AC1
- Non-inductive or slightly inductive loads,resistance furnaces.
- IEC product standard 947-4
AC3
- Squirrel-cage motors: Starting, switching off motors during running.
- IEC product standard 947-3
AC4
- Starting of squirrel-cage motors with inching and plugging duty. Rapid Start/Stop. (Make and Break LRA).
AC11
- Auxiliary (control) circuits
AC15
- Control of AC electromagnetic Loads.
- IEC product standard 947-5-1
AC20
- Connecting and disconnecting under no-load.
- Assumes all switching operations are carried out by other capable devices before this device is operated.
- IEC product standard 947-3
AC21
- Switching of resistive loads, including moderate overloads.
- IEC product standard 947-3
AC22
- Switching of mixed resistive & inductive loads.
- IEC product standard 947-3
AC23
- Occasional switching of motors or other highly inductive loads.
- IEC product standard 947-3