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Electrical system and shutdown switches
The compressor module is as standard equipped with a 24 V negative earthed system, which comprises:
Two temperature shut-down switch(es) (TS1 and TS2),
A loading solenoid valve (Y1),
A minimum loading pressure switch (PS2),
A vacuum indicator switch (PS3),
A start preventing switch (PS1).
All connections are grouped on a connection plug (type DIN 43652), situated at the left side of the units.
A 16 pin-connector is included in the compressor package.
The vacuum indicator switch (PS3) will be connected to an alarm lamp (horn) indicating when the air filter elements need servicing.

Il testo si riferisce un compressore da cantiere?