Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

MS-212 Ultra-miniature Cylindrical Sensor



10W Contact Rating. Normally Open contact. Two sensitivity bands. Sputtered Ruthenium Contact.



Omni-polar. Does not require power for operation. RoHS Compliant. Not ESD Sensitive. Various Cables and Connectors Available.


These ultra-miniature cylindrical magnet sensors are suitable for low level switching applications, and have a size advantage over the other cylindrical sensors. Various activating distances are available depending on the magnet and the AT band used. This sensor can be supplied with non-standard connectors on request. All sensors are tested 100% for operate and release AT, Contact Resistance and Variable Contact Resistance before packing. Cylindrical sensors can be used in pneumatic cylinder end position sensing applications. Being an omni-polar device, this sensor can be actuated with either a north pole or a south pole or both. Choosing the right AT band, magnet strength, and operating axis, will restrict the number of operates and releases to one.

Cylindrical and Rectangular Magnets

Standard magnets-RRE We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading ->

Actuation Distances for MS-212 Cylindrical Sensor

MS-212 actuation-magnet parallel to sensor Operate and release distances for the MS-212 ultra-miniature cylindrical sensor in the two standard...Continue reading ->


Contact FormA
Contact Rating (max)W/VA10.0
Switching Current (max)A0.5
Carry Current (max)A0.50
DC Switching Voltage (max)VDC100
Breakdown Voltage (min)VDC150
Contact Resistance (max)200
Insulation Resistance (min)Ω109
Capacitance (typ)pF0.2


Operate Time (max)ms0.35
Bounce Time (max)ms0.30
Release Time (max)ms0.15
Resonance Frequency (typ)Hz>2000
Operating Frequency (max)Hz500
Operating Temperature Range°C-40 to +140
Shock Resistance (½Sin wave for 11ms)G30
Vibration Resistance (10-2000 Hz)G20

Ordering Code

MS-212-(Operate Band Code)-(Cable Length in mm)-(Cable Termination Code)

Operate Band Code
Cable Termination CodeTermination Type
SStripped to 5.0 mm
TStripped and Tinned

Example: MS-212-1-500-T denotes MS-212 Magnet Sensor in 10-15 Operate Band (AT), with 500 mm cable length and Tinned Cable ends.

Other Special Configurations: Lower Static Contact Resistance, Dynamic Contact Resistance Limit, Special Release Limits.

Usage Notes

Here are some of the recommended usage notes to ensure maximum durability of this product. The complete usage notes are available here.

Ampere Turn Selection

Reed Sensor Manufacturer Cross Reference For any application, it is important to select the correct Ampere Turn (AT) or...Continue reading ->

Effects of Temperature

Thermal sensor Effects of increase and decrease in temperature on reed based products and magnets. Continue...Continue reading ->

Product Handling

Dropping Reed switch Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading ->

Ferro-magnetic parts

Ferromagnetic parts Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading ->

Cable Handling

Twisting cables nearer to housing Cables with higher strands should be used so that there is minimal work hardening...Continue reading ->

Reed Contact Protection Circuits

Inductive Load Protection Circuit When a reed switch is to be connected to an inductive load or a...Continue reading ->


Although we can never restrict the use of a reed sensor to a particular field, the following is a list of some of the applications that the MS-212 Magnet Sensor is known to perform well.

Reed sensors for detecting Ignition Key

key ignition As long as the ignition key detecting reed sensor is not actuated means that...Continue reading ->

Reed Sensors in Pediatric Feeding tubes

Pediatric feeding tube To know the location of the end of a feeding tube, tiny reed switches...Continue reading ->

Reed Sensors in Hotel Security Card Readers

hotel card reader In most hotels, the simplest method for a guest to enter a room is...Continue reading ->

Reed sensors in Automobile Sun Visors

Automobile Sun Visor A reed sensor and a magnet is used in the sliding mirror assembly to...Continue reading ->

Reed switches in Lightsabers

Reed Switches are used in Lightsabers to for power up only when the owner...Continue reading ->

Reed sensors to control Automobile Sun-roofs

automotive sunroof An automotive sun-roof, usually made of tinted glass, is a movable panel that can...Continue reading ->

Magnet sensors in Musical Greeting Cards

Reed switches in musical greeting card Ultra miniature reed switches can be used in electronic greeting cards with magnets to...Continue reading ->

Reed sensors in Radio-controlled Gliders and model Airplanes

Reed switches in model airplanes Reed Sensors are very light devices and can be used in model airplanes, helicopters...Continue reading ->

Reed switches and Reed sensors in Lap counter in slot car racing tracks

Reed switches in lap counter in slot car racing Slot car racing tracks usually count the number of laps by having a small...Continue reading ->

Reed switches and Reed sensors in Spirometers

Spirometer Reed Switches help measure the volume of air intake and the time in a...Continue reading ->

Miniature Reed sensors in activating Dentist’s Drill

Dentist Drill A reed sensor finds the perfect application in such a drill, to work as...Continue reading ->
MS-212 Ultra-miniature Magnet Sensor
MS-212 Ultra-miniature Cylindrical Sensor: 2.6 mm diameter, 10W, omnipolar, suitable for low level switching, complete data sheet and technical specifications.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: MS-212
4.2 based on 6 reviews