Actuation Distances for UM-0018-H Reed Switches
Operate and release distances for the UM-0018-H 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 UM-0018-H Cropped Reed Switch
UM-0018-H cropped reed switch dimension
All dimensions are in mm
UM-0018-H (7-12 AT)
| Actuation Sketch | 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 | Φ2.0 x 4.0 | 3.5 – 5.5 | 4.0 – 6.0 | |
| NDC-S | Φ3.0 x 7.0 | 8.0 – 10.0 | 9.0 – 11.0 | |
| NDC-M | Φ4.0 x 10 | 12.0 – 15.5 | 13.0 – 16.0 | |
| NDC-L | Φ8.0 x 15.0 | 23.0 – 30.0 | 25.0 – 30.5 |
UM-0018-H (12-17 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Di stance |
|---|---|---|---|---|
|
||||
| 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 | Φ2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 4.0 | |
| NDC-S | Φ3.0 x 7.0 | 6.5 – 8.0 | 7.0 – 9.0 | |
| NDC-M | Φ4.0 x 10 | 10.5 – 12.0 | 12.0 – 13.0 | |
| NDC-L | Φ8.0 x 15.0 | 20.0 – 23.0 | 22.0 – 25.0 |
UM-0018-H (10-15 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 2.0 – 3.5 | 3.0 – 4.0 | |
| NDR-S | 6.0 x 2.5 x 2.5 | 6.5 – 8.0 | 7.0 – 9.0 | |
| NDR-M | 8.0 x 3.0 x 3.0 | 8.5 – 10.5 | 10.0 – 11.5 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 15.0 – 17.5 | 16.5 – 20.0 | |
| NDC-T | Φ2.0 x 4.0 | 3.0 – 5.0 | 3.5 – 5.5 | |
| NDC-S | Φ3.0 x 7.0 | 7.0 – 9.0 | 8.0 – 10.0 | |
| NDC-M | Φ4.0 x 10 | 11.0 – 13.0 | 12.0 – 14.0 | |
| NDC-L | Φ8.0 x 15.0 | 22.5 – 25.0 | 24.0 – 27.0 |
UM-0018-H (15-20 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 1.5 – 3.0 | 2.0 – 3.5 | |
| 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 | 7.5 – 8.5 | 8.0 – 10.0 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 13.5 – 15.0 | 14.5 – 16.5 | |
| NDC-T | Φ2.0 x 4.0 | 2.5 – 3.5 | 3.0 – 4.0 | |
| NDC-S | Φ3.0 x 7.0 | 6.0 – 7.0 | 7.0 – 8.0 | |
| NDC-M | Φ4.0 x 10 | 9.5 – 11.0 | 11.0 – 12.5 | |
| NDC-L | Φ8.0 x 15.0 | 20.0 – 22.5 | 22.0 – 24.0 |
Activation Distances for UM-0018-H SMD Reed Switch
UM-0018-M SMD reed switch dimension
All dimensions are in mm
UM-0018-H (7-12 AT)
| Actuation Sketch | 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 – 14.0 | |
| NDC-T | Φ2.0 x 4.0 | 3.5 – 6.0 | 4.0 – 6.5 | |
| NDC-S | Φ3.0 x 7.0 | 8.5 – 11.0 | 9.0 – 12.0 | |
| NDC-M | Φ4.0 x 10 | 13.0 – 17.0 | 13.5 – 18.0 | |
| NDC-L | Φ8.0 x 15.0 | 26.0 – 34.0 | 27.0 – 35.0 |
UM-0018-H (12-17 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Di stance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 3.0 | 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 | Φ2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 4.0 | |
| NDC-S | Φ3.0 x 7.0 | 7.0 – 8.5 | 8.0 – 9.0 | |
| NDC-M | Φ4.0 x 10 | 11.0 – 13.0 | 12.5 – 13.5 | |
| NDC-L | Φ8.0 x 15.0 | 22.0 – 26.0 | 25.0 – 27.0 |
UM-0018-H (10-15 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 3.5 | 3.0 – 4.0 | |
| NDR-S | 6.0 x 2.5 x 2.5 | 7.0 – 8.0 | 7.5 – 9.0 | |
| NDR-M | 8.0 x 3.0 x 3.0 | 9.0 – 11.0 | 10.0 – 12.0 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 15.5 – 19.0 | 17.5 – 20.5 | |
| NDC-T | Φ2.0 x 4.0 | 3.0 – 4.5 | 3.5 – 5.0 | |
| NDC-S | Φ3.0 x 7.0 | 7.5 – 9.0 | 8.5 – 10.0 | |
| NDC-M | Φ4.0 x 10 | 11.5 – 14.5 | 13.0 – 15.5 | |
| NDC-L | Φ8.0 x 15.0 | 22.5 – 28.5 | 26.0 – 30.0 |
UM-0018-H (15-20 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 2.5 – 3.0 | 3.0 – 3.5 | |
| NDR-S | 6.0 x 2.5 x 2.5 | 5.5 – 7.0 | 6.0 – 7.5 | |
| NDR-M | 8.0 x 3.0 x 3.0 | 8.5 – 9.5 | 9.5 – 10.5 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 14.0 – 15.5 | 16.0 – 17.5 | |
| NDC-T | Φ2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 4.0 | |
| NDC-S | Φ3.0 x 7.0 | 6.5 – 7.5 | 7.5 – 8.5 | |
| NDC-M | Φ4.0 x 10 | 11.0 – 11.5 | 12.0 – 13.0 | |
| NDC-L | Φ8.0 x 15.0 | 21.0 – 22.5 | 23.5 – 26.0 |
Activation Distances for UM-0018-H Vertical Mount Reed Switch
UM-0018-M vertical mount reed switch dimension
All dimensions are in mm
UM-0018-H (7-12 AT)
| Actuation Sketch | 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 | Φ2.0 x 4.0 | 4.0 – 5.5 | 5.0 – 6.5 | |
| NDC-S | Φ3.0 x 7.0 | 9.0 – 11.0 | 10.0 – 12.0 | |
| NDC-M | Φ4.0 x 10 | 15.0 – 18.0 | 16.5 – 18.5 | |
| NDC-L | Φ8.0 x 15.0 | 29.0 – 35.0 | 31.5 – 36.0 |
UM-0018-H (12-17 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Di stance |
|---|---|---|---|---|
|
||||
| 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 | Φ2.0 x 4.0 | 3.0 – 4.0 | 3.5 – 5.5 | |
| NDC-S | Φ3.0 x 7.0 | 8.0 – 9.0 | 9.0 – 10.5 | |
| NDC-M | Φ4.0 x 10 | 12.5 – 15.0 | 14.5 – 16.5 | |
| NDC-L | Φ8.0 x 15.0 | 25.0 – 29.0 | 27.5 – 31.5 |
UM-0018-H (10-15 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 3.0 – 4.0 | 4.0 – 5.0 | |
| NDR-S | 6.0 x 2.5 x 2.5 | 7.0 – 9.5 | 9.0 – 11.0 | |
| NDR-M | 8.0 x 3.0 x 3.0 | 10.0 – 13.0 | 12.5 – 14.5 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 17.0 – 22.0 | 21.0 – 24.5 | |
| NDC-T | Φ2.0 x 4.0 | 3.5 – 5.0 | 5.0 – 6.0 | |
| NDC-S | Φ3.0 x 7.0 | 8.5 – 10.0 | 10.0 – 11.5 | |
| NDC-M | Φ4.0 x 10 | 13.0 – 16.5 | 16.0 – 18.0 | |
| NDC-L | Φ8.0 x 15.0 | 26.0 – 31.5 | 30.0 – 35.0 |
UM-0018-H (15-20 AT)
| Actuation Sketch | Magnet | Dimensions | Operate Distance | Release Distance |
|---|---|---|---|---|
|
||||
| NDR-T | 4.0 x 1.5 x 1.5 | 2.0 – 3.0 | 3.0 – 4.0 | |
| NDR-S | 6.0 x 2.5 x 2.5 | 6.5 – 7.5 | 8.0 – 9.0 | |
| NDR-M | 8.0 x 3.0 x 3.0 | 9.0 – 10.0 | 10.5 – 13.0 | |
| NDR-L | 19.0 x 4.0 x 4.0 | 16.0 – 18.0 | 19.0 – 21.0 | |
| NDC-T | Φ2.0 x 4.0 | 3.0 – 3.5 | 3.5 – 5.0 | |
| NDC-S | Φ3.0 x 7.0 | 7.0 – 8.5 | 9.0 – 10.0 | |
| NDC-M | Φ4.0 x 10 | 12.0 – 13.0 | 14.0 – 16.0 | |
| NDC-L | Φ8.0 x 15.0 | 24.0 – 26.0 | 27.0 – 30.0 |