Description Of Ratings

Load Categories (as defined by BS EN 60947-4-1)

   AC

• AC-1     Slightly inductive loads, resistance furnaces, or Non-inductive loads
• AC-2     Slip-ring motors: starting, switching off
• AC-3     Squirrel-cage motors: starting, switching off motors whilst running
• AC-4     Squirrel-cage motors: starting, plugging and/or inching
• AC-5a   Electrical discharge lighting control Switching
• AC-5b   Incandescent lighting Switching
• AC-6a   Transformer Switching
• AC-6b   Capacitor bank Switching
• AC-7a   Slightly inductive loads in household appliances and similar applications
• AC-7b   Motor-loads for household applications
• AC-8a   Hermetic refrigerant compressor motor control with manual resetting of overload releases
• AC-8b   Hermetic refrigerant compressor motor control with automatic resetting of overload releases

     DC

• DC-1    Slightly inductive loads, resistance furnaces, or Non-inductive loads
• DC-3    Shunt-motors: starting, plugging, inching
                Dynamic breaking of dc motors
• DC-5    Series-motors: starting, plugging, inching
                Dynamic breaking of dc motors
• DC-6     Incandescent lighting Switching

Note: AC-3 category may be used for occasional inching or plugging for limited time periods such as machine
set-up; during such time periods the number of such operations 'should not' exceed five per minute, or more
than ten in a 10 minute period.

Also: Hermetic refrigerant compressor motor is a combination which consists of a compressor and a motor,
both are enclosed in the same housing, with no external shaft or shaft seals, the motor operating in the refrigerant.