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. 811-0745
BrandRS PRO
TWD123.00
Each
units
Linear Actuator Rectangular - 32mm 13mm 8mm 32 x 13 x 8 mm
RS Stock No. 822-4689
Mfr. Part No.GLS-M1
BrandOmron
TWD665.00
Each
units
Proximity Sensor Rectangular - 50mm 10mm 14mm 50 x 10 x 14 mm
RS Stock No. 361-5009
Mfr. Part No.S1443
BrandAssemtech
TWD124.00
Each
units
Hall Effect Switch Rectangular - 30mm 7mm 20mm 30 x 7 x 20 mm
RS Stock No. 765-9334
Mfr. Part No.MP200702
BrandCherry
TWD471.00
Each
units
Magnetic Proximity Sensor Cylindrical - 25.4mm - - -
RS Stock No. 536-1748
BrandRS PRO
TWD86.00
Each
units
Transducer Rectangular - 28.6mm 19mm 6.3mm 28.6 x 6.3 x 19 mm
RS Stock No. 613-8202
Mfr. Part No.MMPSM
BrandAssemtech
TWD93.00
Each
units
Door Switch, Linear Actuator, Security System Switch Rectangular - 20mm 6mm 14mm 20 x 6 x 14 mm
RS Stock No. 837-2007
Mfr. Part No.BTL6-A-3801-2
BrandBALLUFF
TWD812.00
Each
units
Micropulse Transducer Rectangular - 37.6mm 21mm 18mm 37.6 x 21 x 18 mm
RS Stock No. 331-8168
Mfr. Part No.RSH01
BrandAssemtech
TWD44.00
Each
units
Filter, Reed Switch, Tachometer, Transducer Rectangular - 12.7mm 1.57mm 3.17mm 12.7 x 1.57 x 3.17 mm
RS Stock No. 784-0029
Mfr. Part No.DM25-32-07
TWD640.00
Each
units
Magnetic Sensor Round 32 mm - - 7mm 32 (Dia.) x 7 mm
RS Stock No. 331-8174
Mfr. Part No.RSH32
BrandAssemtech
TWD55.00
Each
units
Filter, Reed Switch, Tachometer, Transducer Rectangular - 27.94mm 4.75mm 4.75mm 27.94 x 4.75 x 4.75 mm
RS Stock No. 917-2646
Mfr. Part No.PCA22330
BrandCelduc
TWD412.00
Each
units
Magnetic Proximity Sensor Cylindrical M12 80mm - - -
RS Stock No. 765-9362
Mfr. Part No.CU103601
BrandZF
TWD1,820.00
Each
units
Angular Position Sensor - - 57.33mm 48.3mm 17.7mm 57.33 x 48.3 x 17.7 mm
RS Stock No. 466-1479
Mfr. Part No.T-62 N/S
TWD205.00
Each
units
Electronic Magnetic Sensor Cylindrical 23 mm 10mm - - 23 x 10 mm
RS Stock No. 361-4927
BrandRS PRO
TWD112.00
Each
units
Proximity Switch Rectangular - 32mm 8mm 15mm 32 x 8 x 15 mm
RS Stock No. 917-2671
Mfr. Part No.PTI40020
BrandCelduc
TWD349.00
Each
units
Magnetic Proximity Sensor Cylindrical M8 25mm - - -
RS Stock No. 179-2889
Mfr. Part No.P3150000
BrandCelduc
TWD251.00
Each
units
Proximity Sensor Rectangular - 32mm 6.8mm 15mm 32 x 6.8 x 15 mm
RS Stock No. 179-2895
Mfr. Part No.P6250000
BrandCelduc
TWD289.00
Each
units
Proximity Sensor Rectangular - 32mm 6.8mm 15mm 32 x 6.8 x 15 mm
RS Stock No. 181-2185
Mfr. Part No.101MG7
BrandHoneywell
TWD499.00
Each
units
Solid State Sensor Cylindrical 6 mm 6.3mm - - 6.3 x 6.3 mm
RS Stock No. 339-768
BrandRS PRO
TWD226.00
Each
units
Magnetic Proximity Switch Rectangular - 38mm 10mm 25mm 38 x 25 x 10 mm
RS Stock No. 536-1732
BrandRS PRO
TWD64.00
Each
units
Transducer Rectangular - 20mm - - -