Utilization (Rating) Categories Electrical Components

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Utilisation Categories

Category           Typical Applications


AC-1                    Non-inductive or slightly inductive loads, resistance furnaces

AC-2                    Slipring motors: starting, switching off motors during run

AC-3                    Squirrel cage motors: starting, switching off motors during run

AC-4                    Squirrel cage motors: starting, plugging, inching 

AC-5a                  Switching of electric discharge lamp control

AC-5b                  Switching of incandescent lamps  

AC-6a                  Switching of power transformers  

AC-6b                  Switching of three phase capacitors. Inductance of leads between capacitors in parallel: min 6uH  

AC-7a                  Slightly inductive loads in household appliances

AC-7b                  Motor loads for household applications

AC-8a                  Switching of hermetically sealed compressor motors (manual reset) 

AC-8b                  Switching of hermetically sealed compressor motors (auto reset)

AC-12                  Control of resistive loads& solid state loads with isolation by optocouplers 

AC-13                  Control of solid state loads with transformer isolation

AC-14                  Control of small electromechanical loads

AC-15                  Electromagnets for contactors, valves, solenoidd actuators

AC-20                  Connecting & Disconnecting under no-load condition

AC-21                  Switching of resistive loads, including moderate overloads

AC-22                  Switching od mixed resistive & inductive loads, including moderate overloads

AC-23                  Swithcing of motor loads or other highly inductive loads

DC-1                    Non-inductive or slightly inductive loads, resistance furnaces

DC-3                    Shunt motors: starting,  plugging, inching

DC-4                    Series motors: starting, switching off motors during running

DC-5                    Series motors: starting, plugging, inching, dynamic breaking of motors

DC-6                    Switching of incandescent lamps

DC-12                  Control of resistive loads and solid state loads with isolation of optocouplers 

DC-13                  Conlrol of DC electromagnets

DC-14                  Control of DC electromagnetic loads having economy resistor in circuit 

DC-20                  Connecting & disconnecting under no-load conditions

DC-21                  Switching of resistive loads, including moderate overloads

DC-22                  Switching of mixed resistive & inductive loads, including moderate overloads (shunt motors)

DC-23                  Switching of highly inductive loads ( Series motors)

Note : All category listings according to IEC 947-4 & AS 3947-4
          Plugging is understood as stopping or reversing the motor rapidly by reversing the motor primary connections while the motor is running
          Inching is understood as energising the motor once ar repeatedly for short periods to obtain small movements of the driven mechanism

 

    

 

 

 

 

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