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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
    Brand: Mcdonnell & Miller
    (14)
    $98.99 each
    332
    Fri, Jul 24
    332
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    332 Fri, Jul 24
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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
    Brand: Mcdonnell & Miller
    (4)
    $115.99 each
    437
    Fri, Jul 24
    437
    QtyArrives
    437 Fri, Jul 24
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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
    Brand: Taco
    (4)
    $111.99 each
    24
    Fri, Jul 24
    45
    QtyArrives
    24 Fri, Jul 24
    21 Tue, Jul 28 – Wed, Jul 29
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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
    Brand: Mcdonnell & Miller
    (7)
    $177.99 each
    71
    Fri, Jul 24
    71
    QtyArrives
    71 Fri, Jul 24
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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
    Brand: Johnson Controls
    $112.99 each
    96
    Fri, Jul 24
    96
    QtyArrives
    96 Fri, Jul 24
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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
    Brand: Johnson Controls
    (4)
    $154.99 each
    36
    Fri, Jul 24
    36
    QtyArrives
    36 Fri, Jul 24
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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
    Brand: Square D
    (1)
    $31.99 each
    Tue, Aug 4 – Fri, Aug 7
    Arrives
    Tue, Aug 4 – Fri, Aug 7
    Questions? Call 1-888-757-4774 or LiveChat Img Chat Us
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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
    Brand: Square D
    $249.99 each
    30
    Fri, Jul 24
    30
    QtyArrives
    30 Fri, Jul 24
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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
    Brand: Taco
    (1)
    $156.99 each
    21
    Fri, Jul 24
    38
    QtyArrives
    21 Fri, Jul 24
    17 Tue, Jul 28 – Wed, Jul 29
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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
    Brand: Mcdonnell & Miller
    (3)
    $189.99 each
    34
    Fri, Jul 24
    34
    QtyArrives
    34 Fri, Jul 24
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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
    Brand: Square D
    (2)
    $93.99 each
    74
    Fri, Jul 24
    74
    QtyArrives
    74 Fri, Jul 24
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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
    Brand: Square D
    $56.99 each
    21
    Fri, Jul 24
    21
    QtyArrives
    21 Fri, Jul 24
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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
    Brand: Mcdonnell & Miller
    (3)
    $171.99 each
    21
    Fri, Jul 24
    21
    QtyArrives
    21 Fri, Jul 24
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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
    Brand: Square D
    $235.99 each
    22
    Fri, Jul 24
    22
    QtyArrives
    22 Fri, Jul 24
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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
    Brand: Square D
    $95.99 each
    39
    Fri, Jul 24
    39
    QtyArrives
    39 Fri, Jul 24
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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
    Brand: Mcdonnell & Miller
    (6)
    $198.99 each
    33
    Fri, Jul 24
    33
    QtyArrives
    33 Fri, Jul 24
    Questions? Call 1-888-757-4774
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  • Open Liquid Level Switch, Close On Rise, NEMA 1 (460V) Product Image
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    Open Liquid Level Switch, Close On Rise, NEMA 1 (460V) 9036DG2 Open Liquid Level Switch, Close On Rise, NEMA 1 (460V)
    SKU: 9036DG2
    Brand: Square D
    $32.99 each
    40
    Fri, Jul 24
    40
    QtyArrives
    40 Fri, Jul 24
    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
    Brand: Johnson Controls
    $174.99 each
    18
    Fri, Jul 24
    18
    QtyArrives
    18 Fri, Jul 24
    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
    Brand: Taco
    (1)
    $139.99 each
    15
    Fri, Jul 24
    20
    QtyArrives
    15 Fri, Jul 24
    5 Tue, Jul 28 – Wed, Jul 29
    Questions? Call 1-888-757-4774
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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
    Brand: Square D
    $99.99 each
    13
    Fri, Jul 24
    13
    QtyArrives
    13 Fri, Jul 24
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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
    Brand: Mcdonnell & Miller
    (1)
    $15.79 each
    33
    Fri, Jul 24
    33
    QtyArrives
    33 Fri, Jul 24
    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
    Brand: Caleffi
    $132.99 each
    8
    Fri, Jul 24
    8
    QtyArrives
    8 Fri, Jul 24
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  • Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V) Product Image
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    Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V) 9038CG32 Alternator Float Switch w/ Rod & Float, Close on Rise, NEMA 1, Left Float (600V)
    SKU: 9038CG32
    Brand: Square D
    (1)
    $215.99 each
    14
    Fri, Jul 24
    14
    QtyArrives
    14 Fri, Jul 24
    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
    Brand: Square D
    $115.99 each
    17
    Fri, Jul 24
    17
    QtyArrives
    17 Fri, Jul 24
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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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