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Liquid and Air Flow Switches

MCDONNELL & MILLER
 		Flow Switches

Click for images of all products

Narrow by * Products that meet your criteria are shown in table below.
Product Options
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Item Min. Flow Rate (GPM) Max. Flow GPM Includes Connection Size (In.) Switch Enclosure Min. Ambient Temp. (F) Max. Fluid Temp. (F) Max. Pressure (PSI) Operating Velocity Range (FPM) Material of Construction Wetted Materials Max. Operating Velocity (FPM) Max. Duct Size (In.) Package
Qty.		 Mfr.# ZoroItem# Price Qty.
Liquid Flow Switch 1.5 15 - 3/4 FNPT NEMA 1 32 250 150 - - Brass, EPDM - - 1 FS5-3/4 G2622532 $171.13/EA
Paddle Kit - - 1 Each of 1", 2", 3", and 6" Paddles - - - - - - - - - - 4 FS4-15SS G1663611 $19.34/PK
- 4.8 7.7 - 1 1/4 MNPT NEMA 1 32 300 1000 - - S/S, PTFE - - 1 FS7-4S G1412275 $565.62/EA
General Purpose Switch 5.8 131 - 1 MNPT NEMA 4 32 250 160 130 to 280 Brass, SS, EPDM Brass, Stainless Steel, EPDM 600 - 1 FS254 G0616917 $158.99/EA
Paddle Kit - - 1 Each of 1-1/4" and 6" Paddles - - - - - - - - - - 2 FS7-28S G0672201 $21.08/PK
- 0.12 2.5 - 3/4 FNPT NEMA 4X 32 225 100 - - Brass, S/S, Buna N, Viton, PTFE - - 1 FS6-W-3/4 G1911192 $349.96/EA
Paddle Kit - - 1 Each of 1-1/4" and 6" Paddles - - - - - - - - - - 2 FS7-4-28 G0999871 $12.61/PK
- 4.8 7.7 - 1 1/4 MNPT NEMA 4X -65 300 1000 - - S/S, PTFE - - 1 FS7-4SW G0893103 $663.65/EA
- - - - - NEMA 1 32 - - 910 to 1610 Vane: Steel/Brass, Seal: Steel/PTFE - 2500 7-1/4 1 AF-1 G0750093 $154.62/EA
- 4.8 7.7 - 1 1/4 MNPT NEMA 1 32 300 300 - - Brass, S/S, Bronze, PTFE - - 1 FS7-4 G2339705 $333.61/EA
- 0.12 2.5 - 3/4 FNPT NEMA 1 32 225 100 - - Brass, S/S, Buna N, Viton, PTFE - - 1 FS6-3/4 G2805013 $310.54/EA
General Purpose Switch 5.8 131 - 1 MNPT NEMA 1 32 250 160 130 to 280 Brass, SS, EPDM Brass, Stainless Steel, EPDM 600 - 1 FS251 G2373856 $117.10/EA
- 1.5 15 - 1 MNPT NEMA 1 32 250 150 - - Brass, EPDM - - 1 FS5-1 G3327082 $205.74/EA
- 0.12 2.5 - 1 FNPT NEMA 1 32 225 100 - - Brass, S/S, Buna N, Viton, PTFE - - 1 FS6-1 G3005037 $310.54/EA
- 4.8 7.7 - 1 1/4 MNPT NEMA 7,9 32 300 300 - - Brass, S/S, Bronze, PTFE - - 1 FS7-4E G2774886 $487.20/EA
- 4.8 7.7 - 1 1/4 MNPT NEMA 4X -65 300 300 - - Brass, S/S, Bronze, PTFE - - 1 FS7-4W G1763361 $403.80/EA
- 0.12 2.5 - 1 FNPT NEMA 4X 32 225 100 - - Brass, S/S, Buna N, Viton, PTFE - - 1 FS6-W-1 G3033344 $349.96/EA
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Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS5-3/4, Z#: G2622532

Product Description: General Purpose Switch, Min. Flow Rate 1.5 GPM, Max. Flow GPM 15, Connection Size (In.) 3/4 FNPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 250 F, Max. Pressure 150 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : General Purpose Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Signal Lights, Alarms, Motors, Automatic Burners and Metering Devices

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS4-15SS, Z#: G1663611

Product Description: Paddle Kit, Stainless Steel, Includes 1 Each of 1 In, 2 In, 3 In, and 6 In Paddles, Package Quantity 4
Type : Stainless Steel

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4S, Z#: G1412275

Product Description: Industrial/Heavy-duty, Min. Flow Rate 4.8 GPM, Max. Flow GPM 7.7, Connection Size (In.) 1 1/4 NPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 300 F, Max. Pressure 1000 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : Industrial/Heavy-duty, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Large Pipe Applications Including Heating and Hydronic Systems, Air-conditioning, Refrigeration and Process Work

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS254, Z#: G0616917

Product Description: General Purpose Switch, Min. Flow Rate 5.8 GPM, Max. Flow GPM 131, Connection Size (In.) 1 NPT, Switch Enclosure NEMA4, Min. Ambient Temp. 32 F, Min. Fluid Temp. 30 F, Max. Fluid Temp. 250 F, Max. Pressure 160 PSI, Operating Velocity Range 130 - 280 FPM, Switch Type Single Pole Double Throw Snap Switch, Contact Rating 7.4A @ 120 VAC - Full Load, 120 VA @ 120 or 240 VAC - Pilot Duty, Body Material Brass, Material of Construction Brass, Stainless Steel, EPDM, Voltage 120/240
Min. Fluid Temp. (F) : 30, Switch Type : Single Pole Double Throw Snap Switch, Contact Rating : 7.4A @ 120 VAC - Full Load, 120 VA @ 120 or 240 VAC - Pilot Duty, Body Material : Brass, Voltage : 120/240, Application : Signal Lights, Alarms, Motors, Automatic Burners and Metering Devices

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-28S, Z#: G0672201

Product Description: Paddle Kit, Stainless Steel, Includes 1 Each of 1 1/4 In and 6 In Paddles, Package Quantity 2
Type : Stainless Steel

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS6-W-3/4, Z#: G1911192

Product Description: High Sensitivity Switch, Min. Flow Rate 0.12 GPM, Max. Flow GPM 2.5, Connection Size (In.) 3/4 NPT, Switch Enclosure NEMA 4X, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 225 F, Max. Pressure 100 PSI, Switch Type Single Pole Double Throw Snap Switch
Type : High Sensitivity Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Application : Water Treatment Systems, Cooling Systems for Electronic Circuits, Compressors, Booster Pumps, Bearings and other Applications that Need Instant Switching

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4-28, Z#: G0999871

Product Description: Paddle Kit, Bronze, Includes 1 Each of 1 1/4 In and 6 In Paddles, Package Quantity 2
Type : Bronze

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4SW, Z#: G0893103

Product Description: Industrial/Heavy-duty Switch, Min. Flow Rate 4.8 GPM, Max. Flow GPM 7.7, Connection Size (In.) 1 1/4 NPT, Switch Enclosure NEMA 4X, Min. Ambient Temp. -65 F, Min. Fluid Temp. -65 F, Max. Fluid Temp. 300 F, Max. Pressure 1000 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : Industrial/Heavy-duty Switch, Min. Fluid Temp. (F) : -65, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Large Pipe Applications Including Heating and Hydronic Systems, Air-conditioning, Refrigeration and Process Work, Water-tight, Dust-tight Applications

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: AF-1, Z#: G0750093

Product Description: Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Max. Ambient Temp. 300 F, Operating Velocity Range 910 to 1610 FPM, Switch Type Single Pole Double Throw Snap Switch, Material of Construction Vane: Steel/Brass, Seal: Steel/PTFE, Voltage 120/240
Max. Ambient Temp. (F) : 300, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : General Purpose Applications with Medium and High Velocity Requirements

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4, Z#: G2339705

Product Description: Industrial/Heavy-duty Liquid Flow Switch, Min. Flow Rate 4.8 GPM, Max. Flow GPM 7.7, Connection Size (In.) 1 1/4 NPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 300 F, Max. Pressure 300 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : Industrial/Heavy-duty Liquid Flow Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Large Pipe Applications Including Heating and Hydronic Systems, Air-conditioning, Refrigeration and Process Work

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS6-3/4, Z#: G2805013

Product Description: Heavy-duty, High Sensitivity Switch, Min. Flow Rate 0.12 GPM, Max. Flow GPM 2.5, Connection Size (In.) 3/4 NPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 225 F, Max. Pressure 100 PSI, Switch Type Single Pole Double Throw Snap Switch
Type : Heavy-duty, High Sensitivity Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Application : Water Treatment Systems, Cooling Systems for Electronic Circuits, Compressors, Booster Pumps, Bearings and other Applications that Need Instant Switching

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS251, Z#: G2373856

Product Description: General Purpose Switch, Min. Flow Rate 5.8 GPM, Max. Flow GPM 131, Connection Size (In.) 1 NPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 250 F, Max. Pressure 160 PSI, Operating Velocity Range 130 - 280 FPM, Switch Type Single Pole Double Throw Snap Switch, Contact Rating 7.4A @ 120 VAC - Full Load, 120 VA @ 120 or 240 VAC - Pilot Duty, Body Material Brass, Material of Construction Brass, Stainless Steel, EPDM, Voltage 120/240
Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Contact Rating : 7.4A @ 120 VAC - Full Load, 120 VA @ 120 or 240 VAC - Pilot Duty, Body Material : Brass, Voltage : 120/240, Application : Signal Lights, Alarms, Motors, Automatic Burners and Metering Devices

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS5-1, Z#: G3327082

Product Description: 1/3 HP, General Purpose, Electrically Operated, Min. Flow Rate 1.5 GPM, Max. Flow GPM 15, Connection Size (In.) 1 NPT, Switch Enclosure NEMA1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 250 F, Max. Pressure 150 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : 1/3 HP, General Purpose, Electrically Operated, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Signal Lights, Alarms, Motors, Automatic Burners and Metering Devices

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS6-1, Z#: G3005037

Product Description: 7.4 Amps, High Sensitivity Switch, Min. Flow Rate 0.12 GPM, Max. Flow GPM 2.5, Connection Size (In.) 1 NPT, Switch Enclosure NEMA 1, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 225 F, Max. Pressure 100 PSI, Switch Type Single Pole Double Throw Snap Switch
Type : 7.4 Amps, High Sensitivity Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Application : Water Treatment Systems, Cooling Systems for Electronic Circuits, Compressors, Booster Pumps, Bearings and other Applications that Need Instant Switching

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4E, Z#: G2774886

Product Description: Industrial/Heavy-duty Switch, Min. Flow Rate 4.8 GPM, Max. Flow GPM 7.7, Connection Size (In.) 1 1/4 NPT, Switch Enclosure NEMA 7,9, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 300 F, Max. Pressure 300 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : Industrial/Heavy-duty Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Large Pipe Applications Including Heating and Hydronic Systems, Air-conditioning, Refrigeration and Process Work, Hazardous Environment Applications

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS7-4W, Z#: G1763361

Product Description: Industrial/Heavy-duty Switch, Min. Flow Rate 4.8 GPM, Max. Flow GPM 7.7, Connection Size (In.) 1 1/4 NPT, Switch Enclosure NEMA 4X, Min. Ambient Temp. -65 F, Min. Fluid Temp. -65 F, Max. Fluid Temp. 300 F, Max. Pressure 300 PSI, Switch Type Single Pole Double Throw Snap Switch, Voltage 120/240
Type : Industrial/Heavy-duty Switch, Min. Fluid Temp. (F) : -65, Switch Type : Single Pole Double Throw Snap Switch, Voltage : 120/240, Application : Large Pipe Applications Including Heating and Hydronic Systems, Air-conditioning, Refrigeration and Process Work, Water-tight, Dust-tight Applications

Product Details

Liquid and Air Flow Switches

Brand: MCDONNELL & MILLER
Mfr#: FS6-W-1, Z#: G3033344

Product Description: High Sensitivity Switch, Min. Flow Rate 0.12 GPM, Max. Flow GPM 2.5, Connection Size (In.) 1 NPT, Switch Enclosure NEMA 4X, Min. Ambient Temp. 32 F, Min. Fluid Temp. 32 F, Max. Fluid Temp. 225 F, Max. Pressure 100 PSI, Switch Type Single Pole Double Throw Snap Switch
Type : High Sensitivity Switch, Min. Fluid Temp. (F) : 32, Switch Type : Single Pole Double Throw Snap Switch, Application : Water Treatment Systems, Cooling Systems for Electronic Circuits, Compressors, Booster Pumps, Bearings and other Applications that Need Instant Switching