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
×

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.

Reed Switch Lead Formation Tolerances

Reed Switch physical modifications Reed Switches may need to be mounted suitably on various different types of PCBs,...Continue reading ->

Magnet Usage

Magnet storage Rectangular Magnets The storage and usage temperature of magnets should be within the individual...Continue reading ->

Operating Characteristics of a Reed Switch

Magnetic characteristics of a reed switch The following examples show typical operating characteristics of a reed switch when actuated with...Continue reading ->

Magnet Information

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 ultra miniature cropped reed switch dimension
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
cropped reed switch actuation 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
cropped reed switch actuation 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 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
cropped reed switch actuation 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
cropped reed switch actuation 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-H ultra miniature SMD reed switch dimension
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
SMD formed reed switch actuation 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
SMD formed reed switch actuation 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 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
SMD formed reed switch actuation 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
SMD formed reed switch actuation 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-H ultra miniature vertical mount reed switch dimension
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
Welded reed switch actuation 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
Welded reed switch actuation 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 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
Welded reed switch actuation 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
Welded reed switch actuation 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