Type of current |
Utilisation category |
Typical application |
AC |
AC-1 |
Non-inductive or slightly inductive loads, resistance furnaces |
AC-2 |
Slip ring motors: starting, switching off |
AC-3 |
Squirrel cage motors: starting, switching off motors while running |
AC-4 |
Squirrel cage motors: starting, regenerative braking, reversing, jogging |
AC-5a |
Switching gas discharge lamps |
AC-5b |
Switching of incandescent lamps |
AC-6a |
Switching of transformers |
AC-6b |
Switching of capacitor banks |
AC-8a |
Switching hermetically sealed cooling compressor motors with manual reset of the overload release |
AC-8b |
Switching hermetically sealed cooling compressor motors with automatic reset of the overload release |
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 AC electromagnetic loads |
AC-20A – AC-20B |
Connecting and disconnecting under no-load |
AC-21A – AC-21B |
Switching of resistive loads including moderate overloads |
AC-22A – AC-22B |
Switching of mixed loads, inductive and resistive loads including moderate overloads |
AC-23A – AC-23B |
Switching of motor loads or other highly inductive loads |
DC |
DC-1 |
Non-inductive or low-inductive load, resistance furnaces |
DC-3 |
Shunt motors: Starting, braking by reversal, inching, dynamic braking of DC motors |
DC-5 |
Series motors: Starting, braking by reversal, inching, dynamic braking of DC motors |
DC-6 |
Switching of incandescent lamps |
DC-12 |
Control of resistive loads and solid state loads with optocoupler isolation |
DC-13 |
Control of DC electromagnetics |
DC-14 |
Control of DC electromagnetic loads having economy resistors in the circuit |
DC-20A – DC-20B |
Connecting and disconnecting under no-load |
DC-21A – DC-21B |
Switching of resistive loads including moderate overloads |
DC-22A – DC-22B |
Switching of mixed loads, inductive and resistive loads including moderate overloads |
DC-23A – DC-23B |
Switching of motor loads or other highly inductive loads |