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Moeller Wiring Manual > Specifications, Formulae, Tables > Utilisation categories for contactors
Specifications, Formulae, Tables
Utilisation categories for contactors
Type of current
 
Utilisation ­category
 
Typical examples of application
I = switch-on current,
Ic = switch-off current,
Ie = rated operational current,
U = voltage,
Ue = rated operational voltage
Ur = recovery voltage
 
Verification of electrical lifespan ­
 
 
 
Verification of switching capacity
Make
 
 
 
Break
 
Make
 
 
 
 
Break
 
 
cos φ
 
 
 
cos φ
 
 
 
 
cos φ
 
 
 
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, switch-off
 
All values
2.5
 
1
 
0.65
 
2.5
 
1
 
0.65
 
All values
 
4
 
1.05
 
0.65
 
4
 
1.05
 
0.8
AC-3
Squirrel-cage motors: stating, switch-off, switch-off during running4)
Ie ≤ 17
Ie > 17
6
6
1
1
 
0.65
0.35
1
1
0.17
0.17
 
0.65
0.35
Ie ≤ 100
Ie > 100
8
8
1.05
1.05
0.45
0.35
8
8
1.05
1.05
0.45
0.35
AC-4
Sqirrel-cage motors: starting, plugging, reversing, inching
Ie ≤ 17
Ie > 17
6
6
1
1
 
0.65
0.35
6
6
1
1
 
0.65
0.35
Ie ≤ 100
Ie > 100
10
10
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
 
 
 
 
 
 
 
 
1.52)
1.052)
 
1.52)
1.052)
 
AC-6A3)
Switching of transformers
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AC-6B3)
Switching of capacitor banks
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AC-7A
Slightly inductive loads in household appliances and similar applications
Data as supplied by the manufacturer
 
 
 
 
 
 
 
1.5
1.05
0.8
1.5
1.05
0.8
AC-7B
Motor load for household appliances
 
 
 
 
 
 
 
 
8.0
1.051)
 
8.0
1.051)
 
AC-8A
Switching of hermetically enclosed refrigerant compressor motors with manual reset of overload releases5)
 
 
 
 
 
 
 
 
6.0
1.051)
 
6.0
1.051)
 
AC-8B
Switching of hermetically enclosed refrigerant compressor motors with automatic reset of overload releases5)
 
 
 
 
 
 
 
 
6.0
1.051)
 
6.0
1.051)
 
 
AC-53a
 
Switching of squirrel-cage motor with semi-conductor contactors
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8.0
 
1.05
 
0.35
 
8.0
 
1.05
 
0.35

Type of current
 
Utilization category
 
Typical examples of application
I = switch-on current,
Ic = switch-off current,
Ie = rated operational current,
U = voltage,
Ue = rated operational voltage,
Ur = recovery voltage
 
Verification of electrical endurance
 
 
 
Verification of switching capacity
Make
 
 
 
Break
 
Make
 
Break
 
 
L/R ms
 
 
 
L/R ms
 
 
 
 
L/R ms
 
 
 
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, reversing, 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, reversing, inching, dynamic braking
All values
2.5
1
 
7.5
2.5
 
1
 
7.5
All values
 
4
1.5
 
1.05
1.05
 
15
4
1.52)
 
1.05
1.052)
 
15
DC-6
Switching of incandescent lamps
 
 
 
 
 
 
 
 
 
 
 
 
2)
 
2)
 
 
 
 
 
 
 
To IEC/EN 60 947-4-1, VDE 0660 Part 102

 

         
 
 
 
 
 
 
 
                           
1) cos φ = 0.45 for Ie ≤ 100 A; cos φ = 0.35 for Ie > 100 A.
2) Tests must be carried out with an incandescent lamp load connected.
3) Here, the test data are to be derived from the AC-3 or AC-4 test values in accordance with TableVIIb, IEC/EN 60 947-4-1.
 
4) Devices for utilization category AC-3 may be used for occasional inching or plugging during a limited period such as for setting up a machine; during this limited time period, the number of operations must not exceed a total of five per minute or more than ten in a ten minute period.
5) Hermetically enclosed refrigerant compressor motor means a combination of a compressor and a motor both of which are housed in the same enclosure with no external shaft or shaft seals, the motor running in the refrigerant.

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