• APG's FS-400 Stainless Steel Float Switch
  • FS-400 Stainless Steel Float Switch
  • Stainless Steel Float Switch from APG Sensors
  • Single Point Float Switch | APG Sensors
  • APG Sensors Single Point Stainless Steel Float Switch

Stainless Steel Vertical Float Switch


Compact, Durable, Easy to Use

With all stainless steel wetted materials, operating temperatures up to 500° F, and a switch rated for VDC and VAC operation, the series FS-400 float switch fits a wide range of applications in two standard configurations.

Compact Size
From the top of the mounting threads, to the bottom of the stem, the FS-400 is less than 3.5" long, and the float is just over 2" wide.

Temperature Ranges
The FS-400-S has an operating temperature range of -40° to 383° F (-40° to 195° C), and the FS-400-HT extends that range to -40° to 500° F (-40° to 260° C)!

User Reversible Operation
FS-400 float switches come standard with Normally Open operation. The e-clip at the bottom of the stem is easily removed to change to orientation of the float, changing the switch operation to Normally Closed.

Datasheets & Downloads


Switch Points
Customer Reversible Specific Gravity
Minimum 0.6
Pressure Rating
200 psi (13.8 bar) - Standard
500 psi (34.5 bar) - High Temperature


Switch Rating
60 W
Max Current (AC)
0.4 A @ 240 VAC
0.5 A @ 120 VAC
Max Current (DC)
0.2 A @ 120 VDC
0.5 A @ 24 VDC


In Process


Mount & Stem Materials
316L SS, 15-7 SS
Float Materials
316L SS
3.44 in. - top of threads to bottom of stem
2.06 in. - float diameter


Operating Temperature
-40 to 383° F (-40 to 195° C) - Standard
-40 to 500° F (-40 to 260° C) - High Temp


New Vertical Float Switches from APG | FS-400 & FS-410