Actuation Distances for UM-0018-M Reed Switches

Actuation distances for UM-0018-M 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-M Cropped Reed Switch

UM-0018-M cropped reed switch dimension
All dimensions are in mm

UM-0018-M (7-12 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	2.3 – 3.5	2.5 – 4.0
	NDR-S	6.0 x 2.5 x 2.5	6.0 – 7.5	6.5 – 7.0
	NDR-M	8.0 x 3.0 x 3.0	8.0 – 9.5	8.5 – 10.0
	NDR-L	19.0 x 4.0 x 4.0	13.3  – 17.5	14.0 – 18.0
	NDC-T	Φ2.0 x 4.0	3.2 – 4.2	3.7 – 5.2
	NDC-S	Φ3.0 x 7.0	7.0 – 8.0	7.5 – 8.5
	NDC-M	Φ4.0 x 10	10.5 – 12.0	11.5 – 13.5
	NDC-L	Φ8.0 x 15.0	20.5 – 24.0	21.5 – 25.0

UM-0018-M (12-17 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Di stance
	NDR-T	4.0 x 1.5 x 1.5	2.0 – 2.3	2.3 – 3.5
	NDR-S	6.0 x 2.5 x 2.5	5.0 – 6.0	5.5 – 7.0
	NDR-M	8.0 x 3.0 x 3.0	7.5 – 8.0	8.0 – 8.5
	NDR-L	19.0 x 4.0 x 4.0	13.0 – 13.5	13.5 – 14.0
	NDC-T	Φ2.0 x 4.0	3.0 – 3.3	3.2 – 4.0
	NDC-S	Φ3.0 x 7.0	6.5 – 7.0	7.0 – 8.0
	NDC-M	Φ4.0 x 10	10.0 – 10.5	10.5 – 11.5
	NDC-L	Φ8.0 x 15.0	20.0 – 20.5	21.0 – 22.0

UM-0018-M (10-15 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	2.0 – 2.5	2.5 – 3.0
	NDR-S	6.0 x 2.5 x 2.5	5.5 – 6.5	6.0 – 7.0
	NDR-M	8.0 x 3.0 x 3.0	7.5 – 9.0	8.0 – 10.0
	NDR-L	19.0 x 4.0 x 4.0	13.0 – 14.0	14.0 – 15.5
	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	7.0 – 8.0
	NDC-M	Φ4.0 x 10	10.0 – 11.0	10.5 – 12.0
	NDC-L	Φ8.0 x 15.0	20.0 – 21.0	20.8 – 22.0

UM-0018-M (15-20 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	2.0 – 2.2	2.2 – 2.5
	NDR-S	6.0 x 2.5 x 2.5	5.0 – 5.5	5.3 – 6.0
	NDR-M	8.0 x 3.0 x 3.0	7.5 – 8.0	8.0 – 8.5
	NDR-L	19.0 x 4.0 x 4.0	12.0 – 13.5	12.5 – 14.5
	NDC-T	Φ2.0 x 4.0	3.0 – 3.3	3.2 – 3.7
	NDC-S	Φ3.0 x 7.0	6.0 – 7.0	6.5 – 7.5
	NDC-M	Φ4.0 x 10	10.0 – 10.5	10.5 – 11.0
	NDC-L	Φ8.0 x 15.0	18.5 – 20.5	19.5 – 21.0

 

Activation Distances for UM-0018-M SMD Reed Switch

UM-0018-M SMD reed switch dimension
All dimensions are in mm

UM-0018-M (7-12 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	3.0 – 3.5	3.5 – 4.0
	NDR-S	6.0 x 2.5 x 2.5	7.0 – 7.5	7.5 – 8.0
	NDR-M	8.0 x 3.0 x 3.0	8.5 – 10.0	9.0 – 11.0
	NDR-L	19.0 x 4.0 x 4.0	14.0 – 17.0	15.0 – 18.0
	NDC-M	Φ4.0 x 10	10.5 – 13.0	11.0 – 14.0
	NDC-T	Φ2.0 x 4.0	3.5 – 4.5	4.0 – 5.0
	NDC-S	Φ3.0 x 7.0	7.0 – 8.5	7.5 – 9.0
	NDC-L	Φ8.0 x 15.0	21.0 – 25.0	22.0 – 26.5

UM-0018-M (12-17 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	2.5 – 3.0	2.0 – 3.5
	NDR-S	6.0 x 2.5 x 2.5	6.0 – 7.0	6.5 – 7.5
	NDR-M	8.0 x 3.0 x 3.0	8.0 – 8.5	8.5 – 9.0
	NDR-L	19.0 x 4.0 x 4.0	13.0 – 14.0	14.0 – 15.5
	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	7.0 – 8.0
	NDC-M	Φ4.0 x 10	10.0 – 10.5	10.5 – 11.5
	NDC-L	Φ8.0 x 15.0	20.0 – 21.0	21.0 – 23.0

UM-0018-M (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	6.0 – 7.5	6.5 – 8.0
	NDR-M	8.0 x 3.0 x 3.0	8.0 – 9.0	8.5 – 9.5
	NDR-L	19.0 x 4.0 x 4.0	13.0 – 15.0	14.0 – 16.5
	NDC-T	Φ2.0 x 4.0	3.5 – 4.0	3.5 – 4.5
	NDC-S	Φ3.0 x 7.0	7.0 – 7.5	7.5 – 8.0
	NDC-M	Φ4.0 x 10	10.0 – 11.0	10.5 – 12.0
	NDC-L	Φ8.0 x 15.0	20. 0 – 22.0	21.0 – 23.0

UM-0018-M (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 – 6.5	6.0 – 7.0
	NDR-M	8.0 x 3.0 x 3.0	8.0 – 8.5	8.5 – 9.0
	NDR-L	19.0 x 4.0 x 4.0	13.0 – 13.5	14.0 – 15.0
	NDC-T	Φ2.0 x 4.0	3.0 – 3.5	3.5 – 4.0
	NDC-S	Φ3.0 x 7.0	6.5 – 7.0	7.0 – 7.5
	NDC-M	Φ4.0 x 10	10.0 – 10.5	10.5 – 11.0
	NDC-L	Φ8.0 x 15.0	20.0 – 20.5	21.0 – 23.0

 

Activation Distances for UM-0018-M Verical Mount Reed Switch

UM-0018-M horizontal mount reed switch dimension
All dimensions are in mm

UM-0018-M (7-12 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	3.0 – 3.5	3.5 – 4.0
	NDR-S	6.0 x 2.5 x 2.5	7.0 – 9.5	7.5 – 10.0
	NDR-M	8.0 x 3.0 x 3.0	10.0 – 11.5	10.5 – 12.5
	NDR-L	19.0 x 4.0 x 4.0	17.0 – 20.5	18.0 – 22.0
	NDC-T	Φ2.0 x 4.0	4.0 – 5.0	4.5 – 6.0
	NDC-S	Φ3.0 x 7.0	8.0 – 9.5	8.5 – 10.0
	NDC-M	Φ4.0 x 10	12.5 – 15.0	13.0 – 15.5
	NDC-L	Φ8.0 x 15.0	24.5 – 30.0	25.0 – 31.0

UM-0018-M (12-17 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	6.0 – 7.5	6.5 – 8.0
	NDR-M	8.0 x 3.0 x 3.0	9.5 – 10.5	10.0 – 11.5
	NDR-L	19.0 x 4.0 x 4.0	15.0 – 18.0	16.0 – 19.0
	NDC-T	Φ2.0 x 4.0	3.5 – 4.0	4.0 – 5.0
	NDC-S	Φ3.0 x 7.0	7.5 – 8.5	8.0 – 9.5
	NDC-M	Φ4.0 x 10	12.0 – 13.0	12.5 – 14.0
	NDC-L	Φ8.0 x 15.0	23.0 – 25.0	24.0 – 26.5

UM-0018-M (10-15 AT)

Actuation Sketch	Magnet	Dimensions	Operate Distance	Release Distance
	NDR-T	4.0 x 1.5 x 1.5	3.0 – 3.5	3.5 – 4.0
	NDR-S	6.0 x 2.5 x 2.5	6.0 – 7.5	6.5 – 8.5
	NDR-M	8.0 x 3.0 x 3.0	9.5 – 10.5	10.0 – 11.5
	NDR-L	19.0 x 4.0 x 4.0	15.0 – 17.5	15.5 – 18.0
	NDC-T	Φ2.0 x 4.0	3.5 – 4.5	4.0 – 5.0
	NDC-S	Φ3.0 x 7.0	7.5 – 8.5	8.0 – 9.0
	NDC-M	Φ4.0 x 10	12.0 – 13.0	12.5 – 14.0
	NDC-L	Φ8.0 x 15.0	23.0 – 25.0	24.0 – 26.5

UM-0018-M (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 – 7.5	6.0 – 8.0
	NDR-M	8.0 x 3.0 x 3.0	8.0 – 10.5	8.5 – 11.0
	NDR-L	19.0 x 4.0 x 4.0	14.0 – 18.0	14.5 – 19.0
	NDC-T	Φ2.0 x 4.0	3.0 – 4.0	3.5 – 4.5
	NDC-S	Φ3.0 x 7.0	7.0 – 8.5	7.5 – 9.0
	NDC-M	Φ4.0 x 10	10.5 – 13.0	11.0 – 14.0
	NDC-L	Φ8.0 x 15.0	21.0 – 25.5	22.0 – 26.0