In brief
ZF's Air Compressor Clutch can disconnect compressor drive when the relevant pressure is reached. Its described normally closed construction forms part of the safety concept.
Useful to know
ZF's Air Compressor Clutch can disconnect compressor drive when the relevant pressure is reached. Its described normally closed construction forms part of the safety concept. [1]
This differs from the clutch between engine and gearbox. The name describes a similar coupling principle, but the driven consumer and control conditions are different.
Sources
For further detail and to check the information: