Low Voltage Switch Gear Appendix 85
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.
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.
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 contactors to IEC 947-4-1 and EN 60947
Type of
current
Utilization
category
Typical examples of application
I = current made, I
c
= current broken
I
e
= rated operational current
U = voltage before make
U
e
= rated operational voltage
U
r
= recovery voltage
Verification of electrical endurance Verification of rated making and breaking capacities
Make Break Make Break
I
e
A
I
-
I
e
U
-
U
e
cos ϕ
Ic
-
I
e
U
r
-
U
e
cos ϕ
I
e
A
I
-
I
e
U
-
U
e
cos ϕ
I
c
-
I
e
U
r
-
U
e
cos ϕ
AC
AC-1
Non-inductive or slightly inductive loads, resistance
furnaces
All values 1 1 0.95 1 1 0.95 All values 1.5 1.05 0.8 1.5 1.05 0.8
AC-2 Slip-ring motors: starting, switching off All values 2.5 1 0.65 2.5 1 0.65 All values 4 1.05 0.65 4 1.05 0.65
AC-3
Squirrel-cage motors: starting, switching off motors
during running
4
I
e
≤ 17
I
e
> 17
6
6
1
1
0.65
0.35
1
1
0.17
0.17
0.65
0.35
I
e
≤ 100
I
e
> 100
10
10
1.05
1.05
0.45
0.35
8
8
1.05
1.05
0.45
0.35
AC-4 Squirrel-cage motors: starting, plugging, inching
I
e
≤ 17
I
e
> 17
6
6
1
1
0.65
0.35
6
6
1
1
0.65
0.35
I
e
≤ 100
I
e
> 100
12
12
1.05
1.05
0.45
0.35
10
10
1.05
1.05
0.45
0.35
AC-5A Switching of electric discharge lamp controls - - - - - - - - 3.0 1.05 0.45 3.0 1.05 0.45
AC-5B Switching of incandescent lamps - - - - - - - - 1.5
2
1.05
2
)1.5
2
1.05
2
)
AC-6A
3
Switching of transformers As given by the manufacturer - - - - - - -
AC-6B
3
Switching of capacitor banks As given by the manufacturer - - - - - - -
AC-7A
Slightly inductive loads in household appliances and
similar applications
As given by the manufacturer - 1.5 1.05 0.8 1.5 1.05 0.8
AC-7B Motor-loads for household applications As given by the manufacturer - 8.0 1.05
1
)8.01.05
1
)
AC-8A
Hermetic refrigerant compressor motor control with
manual resetting of overload releases
5
As given by the manufacturer - 6.0 1.05
1
)6.01.05
1
)
AC-8B
Hermetic refrigerant compressor motor control with
automatic resetting of overload releases
5
As given by the manufacturer - 6.0 1.05
1
)6.01.05
1
)
I
e
A
I
-
I
e
U
-
U
e
L/R
ms
Ic
-
I
e
U
r
-
U
e
L/R
ms
I
e
A
I
-
I
e
U
-
U
e
L/R
ms
I
c
-
I
e
U
r
-
U
e
L/R
ms
DC
DC-1
Non-inductive or slightly inductive loads, resistance
furnaces
All values 1 1 1 1 1 1 All values 1.5 1.05 1 1.5 1.05 1
DC-3
Shunt motors: starting, plugging, inching, dynamic
braking
All values 2.5 1 2 2.5 1 2 All values 4 1.05 2.5 4 1.05 2.5
DC-5
Series motors: starting, plugging, inching, dynamic
braking
All values 2.5 1 7.5 2.5 1 7.5 All values 4 1.05 15 4 1.05 15
DC-6 Switching of incandescent lamps - - - - - - - -
1.5
2
)
1.05
2
)
1.5
2
)
1.05
2
)
Utilization categories for control switches to IEC 947-5-1 and EN 60947
Type of
current
Utilization
category
Typical examples of application
I = current made, I
c
= current broken
I
e
= rated operational current
U
e
= rated operational voltage
U
r
= recovery voltage
U = voltage before make
t
0.95
= time in ms to reach 95 % of the steady-state
current
P = U
e
x I
e
= rated power consumption in watts
Normal conditions of use Abormal conditions of use
Make Break Make Break
I
-
I
e
U
-
U
e
cos ϕ
I
c
-
I
e
U
r
-
U
e
cos ϕ
I
-
I
e
U
-
U
e
cos ϕ
I
c
-
I
e
U
r
-
U
e
cos ϕ
AC AC-12
Control of resistive and solid state loads as in opto-
coupler input circuits
110.9110.9 - - - - - -
AC-13 Control of solid state loads with transformer isolation 2 1 0.65 1 1 0.65 10 1.1 0.65 1.1 1.1 0.65
AC-14 Control of small electromagnetic loads (≤ 72 VA) 6 1 0.3 1 1 0.3 6 1.1 0.7 6 1.1 0.7
AC-15 Control of electromagnetic loads (> 72 VA) 10 1 0.3 1 1 0.3 10 1.1 0.3 10 1.1 0.3
I
-
I
e
U
-
U
e
t
0.95
I
c
-
I
e
U
r
-
U
e
t
0.95
I
-
I
e
U
-
U
e
t
0.95
I
c
-
I
e
U
r
-
U
e
t
0.95
DC DC-12
Control of resistive and solid state loads as in opto-
coupler input circuits
111 ms111 ms - - - - - -
DC-13 Control of electromagnets 1 1 6xP
1
)1 1 6xP
1
)1.11.16xP
1
)1.1 1.1 6xP
1
)
DC-14
Control of electromagnetic loads having economy
resistors in circuits
10 1 15 ms 1 1 15 ms 10 1.1 15 ms 10 1.1 15 ms
Utilization categories for switches, disconnectors, switch-disconnectors, and fuse combination units to IEC 947-3 and EN 60947
Type of
current
Utilization
category
Typical applications
I = current made, I
c
= current broken
I
e
= rated operational current
U = voltage before make
U
e
= rated operational voltage
U
r
= recovery voltage
Verification of electrical endurance Verification of switching capacity
Make Break Make Break
I
e
A
I
-
I
e
U
-
U
e
cos ϕ
I
c
-
I
e
U
r
-
U
e
cos ϕ
I
e
A
I
-
I
e
U
-
U
e
cos ϕ
I
c
-
I
e
U
r
-
U
e
cos ϕ
AC
AC-20
A(B)
2
Connecting and disconnecting under no-load condi-
tions
All values
1
)
1
)
1
)
1
)
1
)
1
) All values
1
)1.05
1
)
1
)1.05
1
)
AC-21
A(B)
2
Switching of resistive loads, including moderate
overloads
All values 1 1 0.95 1 1 0.95 All values 1.5 1.05 0.95 1.5 1.05 0.95
AC-22
A(B)
2
Switching of mixed resistive and inductive loads, in-
cluding moderate overloads
All values 1 1 0.8 1 1 0.8 All values 3 1.05 0.65 3 1.05 0.65
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