Stainless Steel Vertical Float Switch
Compact, Durable, Easy to Use
With all stainless steel wetted materials, operating temperatures up to 500° F, and a 100 W switch, the series FS-400 float switch fits a wide range of applications in two standard configurations. APG’s stainless steel float switch is compatible with a wide range of liquids, temperatures, and pressures.
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.
The FS-400-S has an operating temperature range of -40° to 368° F (-40° to 187° C), and the FS-400-HT extends that range to -40° to 500° F (-40° to 260° C)!
FS-400-S switches carry CSA Explosion Proof certifications, while FS-400-HT models are certified for General Use. All FS-400 switches are NSF 169 certified.
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 the orientation of the float, changing the switch operation to Normally Closed.
Have a Question?
If you have any questions about our Stainless Steel Vertical Float Switch or any of our other products, contact us today.
- C I, D 1 Hazardous Locations
- Food / Beverage
- Water / Wastewater
Common Model Configurations
All common model configurations can be purchased online, click the model number link below. Refer to Model Number Configurator on the datasheet for a full list of configuration options.
|Model Number||Model Description|
|FS-400-S-M1-M1-0.6-P0-24||Stainless Steel Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 24" Wires|
|FS-400-HT-M1-M1-0.6-P0-24||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 24" Wires|
|FS-400-S-M1-M1-0.6-P0-36||Stainless Still Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 36" Wires|
|FS-400-HT-M1-M1-0.6-P0-36||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 36" Wires|
|FS-400-S-M1-M1-0.6-P0-48||Stainless Steel Stem and Float, Standard Temperature, 0.6 SG, 1/4" NPTM, 48" Wires|
|FS-400-HT-M1-M1-0.6-P0-48||Stainless Steel Stem and Float, High Temperature, 0.6 SG, 1/4" NPTM, 48" Wires|
Datasheets & Downloads
200 psi / 13.8 bar (Standard)
500 psi / 34.5 bar (High Temperature)
Normally Open Actuation
0.220" ± 0.05"
5.59 mm ± 1.27 mm
Normally Closed Actuation
0.160" ± 0.05"
4.06 mm ± 1.27 mm
0.070" ± 0.02"
1.78 mm ± 0.51 mm
100 W (resistive load only)
Max Current (AC, 50/60 Hz)
0.416 A @ 240 VAC
0.833 A @ 120 VAC
1 A @ ≤ 100 VSC
Max Current (DC)
0.833 A @ 120 VDC
1 A @ ≤ 100 VDC
Class I, Div 1 & 2; Grps A,B,C,D, T3
Class II, Div 1; Grps E,F, T200°C
Class II, Div 2; Grps F,G, T200°C
Ta -40°C to 187°C
Mount & Stem Materials
3.44 in. - top of threads to bottom of stem
2.06 in. - float diameter
-40 to 368° F (-40 to 187° C)
-40 to 500° F (-40 to 260° C)
New Vertical Float Switches from APG | FS-400 & FS-410