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Flow Switches

  • 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
    (13)
    $97.95 each
    $284.85 box of 3
    $94.95 each
    370
    Mon, Oct 28
    370
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    370 Mon, Oct 28
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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
    SKU: 114400
    Brand: Mcdonnell & Miller
    (4)
    $115.95 each
    $335.85 box of 3
    $111.95 each
    586
    Mon, Oct 28
    586
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    586 Mon, Oct 28
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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
    (6)
    $168.95 each
    $488.85 box of 3
    $162.95 each
    160
    Mon, Oct 28
    160
    QtyArrives
    160 Mon, Oct 28
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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
    $105.95 each
    $299.85 box of 3
    $99.95 each
    189
    Mon, Oct 28
    189
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    189 Mon, Oct 28
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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
    (3)
    $149.95 each
    $431.85 box of 3
    $143.95 each
    69
    Mon, Oct 28
    69
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    69 Mon, Oct 28
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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
    (3)
    $109.99 each
    $317.37 box of 3
    $105.79 each
    42
    Mon, Oct 28
    66
    QtyArrives
    42 Mon, Oct 28
    24 Tue, Oct 29 – Wed, Oct 30
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  • Air Flow Pressure Sensing Switch (.1/10"W.C.) Product Image
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    Air Flow Pressure Sensing Switch (.1/10"W.C.) NS2-0000-00 Air Flow Pressure Sensing Switch (.1/10"W.C.)
    SKU: NS2-0000-00
    Brand: Cleveland Controls
    (1)
    $19.99 each
    62
    Mon, Oct 28
    62
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    62 Mon, Oct 28
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  • OEM Pressure Sensing Switch (.25/1.0" W.C.) Product Image
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    OEM Pressure Sensing Switch (.25/1.0" W.C.) RSS-495-011 OEM Pressure Sensing Switch (.25/1.0" W.C.)
    SKU: RSS-495-011
    Brand: Cleveland Controls
    (4)
    $23.99 each
    25
    Mon, Oct 28
    25
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    25 Mon, Oct 28
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  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
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    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.) AFS-222-112 SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-222-112
    Brand: Cleveland Controls
    (4)
    $29.19 each
    45
    Mon, Oct 28
    45
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    45 Mon, Oct 28
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  • JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey) Product Image
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    JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey) JD-2-GREY JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey)
    SKU: JD-2-GREY
    Brand: Antunes
    $58.49 each
    438
    Mon, Oct 28
    438
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    438 Mon, Oct 28
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  • JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue) Product Image
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    JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue) JD-2-BLUE JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue)
    SKU: JD-2-BLUE
    Brand: Antunes
    (1)
    $66.99 each
    578
    Mon, Oct 28
    578
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    578 Mon, Oct 28
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  • Pressure Switch .05" WC Product Image
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    Pressure Switch .05" WC DFS-221-347 Pressure Switch .05" WC
    SKU: DFS-221-347
    Brand: Cleveland Controls
    (1)
    $32.49 each
    16
    Mon, Oct 28
    16
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    16 Mon, Oct 28
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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)
    $179.95 each
    $518.85 box of 3
    $172.95 each
    90
    Mon, Oct 28
    90
    QtyArrives
    90 Mon, Oct 28
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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)
    $192.95 each
    $557.85 box of 3
    $185.95 each
    51
    Mon, Oct 28
    51
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    51 Mon, Oct 28
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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
    54
    Mon, Oct 28
    54
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    54 Mon, Oct 28
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  • SPDT Air Pressure Sensing Switch<br>(.05" - 12.0" W.C.) Product Image
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    SPDT Air Pressure Sensing Switch (.05" - 12.0" W.C.) AFS-A SPDT Air Pressure Sensing Switch (.05" - 12.0" W.C.)
    SKU: AFS-A
    Brand: Cleveland Controls
    $30.99 each
    51
    Mon, Oct 28
    51
    QtyArrives
    51 Mon, Oct 28
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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
    (5)
    $192.95 each
    $557.85 box of 3
    $185.95 each
    52
    Mon, Oct 28
    52
    QtyArrives
    52 Mon, Oct 28
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  • SPDT Air Pressure Switch Barbed Connector<br>(.05" W.C.) Product Image
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    SPDT Air Pressure Switch Barbed Connector (.05" W.C.) DFS-221-112 SPDT Air Pressure Switch Barbed Connector (.05" W.C.)
    SKU: DFS-221-112
    Brand: Cleveland Controls
    $23.19 each
    71
    Mon, Oct 28
    71
    QtyArrives
    71 Mon, Oct 28
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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
    15
    Mon, Oct 28
    23
    QtyArrives
    15 Mon, Oct 28
    8 Tue, Oct 29 – Wed, Oct 30
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  • FS-200-W NEMA-1 Paddle-Type Flow Switch Product Image
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    FS-200-W NEMA-1 Paddle-Type Flow Switch 00063067 FS-200-W NEMA-1 Paddle-Type Flow Switch
    SKU: 00063067
    Brand: Watts
    $199.99 each
    $383.38 box of 2
    $191.69 each
    19
    Mon, Oct 28
    19
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    19 Mon, Oct 28
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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
    29
    Mon, Oct 28
    29
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    29 Mon, Oct 28
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  • SPDT General Purpose<br>Air Sensing Switch<br>(.05" to 12.0" W.C.) Product Image
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    SPDT General Purpose Air Sensing Switch (.05" to 12.0" W.C.) AFS-222-121 SPDT General Purpose Air Sensing Switch (.05" to 12.0" W.C.)
    SKU: AFS-222-121
    Brand: Cleveland Controls
    (1)
    $28.69 each
    101
    Mon, Oct 28
    101
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    101 Mon, Oct 28
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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
    $31.99 each
    24
    Mon, Oct 28
    24
    QtyArrives
    24 Mon, Oct 28
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  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
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    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.) AFS-145 SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-145
    Brand: Cleveland Controls
    (1)
    $27.59 each
    59
    Mon, Oct 28
    59
    QtyArrives
    59 Mon, Oct 28
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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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