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 ACÂ 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-31AAC-31BÂ |
Non-inductive or weakly inductive loads | 60947-6-1 |
AC-33AAC33B |
Motor loads or mixed loads including motors, resistors and up to 30Â % incandescent lamp load | 60947-6-1 |
AC-35AAC-35B |
Gas discharge lamp load | 60947-6-1 |
AC-36AAC36B |
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 |
