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  • FS251, General Purpose Flow Switch w/ NEMA 1 Encl. Product Image
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    FS251, General Purpose Flow Switch w/ NEMA 1 Encl. 120611 FS251, General Purpose Flow Switch w/ NEMA 1 Encl.
    SKU: 120611 Mcdonnell & Miller
    SKU: 120611
    Brand: Mcdonnell & Miller
    (15)
    $112.12 each
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    124
    Tue, Nov 2
    124
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    124 Tue, Nov 2
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  • FS4-3, 1" General Purpose Flow Switch - Paddle Style Product Image
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    FS4-3, 1" General Purpose Flow Switch - Paddle Style 114400 FS4-3, 1" General Purpose Flow Switch - Paddle Style
    Contains Lead
    SKU: 114400 Mcdonnell & Miller
    SKU: 114400
    Brand: Mcdonnell & Miller
    (5)
    $132.88 each
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    793
    Tue, Nov 2
    793
    QtyArrives
    793 Tue, Nov 2
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  • Brass Flow Switch w/ Flexible Paddles<br>(Single Switch) Product Image
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    Brass Flow Switch w/ Flexible Paddles (Single Switch) IFS01BF-1 Brass Flow Switch w/ Flexible Paddles (Single Switch)
    SKU: IFS01BF-1 Taco
    SKU: IFS01BF-1
    Brand: Taco
    (5)
    $118.90 each
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    56
    Tue, Nov 2
    99
    QtyArrives
    56 Tue, Nov 2
    43 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
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  • FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) Product Image
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    FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) 120610 FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W)
    SKU: 120610 Mcdonnell & Miller
    SKU: 120610
    Brand: Mcdonnell & Miller
    (7)
    $195.35 each
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    122
    Tue, Nov 2
    122
    QtyArrives
    122 Tue, Nov 2
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  • 1" Liquid Flow Switch<br>(Set of 4 Paddles) Product Image
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    1" Liquid Flow Switch (Set of 4 Paddles) F261KAH-V01C 1" Liquid Flow Switch (Set of 4 Paddles)
    SKU: F261KAH-V01C Johnson Controls
    SKU: F261KAH-V01C
    Brand: Johnson Controls
    (1)
    $108.91 each
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    32
    Tue, Nov 2
    32
    QtyArrives
    32 Tue, Nov 2
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  • 1" NPT Flow Switch<br>(SS Paddles) Product Image
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    1" NPT Flow Switch (SS Paddles) F261MAH-V01C 1" NPT Flow Switch (SS Paddles)
    SKU: F261MAH-V01C Johnson Controls
    SKU: F261MAH-V01C
    Brand: Johnson Controls
    (6)
    $162.84 each
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    58
    Tue, Nov 2
    58
    QtyArrives
    58 Tue, Nov 2
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  • Brass Flow Switch NEMA4 Flexible w/ Paddles<br>(Small Turning Radius) Product Image
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    Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius) IFSWSBF-1 Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius)
    SKU: IFSWSBF-1 Taco
    SKU: IFSWSBF-1
    Brand: Taco
    (1)
    $174.21 each
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    61
    Tue, Nov 2
    69
    QtyArrives
    61 Tue, Nov 2
    8 Wed, Nov 3 – Thu, Nov 4
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  • Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V) Product Image
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    Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V) 9036DG2R Liquid Level Switch w/ Reverse Lever, Open On Rise, NEMA 1 (460V)
    SKU: 9036DG2R Square D
    SKU: 9036DG2R
    Brand: Square D
    (1)
    $38.68 each
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    39
    Tue, Nov 2
    39
    QtyArrives
    39 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • FS5-3/4, 3/4" Flow Switch Product Image
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    FS5-3/4, 3/4" Flow Switch 114760 FS5-3/4, 3/4" Flow Switch
    SKU: 114760 Mcdonnell & Miller
    SKU: 114760
    Brand: Mcdonnell & Miller
    (3)
    $225.87 each
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    40
    Tue, Nov 2
    40
    QtyArrives
    40 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • Alternator Liquid Level Switch (NEMA 1) Product Image
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    Alternator Liquid Level Switch (NEMA 1) 9038CG36 Alternator Liquid Level Switch (NEMA 1)
    SKU: 9038CG36 Square D
    SKU: 9038CG36
    Brand: Square D
    $319.64 each
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    53
    Tue, Nov 2
    53
    QtyArrives
    53 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • 2-1/2" NPT Liquid Level Float Switch Product Image
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    2-1/2" NPT Liquid Level Float Switch 9037HG33 2-1/2" NPT Liquid Level Float Switch
    SKU: 9037HG33 Square D
    SKU: 9037HG33
    Brand: Square D
    (2)
    $120.58 each
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    93
    Tue, Nov 2
    93
    QtyArrives
    93 Tue, Nov 2
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  • Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V) Product Image
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    Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V) 9037HG32LZ20 Liquid Level Switch w/ Viton Packing & Rod, Close On Rise, Left Float (600V)
    SKU: 9037HG32LZ20 Square D
    SKU: 9037HG32LZ20
    Brand: Square D
    $85.66 each
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    37
    Tue, Nov 2
    37
    QtyArrives
    37 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • 1" NPT Male Universal Flow Switch Product Image
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    1" NPT Male Universal Flow Switch 626600A 1" NPT Male Universal Flow Switch
    SKU: 626600A Caleffi
    SKU: 626600A
    Brand: Caleffi
    $132.45 each
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    29
    Tue, Nov 2
    29
    QtyArrives
    29 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • 1" Brass Flow Switch w/ Rigid Paddles (Single Switch) Product Image
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    1" Brass Flow Switch w/ Rigid Paddles (Single Switch) IFS01BR-1 1" Brass Flow Switch w/ Rigid Paddles (Single Switch)
    SKU: IFS01BR-1 Taco
    SKU: IFS01BR-1
    Brand: Taco
    (1)
    $149.65 each
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    38
    Tue, Nov 2
    47
    QtyArrives
    38 Tue, Nov 2
    9 Wed, Nov 3 – Thu, Nov 4
    Questions? Call 1-888-757-4774
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  • Float Switch w/ Rod/Float, Reverse Action, Open On Rise, Right Float (600V) Product Image
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    Float Switch w/ Rod/Float, Reverse Action, Open On Rise, Right Float (600V) 9037HG33R Float Switch w/ Rod/Float, Reverse Action, Open On Rise, Right Float (600V)
    SKU: 9037HG33R Square D
    SKU: 9037HG33R
    Brand: Square D
    $91.99 each
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    36
    Tue, Nov 2
    36
    QtyArrives
    36 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • FS1, 1/2" Flow Switch Product Image
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    FS1, 1/2" Flow Switch 113200 FS1, 1/2" Flow Switch
    SKU: 113200 Mcdonnell & Miller
    SKU: 113200
    Brand: Mcdonnell & Miller
    (3)
    $209.27 each
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    44
    Tue, Nov 2
    44
    QtyArrives
    44 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • FS4-15SS, Stainless Steel Paddle Kit<br>w/ 1", 2" 3", & 6" Paddle Product Image
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    FS4-15SS, Stainless Steel Paddle Kit w/ 1", 2" 3", & 6" Paddle 310451 FS4-15SS, Stainless Steel Paddle Kit w/ 1", 2" 3", & 6" Paddle
    SKU: 310451 Mcdonnell & Miller
    SKU: 310451
    Brand: Mcdonnell & Miller
    (1)
    $15.95 each
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    68
    Tue, Nov 2
    68
    QtyArrives
    68 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V) Product Image
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    Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V) 9038AG1 Alternator Switch, 2-Pole, Flange Mount, Close on Rise, NEMA 1 (600V)
    SKU: 9038AG1 Square D
    SKU: 9038AG1
    Brand: Square D
    $92.53 each
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    37
    Tue, Nov 2
    37
    QtyArrives
    37 Tue, Nov 2
    Questions? Call 1-888-757-4774
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  • 1" Liquid Flow Switch (SS Paddles) Product Image
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    1" Liquid Flow Switch (SS Paddles) F261MAL-V01C 1" Liquid Flow Switch (SS Paddles)
    SKU: F261MAL-V01C Johnson Controls
    SKU: F261MAL-V01C
    Brand: Johnson Controls
    $228.84 each
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    26
    Tue, Nov 2
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    26 Tue, Nov 2
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  • Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection Product Image
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    Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection 9038DG8 Alternator Liquid Level Switch, 2.63" Hinge Post, 5-1/8" Tank Connection
    SKU: 9038DG8 Square D
    SKU: 9038DG8
    Brand: Square D
    $418.58 each
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    18
    Tue, Nov 2
    18
    QtyArrives
    18 Tue, Nov 2
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  • FS5-1, 1" Flow Switch Product Image
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    FS5-1, 1" Flow Switch 114780 FS5-1, 1" Flow Switch
    SKU: 114780 Mcdonnell & Miller
    SKU: 114780
    Brand: Mcdonnell & Miller
    (6)
    $215.92 each
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    20
    Tue, Nov 2
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    20 Tue, Nov 2
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  • 3/4" NPT Flow Switch<br>Low Flow Product Image
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    3/4" NPT Flow Switch Low Flow F261KFH-V01C 3/4" NPT Flow Switch Low Flow
    SKU: F261KFH-V01C Johnson Controls
    SKU: F261KFH-V01C
    Brand: Johnson Controls
    (8)
    $146.69 each
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    12
    Tue, Nov 2
    12
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    12 Tue, Nov 2
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  • Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V) Product Image
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    Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V) 9037EG9 Flange Mounted Liquid Level Switch, Close On Rise, 2-1/16" Float Travel (575V)
    SKU: 9037EG9 Square D
    SKU: 9037EG9
    Brand: Square D
    $176.18 each
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    39
    Tue, Nov 2
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    QtyArrives
    39 Tue, Nov 2
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  • Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V) Product Image
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    Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V) 9037HG32 Liquid Level Switch w/ Rod & Float, Close On Rise, Left Float Position (600V)
    SKU: 9037HG32 Square D
    SKU: 9037HG32
    Brand: Square D
    $145.99 each
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    78
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    78 Tue, Nov 2
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FAQs, Manuals & Videos

Resources

Articles

  • A flow switch is an instrument that monitors the flow of steam, air, or liquid. The flow switch sends a signal to a device, such as a pump, to turn on or shut off. Flow switches can be used for air conditioning, heating and hydronic systems, among other applications.

    Air flow switches are used in applications that require low to high velocity, providing an economical way to detect change or loss of air flow velocity. This change or loss may be caused by a closed damper or fan inlet, loose fan wheel, slipped or broken fan belt, dirty or clogged filter, or an overload on a fan motor switch.

    Liquid flow switches have a universal design and serve a wider range of applications, such as starting or stopping electrically operated equipment like signal lights, alarms, motors, and automatic burners. In addition, liquid flow switches are used for general purpose applications with environmental exposure or applications requiring a water-tight or dust-tight flow switch. The liquid-flow F61 Series flow switch, manufactured by Johnson Controls, responds to fluid flow in lines carrying water, ethylene glycol, or other nonhazardous fluids. It also responds to low fluid flow rates in applications with pipe sizes under 1" trade size.

    Our website offers a vast selection of McDonnell & Miller Johnson Controls, Watts. and Taco flow switches that suit a wide range of residential, commercial, and industrial applications.
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