AT 120 float level switch for intensive pump control


The AT 120 is a float level switch designed for intensive pump control. It can be connected directly to pumps up to 1.5 HP or through a relay if working with high power pumps. Thanks to its wide switching angle of 120º, the AT 120 float switch protects the pump's engine and the electrical panels from jerking. This feature is highly appreciated in very agitated and turbulent liquids.


  • 120º switching angle that protects the pump's engine from jerking
  • No maintenance needed, thanks to its biconical shape that avoids any clogging
  • Easy to install, easy to use
  • Ecological float switch (no mercury, no lead)



  • Clear, clean liquids, rain water, certain types of wastewater 
  • Slightly aggressive liquids (oil, mud, paint, etc.) and more aggressive liquids if equipped with a HR HY cable
  • Emptying / Filling function
  • Overflow or dry-running protection
  • High / low level alarm
 AT 120 technical data sheet  (PDF 438Ko)
 AT 120 wiring diagram  (PDF 1411Ko)


  • It is highly recommended to use external ballasts and cable hangers with our float level switches.
  • The AT 120 float switch is available in 3 versions : (1) Emptying / Filling (2) Emptying + ground wire (3) "Special" emptying mode with multifunction plug for the automation of manual pumps.
  • This model is available with a HR HY (High Resistance) press-vulcanised housing for applications in aggressive liquids (acids, solvents, hydrocarbons, etc .) See AT 120 HR HY.
  • For pump control of several levels with several pumps, choose our AQUA XL level regulator or our SOBATUBA float level switches.


Operation mode Omnidirectionnal
Allowed fluid density 0,70 à 1,15
Maximum pressure 3.5 bars
Allowed temperature 85°C
Protection index IP 68
Power supply  250 VAC/VDC - 50/60 Hz
Cut-out power 20 (8) A (20 A résistive – 8 A inductive)
Housing material

Copolymer polypropylene

Cable 3 cond. 1 mm² Neoprene or HR HY
Weight without cable 195 g
Cable weight Neoprene 115 g/m - HR HY 110g/m
Ballast Loaded resin 250 g -  cliptable 275g
Standard cable lenght (serie) 3, 5, 10,15 et 20 m
Tilt level switches
2, avenue des Bosquets
Z.A. de l'Observatoire
78180 Montigny le Bretonneux
telephone+33 (0)1 61 37 35 60
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