Utilization categories

Utilization Category	Type of Application
AC-1	Non-inductive or slightly inductive loads, example: resistive furnaces, heaters
AC-2	Slip-ring motors: switching off
AC-3	Squirrel-cage motors: starting, switches off motors during running time
AC-4	Squirrel-cage motors: starting, plugging, inching
AC-5a	Switching of discharge lamps
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: examples: mixers, blenders
AC-7b	Motor-loads for household appliances: examples: fans, central vacuum
AC-8a	Hermetic refrigerant compressor motor control with manual resetting overloads
AC-8b	Hermetic refrigerant compressor motor control with automatic resetting overloads
AC-12	Control of resistive loads and solid-state loads with optocoupler isolation
AC-13	Control of solid-state loads with transformer isolation
AC-14	Control of small electromagnetic loads
AC-15	Control of A.C. electromagnetic loads
AC-20	Connecting and disconnecting under no-load conditions
AC-21	Switching of resistive loads, including moderate overloads
AC-22	Switching of mixed resistive and inductive loads, including moderate overloads
AC-23	Switching of motor loads or other highly inductive loads
A	Protection of circuits, with no rated short-time withstand current
B	Protection of circuits, with a rated short-time withstand current
DC-1	Non Inductive or slightly inductive loads, resistance furnaces, heaters
DC-3	Shunt-motors, starting, plugging(1), inching(2), dynamic braking of motors
DC-5	Series-motors, starting, plugging(1), inching(2), dynamic braking of motors
DC-6	Switching of incandescent lamps
DC-12	Control of resistive loads and solid state loads with opto-coupler isolation
DC-13	Control of D.C. electromagnetics
DC-14	Control of D.C. electromagnetic loads having economy resistors in the circuit
DC-20	Connecting and disconnecting under no-load conditions
DC-21	Switching of resistive loads, including moderate overloads
DC-22	Switching of mixed resistive and inductive loads, including moderate overloads (i.e. shunt motors)
DC-23	Switching of highly inductive loads (i.e. series motors)