.05
0.8
1
-
8.0
1.05
)
1
-
6.0
1.05
)
1
-
6.0
1.05
)
I
I
U
L/R
e
-
-
I
U
ms
A
e
e
All values
1.5
1.05
1
All values
4
1.05
2.5
All values
4
1.05
15
1.5
2
-
1.05
)
2
)
Abormal conditions of use
Make
I
U
cos ϕ
-
-
I
U
e
e
-
-
-
10
1.1
0.65
6
1.1
0.7
10
1.1
0.3
I
U
-
-
t
0.95
I
U
e
e
-
-
-
1
1
)
1.1
1.1
6xP
10
1.1
15 ms 10
Verification of switching capacity
Make
I
I
U
e
cos ϕ
-
-
I
U
A
e
e
1
1
)
All values
)
1.05
)
All values
1.5
1.05
0.95
All values
3
1.05
0.65
Appendix
Break
I
U
c
r
cos ϕ
-
-
I
U
e
e
1.5
1.05
0.8
4
1.05
0.65
8
1.05
0.45
8
1.05
0.35
10
1.05
0.45
10
1.05
0.35
3.0
1.05
0.45
2
2
1.5
1.05
)
-
-
-
-
-
-
1.5
1.05
0.8
1
8.0
1.05
)
1
6.0
1.05
)
1
6.0
1.05
)
I
U
L/R
c
r
-
-
I
U
ms
e
e
1.5
1.05
1
4
1.05
2.5
4
1.05
15
1.5
2
1.05
)
2
)
Break
I
U
c
r
cos ϕ
-
-
I
U
e
e
-
-
-
1.1
1.1
0.65
6
1.1
0.7
10
1.1
0.3
I
U
c
r
-
-
t
0.95
I
U
e
e
-
-
-
1
) 1.1
1.1
6xP
)
1.1
15 ms
Break
I
U
c
r
cos ϕ
-
-
I
U
e
e
1
1
)
1.05
)
1.5
1.05
0.95
3
1.05
0.65
85
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