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
$14.13
Each
units
Magnetic Proximity Switch Rectangular - 38mm 10mm 25mm 38 x 25 x 10 mm
RS Stock No. 811-0745
BrandRS PRO
$5.93
Each
units
Linear Actuator Rectangular - 32mm 13mm 8mm 32 x 13 x 8 mm
RS Stock No. 361-7011
BrandRS PRO
$7.99
Each
units
Proximity Switch Cylindrical 11 mm 28mm - - 11 x 28 mm
RS Stock No. 536-1710
BrandRS PRO
$2.07
Each
units
Transducer Cylindrical 4 mm 19mm - - 4 x 19 mm
RS Stock No. 361-4927
BrandRS PRO
$6.25
Each
units
Proximity Switch Rectangular - 32mm 8mm 15mm 32 x 8 x 15 mm
RS Stock No. 536-1732
BrandRS PRO
$3.11
Each
units
Transducer Rectangular - 20mm - - -
RS Stock No. 285-245
BrandRS PRO
$9.53
Each
units
Proximity Switch Rectangular - 32mm 24mm 10mm 32 x 24 x 10 mm
RS Stock No. 536-1748
BrandRS PRO
$4.83
Each
units
Transducer Rectangular - 28.6mm 19mm 6.3mm 28.6 x 6.3 x 19 mm
RS Stock No. 289-7812
Mfr. Part No.PSM BLK
BrandAssemtech
$8.17
Each
units
Proximity Switch Rectangular - 30mm 7mm 20mm 30 x 7 x 20 mm
RS Stock No. 765-9331
Mfr. Part No.MP201901
BrandZF
$7.52
Each
units
Magnetic Proximity Sensor Rectangular - 28.58mm 19.1mm 6.35mm 28.58 x 19.1 x 6.35 mm
RS Stock No. 917-2640
Mfr. Part No.PCC26720
BrandCelduc
$27.36
Each
units
Magnetic Proximity Sensor Cylindrical M12 80mm - - -
RS Stock No. 917-2646
Mfr. Part No.PCA22330
BrandCelduc
$23.55
Each
units
Magnetic Proximity Sensor Cylindrical M12 80mm - - -
RS Stock No. 331-7597
Mfr. Part No.S1417
BrandAssemtech
$57.49
Each
units
Reed Switch Cylindrical - 50mm - - -
RS Stock No. 613-8202
Mfr. Part No.MMPSM
BrandAssemtech
$5.10
Each
units
Door Switch, Linear Actuator, Security System Switch Rectangular - 20mm 6mm 14mm 20 x 6 x 14 mm
RS Stock No. 917-2678
Mfr. Part No.PTI70020
BrandCelduc
$47.32
Each
units
Magnetic Proximity Sensor Cylindrical M8 32mm - - -
RS Stock No. 466-1479
Mfr. Part No.T-62 N/S
$12.02
Each
units
Electronic Magnetic Sensor Cylindrical 23 mm 10mm - - 23 x 10 mm
RS Stock No. 361-5021
Mfr. Part No.S1467
BrandAssemtech
$28.40
Each
units
Hall Effect Switch Cylindrical - 45mm - - -
RS Stock No. 917-2671
Mfr. Part No.PTI40020
BrandCelduc
$21.80
Each
units
Magnetic Proximity Sensor Cylindrical M8 25mm - - -
RS Stock No. 917-2662
Mfr. Part No.PTA80020
BrandCelduc
$33.01
Each
units
Magnetic Proximity Sensor Cylindrical M10 40mm - - -
RS Stock No. 765-9340
Mfr. Part No.AS201801
BrandZF
$6.46
Each
units
Magnetic Reed Sensor Rectangular - - - - -
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These analogue output style transducers are available in ...
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These analogue output style transducers are available in three sizes: 1/4in (std), 3/8in (high o/p) and 5/8in (heavy duty). They offer an inexpensive solution wherever a simple alternating waveform corresponding to movement past the pole piece is required. They are ...
An ideal method to mount sensors onto conveyors ...
Description:
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The MP2018 series of sensors from Cherry are ...
Description:
The MP2018 series of sensors from Cherry are reed based magnetic position sensors in a mini plastic flange mount package These switches can be approached by a magnet from any angle and with either pole. SPST-NO Form A10 W max. ...