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Utilisation Categories for various types of Load Switching

Utilisation Categories for various types of Load Switching

Utilisation Categories for various types of Load Switching

The following table provides an overview of the various abbreviations reated to Utilisation categories. Within a utilization category, the suitable size may be selected for the respective type. This depends on the rated current, the rated voltage and the electrical load to be switched.

Utilisation Category

Typical Application

Applicable IEC norm

AC-1

Non-inductive or slightly inductive loads, example:resistive furnaces, heaters 60947-4-1

AC-2

Slip RIng Motors: switching off 60947-4-1

AC-3

Squirrel cage motors: starting, switches off motors during running time 60947-4-1

AC-4

Squirrel-cage motors: starting, plugging, inching 60947-4-1

AC-5a

Switching of discharge lamps 60947-4-1

AC-5b

Switching of incandescent lamps 60947-4-1

AC-6a

Switching of transformers 60947-4-1

AC-6b

Switching of capacitor banks 60947-4-1

AC-7a

Slightly inductive loads in household appliances: examples: mixers, blenders 60947-4-1
61095

AC-7b

Motor-loads for household appliances: examples: fans, central vacuum 60947-4-1
61095

AC-8a

Hermetic refrigerant compressor motor control with manual resetting overloads 60947-4-1

AC-8b

Hermetic refrigerant compressor motor control with automatic resetting overloads 60947-4-1

AC-12

Control of resistive loads and solid state loads with opto-coupler Isoation 60947-5-2

AC-13

Control of solid state loads with transformer isolation 60947-5-1

AC-14

Control of smallelectromagnetic loads 60947-5-1

AC-15

Control of AC electromagnetic loads 60947-5-1

AC-20

Connecting and disconnecting under no-load conditions 60947-3

AC-21

Switching of resistive loads, including moderate overloads 60947-3

AC-22

Switching of mixed resistive and inductive loads, including moderate overloads 60947-3

AC-23

Switching of motor loads or other highly inductive loads 60947-3

AC-31A

AC-31B 

Non-inductive or weakly inductive loads 60947-6-1

AC-33A

AC33B

Motor loads or mixed loads including motors, resistors and up to 30 % incandescent lamp load 60947-6-1

AC-35A

AC-35B

Gas discharge lamp load 60947-6-1

AC-36A

AC36B

Incandescent lamp load 60947-6-1

AC-40

Distribution circuits of mixed resistive and inductive loads 60947-6-2

AC-41

Non-inductive or weakly inductive loads, resistance furnaces 60947-6-2

AC-42

Slip ring motors: Starting, switching off 60947-6-2

AC-43

Squirrel cage motors: Starting, switching off during operation 60947-6-2

AC-44

Squirrel cage motors: Starting, counter-current braking ¹) or reversing ¹), typing ²) 60947-6-2

AC-45a

Switching of gas discharge lamps 60947-6-2

AC-45b

Switching incandescent lamps 60947-6-2

AC-51

Induction-free or slightly inductive loads, resistance furnaces 60947-4-3

AC-52a

Control of the stator winding of a slip-ring motor: 8-hour operation with starting currents for starting processes, maneuvering, operation 60947-4-2

AC-52b

Control of the stator winding of a slip ring motor: Intermittent operation 60947-4-2

AC-53a

Control of a squirrel cage motor: 8-hour operation with starting currents for starting processes, maneuvering, operation 60947-4-2

AC-53b

Control of a squirrel cage motor: Intermittent operation 60947-4-2

AC-55a

Switching of electrical controls of discharge lamps 60947-4-3

AC-55b

Switching incandescent lamps 60947-4-3

AC-56a

Switching transformers 60947-4-3

AC-56b

Switching of capacitor batteries 60947-4-3

AC-58a

Control of a hermetically sealed refrigeration compressor motor with automatic reset of overload releases: 8-hour operation with starting currents for starting, maneuvering, operation 60947-4-2

AC-58b

The control of a hermetically sealed refrigeration compressor motor with automatic reset of the overload trips: Intermittent operation 60947-4-2

AC-140

Control of small electromagnetic loads with holding current ≤ 0.2 A; e.g. contactor relays 60947-5-2

A

Protection of circuits, with no rated short-time withstand current 60947-3

B

Protection of circuits, with a rated short-time withstand current 60947-3

DC-1

Non Inductive or slightly inductive loads, resistance furnaces, heaters 60947-4-1

DC-3

Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors 60947-4-1

DC-5

Series-motors, starting, plugging(1), inching(2), dynamic braking of motors 60947-4-1

DC-6

Switching of incandescent lamps 60947-4-1

DC-12

Control of resistive loads and solid state loads with opto-coupler isolation 60947-5-1
60947-5-2

DC-13

Control of DC electromagnetics 60947-5-1
60947-5-2

DC-14

Control of DC electromagnetic loads having economy resistors in the circuit 60947-5-1

DC-20

Connecting and disconnecting under no-load conditions 60947-5-1

DC-21

Switching of resistive loads, including moderate overloads 60947-5-1

DC-22

Switching of mixed resistive and inductive loads, including moderate overloads (i.e. shunt motors) 60947-5-1

DC-23

Switching of highly inductive loads (i.e. series motors) 60947-5-1
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