Alternating current:
AC-1
non-inductive or low inductance loads, resistance furnaces
AC-2
ring motors: starting, shutdown
AC-3
squirrel cage motors: starting, shutdown while running * 1)
AC-4
squirrel cage motors: starting, counter-current braking, reversal, jogging
AC-5A
turning on discharge lamps
AC-5B
turning on incandescent lamps
AC-6A
turning on transformers
AC-6B
switching capacitor banks
AC-7A
low inductance loads in household and similar applications. Domowe ob. motorized
AC-7B
motor loads in household appliances
AC-8A
switching on hermetic refrigerator motors
AC-8B
switching on hermetic motors of compressor chillers with automatic reset of overcurrent releases * 2)
Constant Current:
DC-1
non-inductive or low inductance loads, resistance furnaces
DC-3
shunt motors: starting, countercurrent braking, reversing, jogging, resistance braking
DC-5
series motors: starting, counter-current braking, reversing, jogging, resistance braking
DC-6
incandescent lighting
* 1) Category AC-3 instruments can be used for intermittent and time-limited jogging or countercurrent braking.
The number of such uses may not exceed 5 per minute or 10 per 10 minutes.
* 2) with hermetic refrigeration compressors, the compressor and motor are housed in a common hermetic housing without
external shaft or shaft seal, and the motor is supplied with coolant.
