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SW-21 Compact Magnetic Switch

Same as SW-11 Magnetic Switch, SW-21 is also an ideal accessory when combined with Flap-11 Magnetic Level Indicator for remote alarm and control.

 It is skillfully configured, compact and lightweight.

 Purchased high quality high-power reed switch with higher current rating and longer service time as its key parts in international market.

 Made of 304 stainless steel for strong corrosion resistance and durability.

 Approved for explosion proof certifications, including Flameproof Enclosure (Ex d IIC T6) and Intrinsic Safety (Ex ia IIC T6).

 With high Ingress protection level IP66/IP67.

  • The compact and lightweight are the most prominent features of SW-21 Compact Magnetic Switch (with 35mm in width and 120mm in length). SW-21 has been approved for dual explosion-proof certifications (Flameproof Enclosure: Ex d IIC T6 and Intrinsic safety: Ex ia IIC T6). And high quality high-power reed switch is used as its core component. Jiwei holds a utility patent (NO. 201821348285.8) on SW-21. SW-21 is used with Flap-11 Magnetic Level Indicator for remote alarm as well. The magnetic float in the chamber rises or falls with the up and down of the liquid level in the vessel. When the magnetic float approaches the magnetic switch, the permanent magnetic steel in the magnetic float triggers the reed switch in SW-21 to change its open/close status. The state of the reed is locked by the internal magnetic mechanism to fulfill the alarm function.


    SW-21 Compact Magnetic Switch is designed with a single-pole double-throw (SPDT) reed switch. It supports three types of output: (1)SPDT closed or open, (2)initial open and closed hold and (3)initial closed and open hold for overflow or dry-run alarm and protection.

  • 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.


  •  Skillful configuration, compact and lightweight with delicate appearance.

     Purchased high quality high-power reed switches with higher current rating and longer service time in international market.

     Made of 304 stainless steel to provide corrosion resistance and durability.

     Approved for explosion proof certifications, including Flameproof Enclosure (Ex d IIC T6) and Intrinsic Safety (Ex ia IIC T6).

     With high Ingress protection level: IP66/IP67.

  • Output

    Switch signal (lockable)

    Power supply

    220V AC,1.0/2.0A

    24VD C,1.5/2.5A

    Switching capacity

    60VA

    Process temperature

    -50~150℃

    Ambient temperature

    -40~70℃

    Explosion-proof

    Flameproof Enclosure: Ex d IIC T6

    Intrinsic safety: Ex ia IIC T6

    Ingress Protection rating

    IP66/IP67

    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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