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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Description Price Application Shape Diameter Length Width Height Dimensions
RS Stock No. 339-768
BrandRS PRO
$15.54
Each
units
Magnetic Proximity Switch Rectangular - 38mm 10mm 25mm 38 x 25 x 10 mm
RS Stock No. 361-4927
BrandRS PRO
$6.88
Each
units
Proximity Switch Rectangular - 32mm 8mm 15mm 32 x 8 x 15 mm
RS Stock No. 811-0745
BrandRS PRO
$6.71
Each
units
Linear Actuator Rectangular - 32mm 13mm 8mm 32 x 13 x 8 mm
RS Stock No. 536-1710
BrandRS PRO
$1.98
Each
units
Transducer Cylindrical 4 mm 19mm - - 4 x 19 mm
RS Stock No. 536-1748
BrandRS PRO
$5.31
Each
units
Transducer Rectangular - 28.6mm 19mm 6.3mm 28.6 x 6.3 x 19 mm
RS Stock No. 285-245
BrandRS PRO
$8.81
Each
units
Proximity Switch Rectangular - 32mm 24mm 10mm 32 x 24 x 10 mm
RS Stock No. 361-7011
BrandRS PRO
$8.79
Each
units
Proximity Switch Cylindrical 11 mm 28mm - - 11 x 28 mm
RS Stock No. 536-1732
BrandRS PRO
$2.56
Each
units
Transducer Rectangular - 20mm - - -
RS Stock No. 289-7812
Mfr. Part No.PSM BLK
BrandAssemtech
$8.99
Each
units
Proximity Switch Rectangular - 30mm 7mm 20mm 30 x 7 x 20 mm
RS Stock No. 361-5021
Mfr. Part No.S1467
BrandAssemtech
$23.76
Each
units
Hall Effect Switch Cylindrical - 45mm - - -
RS Stock No. 765-9337
Mfr. Part No.MP201801
BrandZF
$8.93
Each
units
Magnetic Proximity Sensor Rectangular - 23.01mm 13.97mm 5.99mm 23.01 x 13.97 x 5.99 mm
RS Stock No. 613-8202
Mfr. Part No.MMPSM
BrandAssemtech
$5.61
Each
units
Door Switch, Linear Actuator, Security System Switch Rectangular - 20mm 6mm 14mm 20 x 6 x 14 mm
RS Stock No. 361-5009
Mfr. Part No.S1443
BrandAssemtech
$8.48
Each
units
Hall Effect Switch Rectangular - 30mm 7mm 20mm 30 x 7 x 20 mm
RS Stock No. 765-9340
Mfr. Part No.AS201801
BrandZF
$7.10
Each
units
Magnetic Reed Sensor Rectangular - - - - -
RS Stock No. 917-2665
Mfr. Part No.PLMA0100
BrandCelduc
$60.68
Each
units
Magnetic Proximity Sensor Rectangular - 88mm 12mm 38mm 88 x 38 x 12 mm
RS Stock No. 331-7597
Mfr. Part No.S1417
BrandAssemtech
$63.24
Each
units
Reed Switch Cylindrical - 50mm - - -
RS Stock No. 765-9331
Mfr. Part No.MP201901
BrandZF
$8.27
Each
units
Magnetic Proximity Sensor Rectangular - 28.58mm 19.1mm 6.35mm 28.58 x 19.1 x 6.35 mm
RS Stock No. 355-5519
Mfr. Part No.BTL5-F-2814-1S
BrandBALLUFF
$76.23
Each
units
Micropulse Transducer Rectangular - 28mm 40mm 29.9mm 28 x 40 x 29.9 mm
RS Stock No. 917-2646
Mfr. Part No.PCA22330
BrandCelduc
$24.56
Each
units
Magnetic Proximity Sensor Cylindrical M12 80mm - - -
RS Stock No. 331-8174
Mfr. Part No.RSH32
BrandAssemtech
$2.34
Each
units
Filter, Reed Switch, Tachometer, Transducer Rectangular - 27.94mm 4.75mm 4.75mm 27.94 x 4.75 x 4.75 mm
Related Products
Celduc PTA/PDC series M10 magnetic proximity sensors are ...
Description:
Celduc PTA/PDC series M10 magnetic proximity sensors are an extremely small package size. Featuring a normally open contact in a stainless steel housing. The PTA/PDC series comes pre cabled with a 2 wire 2 m length cable.
Proximity sensors with longer sensing distance require increased ...
Description:
Proximity sensors with longer sensing distance require increased sensitivity. However, with the increased sensitivity, temperature changes will have bigger influence in sensing distance. E2E NEXT Proximity Sensors use "Thermal Distance Control": long-distance and stable detection technology, newly developed by ...
These magnets are designed to control Hall effect ...
Description:
These magnets are designed to control Hall effect sensors with on-off or analog operation.Easy to install with a 1/4-20 and 8-32 American thread nut (not supplied), for the model number.
Magnetic proximity sensor with Reed switch and M8 ...
Description:
Magnetic proximity sensor with Reed switch and M8 thermoplastic housing.2-metre output cable.Detection distance up to 19 mm.LED displays operating status.