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 IR-xxxx Reed Sensors

Operate and release distances for the IR-xxxx reed sensor in the two 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. Distances given will vary if the reed sensor leads are cropped after soldering. 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.

IR-xxxx-1 (10-15 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
IR-XXXX magnet actuation
NDR-T 4.0 x 1.5 x 1.5 1.0 – 2.5 1.5 – 3.0
NDR-S 6.0 x 2.5 x 2.5 4.0 – 7.0 5.0 – 7.5
NDR-M 8.0 x 3.0 x 3.0 7.0 – 10.0 7.5 – 10.5
NDR-L 19.0 x 4.0 x 4.0 12.0 – 17.0 13.0 – 18.0
NDC-T Φ2.0 x 4.0 1.5 – 3.0 2.0 – 3.5
NDC-S Φ3.0 x 7.0 5.5 – 8.0 6.0 – 8.5
NDC-M Φ4.0 x 10 8.0 – 11.5 8.5 – 12.0
NDC-L Φ8.0 x 15.0 19.0 – 25.0 20.0 – 26.0

IR-xxxx-2 (15-20 AT)

Actuation Sketch Magnet Dimensions Operate Distance Release Distance
IR-XXXX magnet actuation
NDR-T 4.0 x 1.5 x 1.5 0.0 – 1.0 1.0 – 1.5
NDR-S 6.0 x 2.5 x 2.5 3.5 – 4.5 4.0 – 5.5
NDR-M 8.0 x 3.0 x 3.0 5.5 – 7.0 6.5 – 7.5
NDR-L 19.0 x 4.0 x 4.0 10.0 – 12.0 12.0 – 13.0
NDC-T Φ2.0 x 4.0 0.0 – 1.5 1.5 – 2.0
NDC-S Φ3.0 x 7.0 4.5 – 5.5 5.0 – 6.5
NDC-M Φ4.0 x 10 6.5 – 8.0 7.5 – 8.5
NDC-L Φ8.0 x 15.0 16.5 – 19.0 18.0 – 20.0