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Magnet Actuation Direction
Magnet Actuation Direction
Magnet Actuation Direction
Magnet Actuation Direction
For easy selection of AT band and Magnet for an application, we offer Actuation distances for the UM-0018-H Reed Switch in cropped, SMD and Vertical Mount formations. The various combinations of standard AT Bands and magnets are covered, from the lower AT bands to the higher AT bands. Each AT band lists distances when actuated with our standard magnets. Although some of the AT band / magnet combinations of the UM-0018-H Reed Switch will produce similar actuating distances, selecting the right AT band and magnet for an application is important. Our Usage Notes below addresses these topics.
All distances given are in mm and standard tolerances of ±0.5 mm apply.
Actuation Distances for Cropped Leads
Operate Band 7-12 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 4.5 | 3.0 – 5.0 |
| NDR-S | 6.0 x 2.5 x 2.5 | 7.5 – 9.0 | 8.0 – 9.5 |
| NDR-M | 8.0 x 3.0 x 3.0 | 9.0 – 12.0 | 10.0 – 12.5 |
| NDR-L | 19.0 x 4.0 x 4.0 | 15.5 – 20.5 | 17.0 – 21.0 |
| NDC-T | Ø2.0 x 4.0 | 3.5 – 5.5 | 4.0 – 6.0 |
| NDC-S | Ø3.0 x 7.0 | 8.0 – 10.0 | 9.0 – 11.0 |
| NDC-M | Ø4.0 x 10.0 | 12.0 – 15.5 | 13.0 – 16.0 |
| NDC-L | Ø8.0 x 15.0 | 23.0 – 30.0 | 25.0 – 30.5 |
Operate Band 12-17 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 2.0 – 3.0 | 3.0 – 3.5 |
| NDR-S | 6.0 x 2.5 x 2.5 | 5.5 – 7.5 | 6.0 – 8.0 |
| NDR-M | 8.0 x 3.0 x 3.0 | 8.0 – 9.0 | 9.0 – 10.5 |
| NDR-L | 19.0 x 4.0 x 4.0 | 13.5 – 15.5 | 15.0 – 17.0 |
| NDC-T | Ø2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 4.0 |
| NDC-S | Ø3.0 x 7.0 | 6.5 – 8.0 | 7.0 – 9.0 |
| NDC-M | Ø4.0 x 10.0 | 10.5 – 12.0 | 12.0 – 13.0 |
| NDC-L | Ø8.0 x 15.0 | 20.0 – 23.0 | 22.0 – 25.0 |
Actuation Distances for SMD Formed Leads
Operate Band 7-12 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 3.0 – 5.0 | 3.5 – 5.5 |
| NDR-S | 6.0 x 2.5 x 2.5 | 7.5 – 10.5 | 8.0 – 11.0 |
| NDR-M | 8.0 x 3.0 x 3.0 | 10.0 – 13.5 | 10.5 – 14.0 |
| NDR-L | 19.0 x 4.0 x 4.0 | 17.5 – 23.5 | 18.0 – 24.0 |
| NDC-T | Ø2.0 x 4.0 | 3.5 – 6.0 | 4.0 – 6.5 |
| NDC-S | Ø3.0 x 7.0 | 8.5 – 11.0 | 9.0 – 12.0 |
| NDC-M | Ø4.0 x 10.0 | 13.0 – 17.0 | 13.5 – 18.0 |
| NDC-L | Ø8.0 x 15.0 | 26.0 – 34.0 | 27.0 – 35.0 |
Operate Band 12-17 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 2.0 | 3.0 – 3.5 |
| NDR-S | 6.0 x 2.5 x 2.5 | 6.0 – 7.5 | 7.0 – 8.0 |
| NDR-M | 8.0 x 3.0 x 3.0 | 9.0 – 10.0 | 10.0 – 10.5 |
| NDR-L | 19.0 x 4.0 x 4.0 | 15.0 – 17.5 | 17.0 – 18.0 |
| NDC-T | Ø2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 4.0 |
| NDC-S | Ø3.0 x 7.0 | 7.0 – 8.5 | 8.0 – 9.0 |
| NDC-M | Ø4.0 x 10.0 | 11.0 – 13.0 | 12.5 – 13.5 |
| NDC-L | Ø8.0 x 15.0 | 22.0 – 26.0 | 25.0 – 27.0 |
Actuation Distances for Horizontal Mounting on PCBs
Operate Band 7-12 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | ||
| NDR-S | 6.0 x 2.5 x 2.5 | ||
| NDR-M | 8.0 x 3.0 x 3.0 | ||
| NDR-L | 19.0 x 4.0 x 4.0 | ||
| NDC-T | Ø2.0 x 4.0 | ||
| NDC-S | Ø3.0 x 7.0 | ||
| NDC-M | Ø4.0 x 10.0 | ||
| NDC-L | Ø8.0 x 15.0 |
Operate Band 12-17 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | ||
| NDR-S | 6.0 x 2.5 x 2.5 | ||
| NDR-M | 8.0 x 3.0 x 3.0 | ||
| NDR-L | 19.0 x 4.0 x 4.0 | ||
| NDC-T | Ø2.0 x 4.0 | ||
| NDC-S | Ø3.0 x 7.0 | ||
| NDC-M | Ø4.0 x 10.0 | ||
| NDC-L | Ø8.0 x 15.0 |
Actuation Distances for Vertical Mounting on PCBs
Operate Band 7-12 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 3.0 – 4.5 | 4.0 – 5.0 |
| NDR-S | 6.0 x 2.5 x 2.5 | 8.0 – 10.5 | 9.5 – 11.5 |
| NDR-M | 8.0 x 3.0 x 3.0 | 11.0 – 14.0 | 12.5 – 15.0 |
| NDR-L | 19.0 x 4.0 x 4.0 | 20.0 – 25.0 | 23.0 – 25.5 |
| NDC-T | Ø2.0 x 4.0 | 4.0 – 5.5 | 5.0 – 6.5 |
| NDC-S | Ø3.0 x 7.0 | 9.0 – 11.0 | 10.0 – 12.0 |
| NDC-M | Ø4.0 x 10.0 | 15.0 – 18.0 | 16.5 – 18.5 |
| NDC-L | Ø8.0 x 15.0 | 29.0 – 35.0 | 31.5 – 36.0 |
Operate Band 12-17 (AT)
| Magnet | Dimensions | Operate Distance | Release Distance |
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 3.5 | 3.0 – 4.5 |
| NDR-S | 6.0 x 2.5 x 2.5 | 7.0 – 8.0 | 9.0 – 9.5 |
| NDR-M | 8.0 x 3.0 x 3.0 | 9.5 – 11.5 | 10.5 – 13.0 |
| NDR-L | 19.0 x 4.0 x 4.0 | 17.0 – 20.0 | 19.0 – 23.0 |
| NDC-T | Ø2.0 x 4.0 | 3.0 – 4.0 | 3.5 – 5.5 |
| NDC-S | Ø3.0 x 7.0 | 8.0 – 9.0 | 9.0 – 10.5 |
| NDC-M | Ø4.0 x 10.0 | 12.5 – 15.0 | 14.5 – 16.5 |
| NDC-L | Ø8.0 x 15.0 | 25.0 – 29.0 | 27.5 – 31.5 |
