Actuation Distances for UM-0018-H Reed Switches
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 will produce similar actuating distances, selecting the right AT band and magnet for an application is important. The following links will help understand AT Bands, Magnet types, and Magnet Selection better. All distances given are in mm and standard tolerances of ±0.5 mm apply.
Lead Formation Tolerances
 | Reed Switches may need to be mounted suitably on various different types of PCBs,...Continue reading |
Magnet Usage
 | Rectangular Magnets The storage and usage temperature of magnets should be within the individual...Continue reading |
Operating Characteristics of a Reed Switch
 | The following examples show typical operating characteristics of a reed switch when actuated with...Continue reading |
Magnet Information
 | In general, there are four families of magnets available commercially. Factors such as operating...Continue reading |
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 |