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-104 Ultra Miniature PCB Mountable Reed Sensor

  • MS-104 PCB Mountable Reed Sensor
  • MS-104 Reed Sensor Pad Layout Drawing


5W Contact Rating. 10.1 mm PCB Pitch. Normally Open contact. Two sensitivity bands. Two Lead Formations.



Omni-polar. Does not require power for operation. Sputtered Ruthenium Contact. RoHS Compliant. Not ESD Sensitive.


This ultra miniature PCB mountable reed sensor is designed for switching 10W.  The internal blades always parallel to the top surface of the sensor. The sensors are tested 100% for operate and release AT, Contact Resistance and Variable Contact Resistance before packing. Being an omnipolar 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-104 Reed Sensors

RRE MS-104 magnet actuation Operate and release distances for the MS-104 reed sensor in the three standard AT...Continue reading ->


Contact FormA
Contact Rating (max)W/VA5.0
Switching Current (max)A0.5
Carry Current (max)A0.5
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)ms0.10
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-104-(Operate Band Code)

Operate Band Code

Example: MS-104-1 denotes MS-104 Reed Sensor in 7-12 Operate Band (AT).

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

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 ->

Product Handling

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

Reflow Soldering

Drawing of SMD reflow soldering curve Reflow Soldering is the process of automatically soldering multiple devices to a PCB. Continue...Continue reading ->

Manual Soldering

Soldered Reed switch Manual Soldering of reed switch leads may be required when using custom plastic housing...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 ->

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-104 Reed Sensor is known to perform well.

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 in Model Train Tracks

Reed switches in signal moduling in model train track Reed Switches are placed under train tracks near a junction and each train is...Continue reading ->

Reed switches in LEGO Sensors

Reed switches in LEGO sensor Reed Switches can be built into LEGO bricks to sense position and rotation. Position...Continue reading ->

Reed switches in Washing machine vibration detection

Reed switches in washing machine Reed Switches are used for building bi-directional vibration sensors. These sensors can detect if...Continue reading ->

Reed sensors in Electric Toothbrushes

Reed switches in electric toothbrush Electric toothbrushes use Reed Sensors to sense change in direction when switching from the...Continue reading ->

Reed switches in Domestic Coffee Machines

Reed switches in Domestic coffee machine Domestic coffee machines use a solenoid to fill up the water reservoir whenever needed....Continue reading ->

Reed switches and Reed sensors in Wireless Microphones

Reed switches in on/off switches in microphones In wireless microphones and radio transmitters, unnecessary speaker crackle can be avoided at the...Continue reading ->
MS-104 Ultra Miniature PCB Mountable Reed Sensor
Ultra Miniature PCB Mountable reed Sensors: 10W, omnipolar, complete data sheet and technical specifications.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: MS-104
3.5 based on 2 reviews