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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Activation Distances for HW-5052-L Formed Reed Switch

Operate and release distances for the HW-5052-L reed switch of cropped/soldered formation in standard AT bands when actuated (as shown in the sketch) with NdFeB standard magnets is shown below. All distances given are in mm with tolerances of ±0.5mm.  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 can be done by going through our AT band FAQ and our magnet selection guide.

HW-5052 cropped reed switch dimension
HW-5052 cropped reed switch dimension
All dimensions are in mm

HW-5052-L (40-50 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 NA NA
NDR-S 6.0 x 2.5 x 2.5 1.0 – 2.5 3.0 – 5.0
NDR-M  8.0 x 3.0 x 3.0 3.5 -5.5 7.0 – 9.0
NDR-L 19.0 x 4.0 x 4.0 14.0 – 17.5 20.0 – 24.0
NDC-T Φ2.0 x 4.0 NA NA
NDC-S Φ3.0 x 7.0 2.0 – 3.0 4.0 – 6.0
NDC-M Φ4.0 x 10 7.0 – 10.0 12.0 – 14.5
NDC-L Φ8.0 x 15.0 25.0 – 29.0 34.0 – 38.0

HW-5052-L (50-60 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 NA NA
NDR-S 6.0 x 2.5 x 2.5 0.5 – 1.0 3.0 – 4.0
NDR-M 8.0 x 3.0 x 3.0 3.0 – 3.5 7.0 – 8.0
NDR-L 19.0 x 4.0 x 4.0 12.0 – 14.0 20.5 – 21.0
NDC-T Φ2.0 x 4.0 NA NA
NDC-S Φ3.0 x 7.0  1.0 – 2.0 4.0 – 5.0
NDC-M Φ4.0 x 10 6.0 – 8.0 12.0 – 13.0
NDC-L Φ8.0 x 15.0 22.0 – 25.0 33.0 – 34.0

HW-5052-L (60-70 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 NA NA
NDR-S 6.0 x 2.5 x 2.5 0 – 0.5 3.0 – 3.5
NDR-M 8.0 x 3.0 x 3.0 2.5 – 3.0 6.0 – 7.0
NDR-L 19.0 x 4.0 x 4.0  11.0 – 12.0 19.0 – 21.0
NDC-T Φ2.0 x 4.0 NA NA
NDC-S Φ3.0 x 7.0 0.5 – 1.0 3.0 – 4.0
NDC-M Φ4.0 x 10  5.0 – 6.0 10.5 – 12.0
NDC-L Φ8.0 x 15.0  20.0 – 23.0 31.0 – 33.0

HW-5052-L (70-80 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 NA NA
NDR-S 6.0 x 2.5 x 2.5 NA NA
NDR-M 8.0 x 3.0 x 3.0 1.5 – 2.5 6.0 – 7.0
NDR-L 19.0 x 4.0 x 4.0 10.0 – 11.0 19.0 – 20.0
NDC-T Φ2.0 x 4.0 NA NA
NDC-S Φ3.0 x 7.0 0 – 0.5 3.0 – 3.5
NDC-M Φ4.0 x 10 4.5 – 5.0 11.0 – 12.0
NDC-L Φ8.0 x 15.0 19.0 – 20.0 32.0 – 33.0

HW-5052-L (80-85 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
cropped reed switch actuation distance
NDR-T 4.0 x 1.5 x 1.5 NA NA
NDR-S 6.0 x 2.5 x 2.5 NA NA
NDR-M 8.0 x 3.0 x 3.0 1.0 – 1.5  6.0 – 7.0
NDR-L 19.0 x 4.0 x 4.0 10.0 -11.0 17.0 – 20.0
NDC-T Φ2.0 x 4.0 NA NA
NDC-S Φ3.0 x 7.0 NA NA
NDC-M Φ4.0 x 10 4.0 – 4.5 10.5 – 11.0
NDC-L Φ8.0 x 15.0 18.0 – 9.0 28.0 – 33.0