Sensor & Switch Magnets

Sensor magnets (also known as reed switches) are electrical switches operated by a magnetic field. They can be used to detect specific actions, like the opening of a door, and are widely used for electrical circuit control.

What are sensor magnets used for?

Sensor magnets can be used in door and window sensors, and are commonly found in burglar alarm systems. They're also widely used for communications. Once the magnet is pulled away from the switch, the reed switch will go back to its original position. A reed relay is when there are one or more reed switches inside a coil.

Why use sensor magnets?

Sensor magnets can be used to reduce current leakage. This is useful for applications in hazardous areas, for example where there's flammable gas in the area, or in medical devices. Sensor magnets are also useful in locations where it isn't possible to make direct contact with the switch, such as in explosive or toxic environments.


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Viewing 21 - 40 of 57 products
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Description Price Application Shape Diameter Length Width Height Dimensions
RS Stock No. 917-2668
Mfr. Part No.PLC10040
BrandCelduc
£11.49
Each
Units
Magnetic Proximity Sensor Rectangular - 32mm 6.8mm 15mm 32 x 15 x 6.8 mm
RS Stock No. 289-7856
Mfr. Part No.PRM
BrandAssemtech
£1.00
Each
Units
Reed Switch Cylindrical 6 mm 18mm - - 6 x 18 mm
RS Stock No. 917-2662
Mfr. Part No.PTA80020
BrandCelduc
£13.26
Each
Units
Magnetic Proximity Sensor Cylindrical M10 40mm - - -
RS Stock No. 837-2007
Mfr. Part No.BTL6-A-3801-2
BrandBALLUFF
£17.86
Each
Units
Micropulse Transducer Rectangular - 37.6mm 21mm 18mm 37.6 x 21 x 18 mm
RS Stock No. 917-2671
Mfr. Part No.PTI40020
BrandCelduc
£7.94
Each
Units
Magnetic Proximity Sensor Cylindrical M8 25mm - - -
RS Stock No. 124-3807
BrandBALLUFF
£29.87
Each
Units
Micropulse Transducer Rectangular - 55mm 20mm 21mm 55 x 20 x 21 mm
RS Stock No. 765-9334
Mfr. Part No.MP200702
BrandCherry
£6.76
Each
Units
Magnetic Proximity Sensor Cylindrical - 25.4mm - - -
RS Stock No. 361-5009
Mfr. Part No.S1443
BrandAssemtech
£2.71
Each
Units
Hall Effect Switch Rectangular - 30mm 7mm 20mm 30 x 7 x 20 mm
RS Stock No. 837-2003
Mfr. Part No.BTL6-A-3800-2
BrandBALLUFF
£17.86
Each
Units
Micropulse Transducer Rectangular - 37.6mm 21mm 28.8mm 37.6 x 21 x 28.8 mm
RS Stock No. 331-8613
Mfr. Part No.RSH33
BrandAssemtech
£0.75
Each
Units
Filter, Reed Switch, Tachometer, Transducer Rectangular - 19.05mm 3mm 3mm 19.05 x 3 x 3 mm
RS Stock No. 791-8557
Mfr. Part No.MWR0032KAC-KH
BrandSensitec
£3.42
Each
Units
MagnetoResistive sensor Round 20 mm - 3.5mm - 20.44 x 3.5 mm
RS Stock No. 917-2678
Mfr. Part No.PTI70020
BrandCelduc
£19.15
Each
Units
Magnetic Proximity Sensor Cylindrical M8 32mm - - -
RS Stock No. 179-2895
Mfr. Part No.P6250000
BrandCelduc
£6.28
Each
Units
Proximity Sensor Rectangular - 32mm 6.8mm 15mm 32 x 6.8 x 15 mm
RS Stock No. 917-2674
Mfr. Part No.PTI50020
BrandCelduc
£11.52
Each
Units
Magnetic Proximity Sensor Cylindrical M8 25mm - - -
RS Stock No. 765-9347
Mfr. Part No.MP200701
BrandZF
£7.51
Each
Units
Magnetic Proximity Sensor Cylindrical - 25.4mm - - -
RS Stock No. 361-5021
Mfr. Part No.S1467
BrandAssemtech
£13.72
Each
Units
Hall Effect Switch Cylindrical - 45mm - - -
RS Stock No. 466-1479
Mfr. Part No.T-62 N/S
£4.78
Each
Units
Electronic Magnetic Sensor Cylindrical 23 mm 10mm - - 23 x 10 mm
RS Stock No. 290-0621
Mfr. Part No.MAG-3015-B
BrandSick
£9.12
Each
Units
Magnetic Proximity Sensor Cylindrical 31 mm 15mm - - 31 x 15 mm
RS Stock No. 765-9340
Mfr. Part No.AS201801
BrandZF
£2.48
Each
Units
Magnetic Reed Sensor Rectangular - - - - -
RS Stock No. 331-8168
Mfr. Part No.RSH01
BrandAssemtech
£1.00
Each
Units
Filter, Reed Switch, Tachometer, Transducer Rectangular - 12.7mm 1.57mm 3.17mm 12.7 x 1.57 x 3.17 mm
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