United Electric Controls J21K Series Differential Pressure Switch

Robust, NEMA 4X differential pressure switch

The J21K Series is simple to install and operate for alarm, safety and emergency shutdown applications requiring a higher switch sensitivity. It monitors the difference between two system pressures or vacuum using sealed, opposing bellows sensors. As an electromechanical switch, it can safely operate independently of the control system and switch reliably when called upon, free from potential communication errors or cyber concerns.

Typical applications that utilize the J21K Series include proof of flow, filter monitoring, vacuum pumps, chillers, and compressors.

Features
  • Welded bellows sensor provides leak-free protection
  • Precise on-off control through adjustable deadband option
  • Application versatility achieved through a variety of ranges and microswitches
J21K Series

7 items

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  • United Electric 21 Differential Pressure Switch J21K-254-9545
    J21K-254-9545

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 0-90 psid setpoint range, one SPDT, 15A@125/250/480 VAC, 7/8" dia. conduit hole, NEMA 4 encl., phosphor bronze bellows, 1/4" FNPT press. conn., internal adjust. w/o ref. dial
    Qty in Cart: 0
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  • United Electric 21 Differential Pressure Switch J21K-S150B-9519
    J21K-S150B

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 0-40 psid setpoint range, one SPDT, 15A@125/250/480 VAC, 7/8" dia. conduit hole, NEMA 4 encl., welded 316LSS bellows, 1/2" FNPT press. conn., internal adjust. w/o ref. dial
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  • United Electric 21 Differential Pressure Switch J21K-S127B
    J21K-S127B

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 30" Hg Vac-0 psid setpoint range, one SPDT, 15A@125/250/480 VAC, 7/8" dia. conduit hole, NEMA 4 encl., welded 316LSS bellows, 1/2" FNPT SS press. conn., internal adjust. w/o ref. dial
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  • United Electric 21 Differential Pressure Switch J21K-357
    J21K-357

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 0-70 psid setpoint range, one SPDT, 15A@125/250/480 VAC, 7/8" dia. conduit hole, NEMA 4 encl., welded 316LSS bellows, 1/4" FNPT press. conn., internal adjust. w/o ref. dial
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  • United Electric 21 Differential Pressure Switch J21K-254-1520
    J21K-254-1520

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 0-90 psid setpoint range, one SPDT, 15A@125/250/277 VAC, 7/8" dia. conduit hole, NEMA 4 encl., phosphor bronze bellows, 1/4" FNPT press. conn., adjustable deadband, internal adjust. w/o ref. dial
    Qty in Cart: 0
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  • United Electric 21 Differential Pressure Switch J21K-150
    J21K-150

    United Electric Controls

    Product Type: General Purpose Switches

    UE J21K Differential Pressure Switch, 0-40 psid setpoint range, one SPDT, 15A@125/250/480 VAC, 7/8" dia. conduit hole, NEMA 4 encl., brass bellows, 1/4" FNPT brass press. conn., internal adjust. w/o ref. dial
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    J21K-254

    United Electric Controls

    Product Type: General Purpose Switches

    United Electric
    Qty in Cart: 0
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