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 R2B NC Reed Sensors

Release, operate and re-closure distances for the R2B-S Normally Closed SMD reed sensor in the three standard AT bands when actuated (as shown in the sketches) 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 magnet selection guide.

R2B-S-0 (5-10 AT)

Actuation Sketch Magnet Dimensions Release Distance Operate Distance Re-closure Zone
R2B magnet actuation
NDR-T 4.0 x 1.5 x 1.5 3.5 – 7.0  4.0 – 7.5 < 0.5
NDR-S 6.0 x 2.5 x 2.5  8.0 – 12.5 10.0 – 14.0 < 3.5
NDR-M 8.0 x 3.0 x 3.0  11.5 – 17.5 13.0 – 19.0 < 5.5
NDR-L 19.0 x 4.0 x 4.0  21.0 – 31.5 23.5 – 34.0 <8.0
NDC-T Φ2.0 x 4.0  4.0 – 7.5 5.0 – 8.0 < 1.0
NDC-S Φ3.0 x 7.0  10.0 – 15.0 11.0 – 16. < 3.5
NDC-M Φ4.0 x 10  15.0 – 22.0 17.0 – 23.0 < 7.0
NDC-L Φ8.0 x 15.0  30.0 – 45.0 34.0 – 48.0 < 15.0

R2B-S-1 (10-15 AT)

Actuation Sketch Magnet Dimensions Release Distance Operate Distance Re-closure Zone
R2B magnet actuation
NDR-T 4.0 x 1.5 x 1.5 2.0 – 4.0 2.5 – 4.5 < 0.5
NDR-S 6.0 x 2.5 x 2.5  6.5 – 9.0  7.0 – 10.0 < 3.0
NDR-M 8.0 x 3.0 x 3.0  9.5 – 12.5  10.0 – 13.5 <4 .5
NDR-L 19.0 x 4.0 x 4.0  17.0 – 21.5 18.0 – 23.0 < 7.0
NDC-T Φ2.0 x 4.0 2.5 – 5.0 3.0 – 5.5 < 1.0
NDC-S Φ3.0 x 7.0  8.0 – 10.5  9.0 – 11.0 < 3.5
NDC-M Φ4.0 x 10  12.0 – 16.0  13.0 – 17.0 < 5.0
NDC-L Φ8.0 x 15.0  26.0 – 32.0 27.0 – 33.0 < 12.0

R2B-S-2 (15-20 AT)

Actuation Sketch Magnet Dimensions Release Distance Operate Distance Re-closure Zone
R2B magnet actuation
NDR-T 4.0 x 1.5 x 1.5 1.5 – 2.5 2.0 – 3.0 < 0.5
NDR-S 6.0 x 2.5 x 2.5 5.0 – 7.0  5.5 – 8.0 < 2.5
NDR-M 8.0 x 3.0 x 3.0 8.0 – 10.0 8.5 – 11.0 < 4.0
NDR-L 19.0 x 4.0 x 4.0 14.5 – 18.0 15.0 – 19.0 < 6.0
NDC-T Φ2.0 x 4.0 2.0 – 3.0 2.5 – 3.5 < 1.0
NDC-S Φ3.0 x 7.0  6.5 – 8.5 7.0 – 9.5 < 3.0
NDC-M Φ4.0 x 10 10.0 – 12.5 10.5 – 14.0 < 5.0
NDC-L Φ8.0 x 15.0 22.5 – 26.5 22.5 – 28.5 < 10.0