Alternating current:
AC - 1 Non-inductive or slightly inductive
loads, resistance furnaces
AC - 2 Slip-ring motors: starting, switch-off
AC - 3 Squirrel-cage motors: stating, switch-off,
switch-off during running
AC - 4 Squirrel-cage motors: starting, plugging,
reversing, inching
AC - 5A Switching of electric discharge lamp controls
AC - 5B Switching of incandescent lamps
AC - 6A Switching of transformers
AC - 6B Switching of capacitor banks
AC - 7A Slightly inductive loads in household appliances and
similar applications
AC - 7B Motor load for household appliances
AC - 8A Switching of hermetically enclosed refrigerant
compressor motors with manual reset of
overload releases
AC - 8B Switching of hermetically enclosed refrigerant
compressor motors with automatic reset of
overload releases
AC - 53A Switching of squirrel-cage motor with
semi-conductor contactors
Direct current:
DC-1 Non-inductive or slightly inductive loads,
resistance furnaces.
DC-3 Shunt motors: starting, plugging, inching. Dynamic
breaking of d.c. motors.
DC-5 Series motors: starting, plugging, inching. Dynamic
breaking of d.c. motors.
DC-6 Switching of incandescent lamps
Utilization categories for contactor relays
Alternating current:
AC-12 Control of resistive loads and solid state loads
with isolation by opto couplers.
with isolation by opto couplers.
AC-13 Control of solid state loads with transformer
isolation.
AC-14 Control of small electromagnetic loads (≤ 72 VA).
AC-15 Control of electromagnetic loads (> 72 VA).
Direct current:
DC-12 Control of resistive loads and solid state
loads with isolation by opto couplers.
DC-13 Control of electromagnets.
DC-14 Control of electromagnetic loads having economy
resistors in circuit.
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