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SW-21 Compact Magnetic Switch

Same as SW-11 Magnetic Switch, SW-21 is also an ideal accessory when combines with Flap-11 Magnetic Level Indicator, so that the Magnetic Level Indicator can realize the remote alarm function. 

● Designed in a compact lightweight structure, with size of 35mm in width and 120mm in length

● Adopted high-power reed of international well-known brand

  Made of 304 stainless steel

● Flame-proof with Ex d IIC T6 and Intrinsically-safe with Ex ia IIC T6

● Ingress Protection Level: IP66/67


  • The compact and lightweight designs are the most prominent features of SW-21 Compact Magnetic Switch (with size of 35mm in width and 120mm in length). SW-21 is with dual explosion-proof certifications (Flame-proof with Ex d IIC T6 and Intrinsically-safe with Ex ia IIC T6), and the core component uses the high-power reed of international well-known brand. The product applied for an utility patent (NO. 201821348285.8). 


    SW-21 Compact Magnetic Switch is designed with single-pole double-throw (SPDT) type, provides three types output of SPDT closure & disconnection, initial disconnection/closure hold and initial closure/disconnection hold, used for high alarm type (anti-overflow) or low alarm type (anti-rotation).

  • Same as SW-11 Magnetic Switch, SW-21 is also an ideal accessory when combines with Flap-11 Magnetic Level Indicator, so that the Magnetic Level Indicator can realize the remote alarm function. When the magnetic float in the buoy rises and falls by the changing of the liquid level, the permanent magnetic steel in magnetic float approaches the magnetic switch, and stimulates the switches to trigger the status of reed switch to change, and the on/off state of the reed is locked by the internal magnet and providing a signal to the control system to realize the liquid level control.


  •  Designed in a compact lightweight structure, with size of 35mm in width and 120mm in length

     Adopted high-power reed of international well-known brand

     Made of 304 stainless steel

     Flame-proof with Ex d IIC T6 and Intrinsically-safe with Ex ia IIC T6

     Ingress Protection Level: IP66/67

  • Output Type

    Switch signal (with memory function)

    Switch contact capacity

    220VAC,1.0/2.0A

    24VDC,1.5/2.5A

    Process temperature

    -50150

    Ambient temperature

    -4070C

    Explosion-proof

    Flame-proof: Ex d IIC T6

    Intrinsically-safe: Ex ia IIC T6

    Ingress Protection rating

    IP66/67

    Cable entry

    M20x1.5

  • SW-21 is an ideal accessory when combines with Flap-11 Magnetic Level Indicator, so that the Magnetic Level Indicator can realize the remote alarm function.


  • SW-21 Compact Magnetic Switch


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