Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971
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Actuation Distances for MO-1422 Reed Switches

Actuation distances for MO-1422 reed switches of cropped, SMD, Horizontal Mount and Vertical Mount formations in standard AT bands when actuated (as shown in the sketch) using our standard NdFeB magnets are shown below. All distances given are in mm and standard tolerances of ±0.5mm apply.  Although some of the AT band / magnet combinations will produce similar actuating distances, selecting the right AT band and magnet for an application is important and our AT band FAQ and magnet selection guide will help with this.

Activation Distances for MO-1422 cropped Reed Switch

MO-1422 Miniature off-center cropped reed switch dimension
MO-1422 Cropped Reed switch dimension
All dimensions are in mm

MO-1422 (15-25 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 1.0 – 2.5 2.0 – 3.0
NDR-S 6.0 x 2.5 x 2.5 5.0 – 7.0 6.0 – 7.5
NDR-M 8.0 x 3.0 x 3.0 7.5 – 10.0 9.0 – 11.0
NDR-I 12.0 x 3.5 x 3.5 10.5 – 13.5 12.0 – 14.5
NDR-L 19.0 x 4.0 x 4.0 14.0 – 18.0 16.5 – 19.0
NDC-T Φ2.0 x 4.0 1.5 – 3.5 2.5 – 4.0
NDC-S Φ3.0 x 7.0 6.5 – 8.5 8.0 – 9.0
NDC-M Φ4.0 x 10 9.5 – 12.5 11.0 – 13.5
NDC-I Φ6.0 x 12.0 15.5 – 20.0 18.0 – 21.0
NDC-L Φ8.0 x 15.0 21.0 – 26.0 24.0 – 28.0

MO-1422 (25-35 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 0.5 – 1.0 1.5 – 2.0
NDR-S 6.0 x 2.5 x 2.5 4.0 – 5.0 5.5 – 6.0
NDR-M 8.0 x 3.0 x 3.0 6.5 – 7.5 8.5 – 9.0
NDR-I 12.0 x 3.5 x 3.5 9.5 – 10.5 11.0 – 12.0
NDR-L 19.0 x 4.0 x 4.0 12.0 – 14.0 15.5 – 16.5
NDC-T Φ2.0 x 4.0 1.0 – 1.5 2.0 – 2.5
NDC-S Φ3.0 x 7.0 5.0 – 6.5 7.0 – 8.0
NDC-M Φ4.0 x 10 8.0 – 9.5 10.0 – 11.0
NDC-I Φ6.0 x 12.0 13.5 – 15.5 17.0 – 18.0
NDC-L Φ8.0 x 15.0 19.0 – 21.0 23.0 – 24.0

MO-1422 (35-45 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 3.5 – 4.0 5.5 – 5.5
NDR-M 8.0 x 3.0 x 3.0 5.5 – 6.5 8.0 – 8.5
NDR-I 12.0 x 3.5 x 3.5 8.5 – 9.5 10.5 – 11.0
NDR-L 19.0 x 4.0 x 4.0 11.0 – 12.0 14.5 – 15.5
NDC-T Φ2.0 x 4.0 0.5 – 1.0 2.0 – 2.5
NDC-S Φ3.0 x 7.0 4.5 – 5.0 6.0 – 7.0
NDC-M Φ4.0 x 10 7.5 – 8.0 9.5 – 10.0
NDC-I Φ6.0 x 12.0 12.5 – 13.5 16.5 – 17.0
NDC-L Φ8.0 x 15.0 18.0 – 19.0 22.0 – 23.0

MO-1422 (45-50 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 3.0 – 3.5 4.0 – 5.0
NDR-M 8.0 x 3.0 x 3.0 5.0 – 5.5 7.0 – 8.0
NDR-I 12.0 x 3.5 x 3.5 8.0 – 8.5 10.0 – 10.5
NDR-L 19.0 x 4.0 x 4.0 10.5 – 11.0 14.5 – 15.0
NDC-T Φ2.0 x 4.0 N/A N/A
NDC-S Φ3.0 x 7.0 4.0 – 4.5 5.0 – 6.0
NDC-M Φ4.0 x 10 7.0 – 7.5 9.0 – 9.5
NDC-I Φ6.0x 12.0 12.0 – 12.5 16.0 – 16.5
NDC-L Φ8.0 x 15.0 17.5 – 18.0 21.0 – 22.0

Activation Distances for MO-1422 SMD Reed Switch

MO-1422 miniature off-center SMD reed switch dimension
MO-1422 SMD Reed switch dimension
All dimensions in mm

MO-1422 (15-25 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
SMD formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5  1.5 – 2.0 2.0 – 2.5
NDR-S 6.0 x 2.5 x 2.5 5.0 – 6.5 6.0 – 7.0
NDR-M 8.0 x 3.0 x 3.0 8.5 – 9.5 10.0 – 10.5
NDR-I 12.0 x 3.5 x 3.5 11.0 – 13.0 13.0 – 14.0
NDR-L 19.0 x 4.0 x 4.0 15.0 – 17.0 17.5 – 18.0
NDC-T Φ2.0 x 4.0 2.0 – 2.5 2.5 – 3.0
NDC-S Φ3.0 x 7.0 6.5 – 8.0 8.0 – 8.5
NDC-M Φ4.0 x 10 10.0 – 12.0 12.0 – 13.0
NDC-I Φ6.0 x 12.0 17.0 – 18.5 19.5 – 20.0
NDC-L Φ8.0 x 15.0 22.0 – 26.5 25.0 – 27.5

MO-1422 (25-35 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
SMD formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5  1.0 – 1.5  1.5 – 2.0
NDR-S 6.0 x 2.5 x 2.5 4.0 – 5.0 5.5 – 6.0
NDR-M 8.0 x 3.0 x 3.0  7.0 – 8.5 9.0 – 10.0
NDR-I 12.0 x 3.5 x 3.5 10.0 – 11.0 12.0 – 13.0
NDR-L 19.0 x 4.0 x 4.0 12.5 – 15.0 16.0 – 17.5
NDC-T Φ2.0 x 4.0 1.5 – 2.0 2.0 – 2.5
NDC-S Φ3.0 x 7.0 5.0 – 6.5 7.0 – 8.0
NDC-M Φ4.0 x 10 9.0 – 10.0 11.0 – 12.0
NDC-I Φ6.0 x 12.0  14.0 – 17.0 18.0 – 19.5
NDC-L Φ8.0 x 15.0 20.0 – 22.0 24.0 – 25.0

MO-1422 (35-45 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
SMD formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 0.5 – 1.0  1.5 – 2.0
NDR-S 6.0 x 2.5 x 2.5 3.5 – 4.0 5.0 – 5.5
NDR-M 8.0 x 3.0 x 3.0 6.0 – 7.0 8.5 – 9.0
NDR-I 12.0 x 3.5 x 3.5 9.0 – 10.0 11.5 – 12.0
NDR-L 19.0 x 4.0 x 4.0 11.0 – 12.5 15.5 – 16.0
NDC-T Φ2.0 x 4.0 1.0 – 1.5 2.0 – 2.5
NDC-S Φ3.0 x 7.0 4.0 – 5.0 6.5 – 7.0
NDC-M Φ4.0 x 10 7.0 – 9.0 10.5 – 11.0
NDC-I Φ6.0 x 12.0 13.5 – 14.0 17.5 – 18.0
NDC-L Φ8.0 x 15.0 18.0 – 20.0 23.0 – 24.0

MO-1422 (45-50 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
SMD formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 3.0 – 3.5 4.5 – 5.0
NDR-M 8.0 x 3.0 x 3.0 5.5 – 6.0 8.0 – 8.5
NDR-I 12.0 x 3.5 x 3.5 8.5 – 9.0 11.0 – 11.5
NDR-L 19.0 x 4.0 x 4.0 10.5 – 11.0 14.5 – 15.5
NDC-T Φ2.0 x 4.0  0.5 – 1.0 1.5 – 2.0
NDC-S Φ3.0 x 7.0 4.0 – 4.5 6.0 – 6.5
NDC-M Φ4.0 x 10 6.5 – 7.0 10.0 – 10.5
NDC-I Φ6.0 x 12.0 13.0 – 13.5 17.0 – 17.5
NDC-L Φ8.0 x 15.0 17.0 – 18.0 22.0 – 23.0

 

Activation Distances for MO-1422 Horizontal Mount Reed Switch

MO-1422 miniature off-center horizontal mount reed switch dimension
MO-1422 Horizontal Mount Reed switch dimension
All dimensions in mm

MO-1422 (15-25 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Goal-post formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 1.5 – 2.0 2.0 – 2.5
NDR-S 6.0 x 2.5 x 2.5 5.0 – 6.0 6.5 – 7.0
NDR-M 8.0 x 3.0 x 3.0 8.0 – 10.0 10.0 – 11.0
NDR-I 12.0 x 3.5 x 3.5 11.0 – 13.0 13.5 – 14.5
NDR-L 19.0 x 4.0 x 4.0 15.0 – 18.0 19.0 – 20.0
NDC-T Φ2.0 x 4.0 2.0 – 2.5 2.5 – 3.5
NDC-S Φ3.0 x 7.0 6.0 – 8.0 8.0 – 9.0
NDC-M Φ4.0 x 10 10.0 – 12.0 12.5 – 13.5
NDC-I Φ6.0 x 12.0 16.0 – 20.0 20.0 – 22.0
NDC-L Φ8.0 x 15.0 23.0 – 26.0 28.0 – 29.0

MO-1422 (25-35 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Goal-post formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 0.5 – 1.5 1.0 – 2.0
NDR-S 6.0 x 2.5 x 2.5 3.5 – 5.0 4.5 – 6.5
NDR-M 8.0 x 3.0 x 3.0 6.0 – 8.0 8.0 – 10.0
NDR-I 12.0 x 3.5 x 3.5 9.0 – 11.0 11.0 – 13.5
NDR-L 19.0 x 4.0 x 4.0 11.0 – 15.0 14.5 – 19.0
NDC-T Φ2.0 x 4.0 1.0 – 2.0 1.5 – 2.5
NDC-S Φ3.0 x 7.0 4.5 – 6.0 6.0 – 8.0
NDC-M Φ4.0 x 10 8.0 – 10.0 10.0 – 12.5
NDC-I Φ6.0 x 12.0 13.5 – 16.0 16.5 – 20.0
NDC-L Φ8.0 x 15.0 19.0 – 23.0 23.0 – 28.0

MO-1422 (35-45 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Goal-post formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5  N/A N/A
NDR-S 6.0 x 2.5 x 2.5 3.0 – 3.5 4.5 – 5.0
NDR-M 8.0 x 3.0 x 3.0 5.5 – 6.0 7.5 – 8.0
NDR-I 12.0 x 3.5 x 3.5 8.5 – 9.0 10.5 – 11.0
NDR-L 19.0 x 4.0 x 4.0 10.5 – 11.0 13.5 – 14.5
NDC-T Φ2.0 x 4.0  0.5 – 1.0 1.0 – 1.5
NDC-S Φ3.0 x 7.0 4.0 – 4.5 5.5 – 6.0
NDC-M Φ4.0 x 10 7.5 – 8.0 9.5 – 10.0
NDC-I Φ6.0 x 12.0 12.5 – 13.5 15.5 – 16.5
NDC-L Φ8.0 x 15.0 18.0 – 19.0 22.0 – 23.0

MO-1422 (45-50 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Goal-post formed reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5  N/A N/A
NDR-S 6.0 x 2.5 x 2.5  2.5 – 3.0  4.0 – 4.5
NDR-M 8.0 x 3.0 x 3.0 4.5 – 5.5 7.0 – 7.5
NDR-I 12.0 x 3.5 x 3.5 8.0 – 8.5 10.0 – 10.5
NDR-L 19.0 x 4.0 x 4.0 10.0 – 10.5 13.0 – 13.5
NDC-T Φ2.0 x 4.0  N/A N/A
NDC-S Φ3.0 x 7.0 3.5 – 4.0 5.0 – 5.5
NDC-M Φ4.0 x 10 7.0 – 7.5 9.0 – 9.5
NDC-I Φ6.0 x 12.0 12.0 – 12.5 15.0 – 15.5
NDC-L Φ8.0 x 15.0 17.0 – 18.0 21.0 – 22.0

 

Activation Distances for MO-1422 Vertical Mount Reed Switch

MO-1422 miniature off-center vertical mount reed switch dimension
MO-1422 Vertical Mount Reed switch dimension
All dimensions in mm

MO-1422 (15-25 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Welded reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 1.5 – 2.5 2.0 – 3.0
NDR-S 6.0 x 2.5 x 2.5 5.0 –  7.0 6.0 – 8.0
NDR-M 8.0 x 3.0 x 3.0 8.0 – 11.0 10.0 – 12.5
NDR-I 12.0 x 3.5 x 3.5 11.0 – 14.5 13.0 – 16.0
NDR-L 19.0 x 4.0 x 4.0 14.0 – 19.0 16.0 – 21.0
NDC-T Φ2.0 x 4.0 2.0 – 3.0 2.5 – 3.5
NDC-S Φ3.0 x 7.0 6.0 – 9.0 8.0 – 10.0
NDC-M Φ4.0 x 10 10.0 – 13.0 12.5 – 14.5
NDC-I Φ6.0 x 12.0 17.0 – 21.0 20.0 – 23.0
NDC-L Φ8.0 x 15.0 23.0 – 29.0 27.0 – 31.0

MO-1422 (25-35 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Welded reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5  1.0 – 1.5  1.5 – 3.0
NDR-S 6.0 x 2.5 x 2.5 4.5 – 5.0 5.5 – 6.0
NDR-M 8.0 x 3.0 x 3.0 7.5 – 8.0 9.5 – 10.0
NDR-I 12.0 x 3.5 x 3.5 10.0 – 11.0 12.5 – 13.5
NDR-L 19.0 x 4.0 x 4.0 13.0 – 14.0 15.0 – 16.0
NDC-T Φ2.0 x 4.0 1.5 – 2.0 2.0 – 2.5
NDC-S Φ3.0 x 7.0 5.5 – 6.0 7.0 – 8.0
NDC-M Φ4.0 x 10  9.0 – 10.0 11.0 – 12.5
NDC-I Φ6.0 x 12.0 15.0 – 17.0 19.0 – 20.0
NDC-L Φ8.0 x 15.0 21.0 – 23.0 25.0 – 27.0

MO-1422 (35-45 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Welded reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 0.5 – 1.0 1.0 – 1.5
NDR-S 6.0 x 2.5 x 2.5 4.0 – 4.5 5.0 – 5.5
NDR-M 8.0 x 3.0 x 3.0 6.5 – 7.5  9.0 – 9.5
NDR-I 12.0 x 3.5 x 3.5 9.5 – 10.0 12.0 – 12.5
NDR-L 19.0 x 4.0 x 4.0 12.0 – 13.0 14.0 – 15.0
NDC-T Φ2.0 x 4.0 1.0 – 1.5 1.5 – 2.0
NDC-S Φ3.0 x 7.0 5.0 – 5.5 6.5 – 7.0
NDC-M Φ4.0 x 10 8.5 – 9.0 10.5 – 11.0
NDC-I Φ6.0 x 12.0 13.5 – 15.0 18.0 – 19.0
NDC-L Φ8.0 x 15.0 19.0 – 21.0 24.0 – 25.0

MO-1422 (45-50 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
Welded reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 N/A N/A
NDR-S 6.0 x 2.5 x 2.5 3.0 – 4.0 4.5 – 5.0
NDR-M 8.0 x 3.0 x 3.0 6.0 – 6.5 8.5 – 9.0
NDR-I 12.0 x 3.5 x 3.5 8.5 – 9.5  11.5 – 12.0
NDR-L 19.0 x 4.0 x 4.0 10.0 – 12.0 13.5 – 14.0
NDC-T Φ2.0 x 4.0 0.5 – 1.5 1.0 – 1.5
NDC-S Φ3.0 x 7.0 4.5 – 5.0 6.0 – 6.5
NDC-M Φ4.0 x 10 7.0 – 8.5 10.0 – 10.5
NDC-I Φ6.0 x 12.0 12.0 – 13.5 17.5 – 18.0
NDC-L Φ8.0 x 15.0 17.0 – 19.0 23.0 – 24.0