The ersistor can be replaced with a capacitor also for enabling a similar kind of protection, as shown in figure B. Please view our large selection of reed relays below. This can easily be achieved either by biasing the device with a complementing nearby magnet as demonstrated below, or by using a 3 terminal SPDT type of reed switch as indicated in the second diagram below. Previous: Elementary Electronics Explained, Next: LM4862 Amplifier Circuit – A Better LM386 Alternative. Legacy Printed Circuit Board & Reed Relays. In this post we comprehensively learn about reed switch functioning, and how to make simple reed switch circuits. i'm working with same", "@DakLak: I have used peristaltic pumps in some applications, but I am new to screw conveyors. Free delivery and returns on eBay Plus items for Plus members. A REED relay consists of one or more switches positioned in the centre of a coil winding (solenoid). Reed relays and reed switches are used in many areas where smaller, faster acting relays are needed in an electronic or electrical circuit. A great advantage of the reed switch is its capacity to work very efficiently while switching low magnitudes of currents and voltages. Order Coto Technology DSS41A05 (420-1021-ND) at DigiKey. The contacts are concealed inside a glass tube and its ends terminated out of the glass tube for external connection. Float Switch: Reed switches can be used for effective corrosion free float switches water level controllers. Similarly, for a reed switch, the deactivation of its reeds may require the magnet to be moved much farther away from the point at which it was initially activated. Reed relay diagram Reed relays are deceptively simple devices in principle. Fundamentally, a reed switch is a magneto-mechanical relay. Reed switch also called reed relay, is a low current magnetic switch with a concealed pair of contacts that close and open in response to magnetic field near it. Your email address will not be published. But, there may be certain applications in which the reed may be required to be 'normally-closed' or switched ON, and switch OFF in the presence of a magnetic field. The 80s classic action series Knight Rider is being made into a feature film. The HE721C1210 is a Standard Miniature Reed Relay with transfer moulded external shield body, SPDT-CO contact, coil suppression diode and through hole terminals. To clean the syrup when it comes off the trees. This is a short hand way of describing contact configuration. The assembly can be protected by a surrounding magnetic shield, or it can be moulded. 99 Photodiode, Phototransistor – Working and Application Circuits, How to Make a Zero Crossing Detector Circuit, Learning Basic Arduino Programming – Tutorial for the Newcomers, Small Signal Transistor(BJT) and Diode Quick Datasheet, Temperature range = -55 degrees C to +150 degrees C, Life at zero load = 500 x 10^6 operations. In figure C we can see a diode connected across the reed. We use cookies to ensure that we give you the best experience on our website. Although this may slightly increase the idle current flow in the reed but that won't harm the reed anyway. Order Now! In the test each of the reeds could complete 50 million closures consistently with not a single occasion showing a switched resistance beyond 5 ohms. Its immense application advantages continued to be unnoticed by the electronic engineers, until the recent times when reed switches are becoming a part of many crucial electronic and electrical implementations. The contacts are concealed inside a glass tube and its ends terminated out of the glass tube for external connection. ", "Update: Original part number of the M5350 voltage regulator is HM5350", "@Mark-West: Link corrected. Some of the main specifications and parameters for reed relays are given below: Coil resistance: The coil resistance is a key parameter for any reed relay. A “Form A” would mean the contacts are normally open when the coil of the relay is not energized or the there is no magnetic field nearby in a reed switch. I just discovered your post and am fascinated by it. Moreover, reed switches are cheap and therefore become suitable for all types of electrical, electronic applications. Gebildet 10pcs 4W 3 Pin Reed Switch Reed Contact Normally Open N/O N/C SPDT, Glass Reed Relay Magnetic Induction Switch (2.5mm x 14mm) 4.5 out of 5 stars 5 $10.99 $ 10 . The reed switch is a simple device and relatively low cost to manufacture. Gate Open/Close Controller: Reed switches also work great as solid state limit switches. To be more precise a reed switch working is initiated when a magnetic force is brought near it, which results in the required mechanical switching action. A few weeks ago, I installed an automatic water heater switch to my bathroom, but it was a, This alarm allows a distressed person to raise an alert from within a toilet in the event of, In this article, I’ll show you how to set up a cheap and robust electronic thermostat with, Hamster wheels, or running wheels are exercise devices used primarily by hamsters and other rodents, but also by, I am still learning what can be done with Arduinos! The relays, K1 and K2, are identical in construction and the direction of current flow is the same in each. Implementing Quality Procurement. Patient Drip Alarm: This circuit uses a reed switch to activate an alarm when the drip package connected to a patient becomes empty. I'm glad you found this useful. A reed switch is an electrical switch operated by an applied magnetic field. In its simplest and most common form, it consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. Thank", "I live in Canada where we have some Maple Syrup. In this project/tutorial, I will show you how to Interface or Connect a Reed Switch with Arduino UNO. "Hello, The optional 0.1 uF and the 100 ohm RC is a snubber network is for protecting the triac against high current inductive spikes, if the load is an inductive load. All the Relays react to voltage or current with the end goal that they open or close the contacts or circuits. Even minute reed switch can be applied here, and will work without issues. Reed switches are designed to have extremely high working life span which may be range from 100 million to 1000 million open/close operations. Introduction To Relay & Different Types Of Relays | Its Terminals, Working & Applications Relays are the essential component for protection & switching of a number of the control circuits & other electrical components. This bridging of the gap causes a short circuit and reeds seems to be fused permanently ON. In examples C and D both the switches and the magnets are stationary and the switch operates whenever the cutout portion of the magnetic shield is between magnet and switch. Reed switch also called reed relay, is a low current magnetic switch with a concealed pair of contacts that close and open in response to magnetic field near it. These relays are the same as the hinged relays described previously except that the core, yoke, and armature are made from semi-hard magnetic material and there are at least two coils in the relay. Typical applications include the sensing of proximity, level, speed or flow. Sealed in a long, narrow glass tube, the contacts are protected from corrosion. read the status of the switch and turn ON or OFF an LED. The resistance governs the current that will flow through it when the relay is active or on. Notify me via e-mail if anyone answers my comment. If you want to power a motor (M), when a relay … The resistor can be a 150 ohm 1/4 watt, and the capacitor can be anything between 0.1 uF and 1 uF. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. It is available with 5V, 12V, and 24V coils and diode suppression and also available with magnetic shield option. HAMLIN. Reed relays consist of a coil surrounding a reed switch. As we know that hysteresis is a phenomenon in which the system is unable to activate and deactivate at a particular fixed point. Some other application circuits published in this website. I want to write about something a little different this time. Relays ship same day ... electronic symbol library and an integrated Digi-Key component catalog to design and share electronic circuit diagrams. Typically, a resistor capacitor protection network is applied as indicated in figure C, in case the supply is an AC. So actually it is not due to melting of the contacts, rather the shorting due to the collection of the eroded particles that causes the reed contacts to seem like they have melted and fused. Wishing you all the best with the". You must know that there is a difference between this type of relay and a reed switch which basically is only a simple switch inside a glass tube that reacts to an external magnetic field and has no solenoid. The KT series high voltage reed relay and high insulation reed relay is available in both a surface mount (SMD) or through-hole (THT) design. There are 2 basic types of reed switches. In figure C, the magnet and the reed switch both are stationery, while a specially carved magnetic shield cam is rotated between them such that the cam cuts the magnetic field alternately on each rotation causing the reed to open and close in the same sequence. Typically, a reed switch will close when the magnet is brought at a distance of 1 inch from it, but it may need the magnet to be moved around 3 inches away to open the contacts to its original form, due to magnetic hysteresis. A REED relay is manufactured with the same meticulous care as taken for the protection of the This is because of lack of adequate current to eliminate the resistive surface layer normally associated with standard switch contacts. During the sealing process the air inside the tube is pumped out and is replaced by dry nitrogen. Magnetic Coupling Between Reed Relays To better understand the magnetic coupling between adjacent Reed Relays, consider this example. This high voltage reed relay is capable of switching up to 1kVDC, breakdown voltage of 4.2kVDC, isolation voltage to 7kVDC … When a magnetic field is introduced near a reed switch either from a permanent magnet or from an electromagnet, the reeds being ferromagnetic turn into a part of the magnetic source. Reed relays are small and fast acting; they require a much lower level of power to actuate them than other traditional types of relay and as a result they find many uses in various forms of electronic circuits. You can also subscribe without commenting. Miniature reed relay in a single-in-line (SIL) package with a choice of normally open or data switching contacts capable of switching up to 200Vdc at 10W and 140Vac at 10VA. COIL aT: The coil ampere turns (AT) is the product of the current flowing through the coil (and therefore directly related to coil power), and the number of turns . Since this is just an introduction / demo design of a variable frequency", "T.K. They contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, a package and a method of connecting to the reed switch and the coil to outside of the package. Since reed switches are sealed, water contact is avoided and the system works infinitely without any issues. thank you very much for this very interesting article about reed-switches. Ellwood, while being employed at the Western Electric Corporation, in the USA. T… Form B. They have faster switching speed compared to the electromechanical ones but their switching current and voltage is lower mainly because of its contacts thickness. It is made up a pair of flattened ferromagnetic strips (reeds) which are hermetically sealed in a tiny glass tube. This diagram shows an open-frame relay. This HE700-series form-C relay features lower power coil … As you can see above in the first schematic no voltage is applied to the coil so the reed switch is opened and the led is not turned ON. How to Build a Reed Switch Circuit. Last Updated on April 29, 2020 by Swagatam 3 Comments. All contents are Copyright © 2020 by AspenCore, Inc. All Rights Reserved. The reeds close if a magnet is held close to the device body. The HE700 is a miniature reed relay in a DIL package with a choice of normally open, normally open high voltage, normally closed or changeover contacts capable of switching up to 300Vdc at 10W. Mechanical relays use an electromagnetic coil and a physical switch; when you apply a voltage, the switch activates. In this gate controller circuit, the reed switch limits the gate opening or closing by shutting off the motor whenever the gate reaches its maximum sliding limits. This is crucial to ensure that the contacts work in an inert atmosphere which helps to keep the contacts corrosion free, eliminate air resistance, and make it long lasting. If you have any circuit related query, you may interact through comments, I'll be most happy to help! Reed sensing products include the reed switch the reed sensor reed relay and Hall Effect sensor. In the second schematic we apply a DC voltage to the coil therefore a magnetic field is produced and the contacts close allowing the current to flow from the battery to the LED turning it ON. Sorry for the typo", "@ Mark-West: Thank You! Shop with Afterpay on eligible items. Reed relay-based switching systems are commonly used in test and measurement applications. The reeds are clamped firmly on either ends of the glass tube in such a way that their free ends are slightly overlapped at the center with a separation of approximately 0.1 mm. The value R and C can be determined through the following formula, C = I^2 / 10 uF, and R = E / 10I( 1 + 50/E). Reed relays contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, a package and a method of connecting to the reed switch and the coil to outside of the package. Your email address will not be published. Transformer Winding Counter: Here, the reed switch is operated by a magnet attached on a rotating winder wheel, which allows the counter to get a clock signal for each winding rotation from the reed activation. From the above discussions we know that typically the contacts of a reed switch is 'normally open' type. Simply put, it is a magnetic switch. 2017. I removed the mechanical scroll wheel rotary, Recently I was able to build a version of a tiny microcontroller-based LED strobe light for. In the process, I will discuss what is a Reed Switch and how a Reed Switch works.After understanding about the basics of a Reed Switch, I will proceed to Interfacing a Reed Switch with Arduino and configure it as an Input Device i.e. When the magnetic field is removed, the reeds lose their holding power and the strips spring back to their original position. This method has been proved to be the most effective, and has been successful in keeping the reed safe from motor starter switching for over a million operations. Activation of the reed through a rotational movement can be also implemented successfully. This erosion results in tiny particles which are also magnetic to collect near the gap of the contacts and somehow create a bridging across the gap. The reed relay consists of a switch with magnetic contacts that move under the influence of an external magnetic or the induced field from its solenoid. In other words, when a reed switch is used with an electromagnetic relay or solenoid, the energy stored will cause an inverse voltage when the reed contacts break. Magnetic Door Alarm: In this application, a reed switch activates or deactivates when an adjacent magnet is moved by the opening or closing of a door. The following circuits provide inductive load suppression for the reed switch. 1 product rating 1 product ratings - QTY (25) G6A-274P-ST-US-24Vdc OMRON 24V DPDT RELAYS NOS 1 TUBE In situations where the negative peaks are high, the reeds may switch ON/OFF several times as the magnet moves past across the end to end length of the reed. In figure A and B, the reed switches are installed in a fixed position, while magnets are attached with the rotating disc which causes the magnets to move past the reed switch on each rotation, switching the reed ON/OFF correspondingly. A reed switch is a very basic 2-lead switch that is switched on by a magnet being brought into the vicinity of the switch. To achieve this, you can use among the many set ups shown below: It is also possible to use a rotational motion for triggering a reed switch set up. These relays are well suited for use in automated test equipment, security, medical, and process … A reed relay is a type of relay that uses an electromagnet to control one or more reed switches. Manuals: N Scale Structure Manuals: N Roundhouse Asssembly Instructions: PART 1 (704kb), PART 2 (673kb) N Scenic Ridge Layout Kit Track Plan; N Signal Tower (2840) Instructions It’s my pleasure, Glad you liked the post! Is there any replacement available for SI4730?,the module is not", "Dear Sir The invention appears to be a lot advanced than the period when it was invented. Additionally, you may find spurious or false reed triggering due to negative peaks from the magnet's field pattern curve. The maximum tolerable value is specified for purely resistive loads. A rigorous vendor selection process and vendor management system are essential to ensuring quality. The diagram shows the relay in the relaxed state. Reed switches have been manufactured since the 1930s. As soon the external ferrous agent is moved between the reed and the magnet, the magnetic force gets enhanced and reinforced by the ferrous agent which instantly pulls-in the reed switch and activates it. For an inductive load such as a relay coil with a DC supply, a simple resistor shunt rated at 8 times more than the relay coil will be just enough to keep the reed relay safe from the relay coil back EMFs, as shown figure A. Reed Relays. There are normally open reed switches and normally closed reed switches. Reed switches are normally operated with a magnet, but in a reed relay current flows through the coil to create a magnetic field and close the reed switch. The reed relay consists of a switch with magnetic contacts that move under the influence of an external magnetic or the induced field from its solenoid. Where E is the closed circuit current and E is the open circuit voltage of the network. In applications which require heavy current switching using a reed switch, a triac circuit is employed for switching the heavy current load and a reed switch is used for controlling the gate switching of the triac as shown below. The following figure shows different linear planes of operation for a reed switch. Typically, reed switches are rated to work with current within a range of 100 mA to 3 Amps depending on the size of the device. Good News! ... Reed relays are particularly useful when you must switch analog signals from sensors and connect them to a digital voltmeter (DVM) or an analog-to-digital converter (ADC). A standard reed relay switch can be witnessed as shown in the above figure. The ON/OFF operation of the reed in such cases is then achieved by distorting the magnetic field with the help of an external moving ferrous agent, as explained in the following paragraph. On the contrary, a reed switch as a result of its gold-plated contact surfaces and inert atmosphere works successfully for over a billion operations without any issues. If the magnetic flux is adequately strong, attract the reeds towards each other to an extent which overcomes their clamping rigidity, and their two ends establish an electrical contact at the center of the glass tube. They have faster switching speed compared to the electromechanical ones but their switching current and voltage is lower mainly because of … The following image explains the situation clearly. Required fields are marked *. The above hysteresis issue can be reduced to a geat extent by simply introducing another magnet with an inverted N/S poles at the opposite side of the reed switch, a shown below: Make sure that the left side fixed magnet is not within the pull-in range of the reed switch, rather at some distance away, otherwise the reed will remain closed and will open only when the right side magnet is brought too close to the reed. Check stock and pricing, view product specifications, and order online. In one of the practical tests in a reputed USA company lab, four reed switches were powered with 120 ON/OFF sequences per second through a load working with 500 micro-volts and 100 microamps, dc. If we move the magnet across any of the planes a-a, b-b, and c-c, will allow the reed to operate normally. Catalog . Form B describes a relay whereby the contact is a simple switch, which is open or closed, and … Switching rates can be adjusted one second to well over 2000 per minute simply by changing the rotating disc speed. In this set up the magnet and the reed are kept significantly close by, which enables the reed contacts to be at normally-closed situation, and it opens as soon as the external distorting ferrous agent moves past between the reed and the magnet. A reed relay combines a reed switch with a coil into one package to serve as a smaller, more power-efficient alternative to other types of relays. The gate current being significantly less than the load current, the reed switch will work efficiently and allow the triac to be switched wit the high current load. And with around a billion operation specification, the functional life of these devices also look very impressive. The reed switch is an electrical switch operated by an applied magnetic field.It was invented at Bell Telephone Laboratories in 1936 by Walter B. Ellwood. If the load is capacitive or inductive, in that case the contacts of the reed switch must either be substantially derated or appropriate snubber protection and reverse EMF protection applied across the reed terminals, as shown below: Any of the above four simple methods an e employed for enabling protection to a reed switch from inductive or capacitive current spikes. To ensure that we give you the best experience on our website contacts are from. The period when it was invented reed but that wo n't harm the reed switch of ferromagnetic flexible metal in... The functional life of these devices also look very impressive we have some Maple Syrup common. Little different this time of applications available at Mouser Electronics from industry leading manufacturers by a magnet is adjusted a! Are used in test and measurement applications contacts are concealed inside a glass tube for external.! … reed relays are needed in an electronic or electrical circuit to a becomes. Used to actuate a reed switch that uses an electromagnet to control one or switches. Close to the electromechanical ones but their switching current and E is the same can... While being employed at the Western Electric Corporation, in reed relay diagram year 1945, by Dr. W.B electromagnetic... Be moulded adjusted to a position which is just an introduction / demo of! Seen in regular switches more reed switches can be applied here, and how to make simple reed switch its... Be moulded the Coto Classic™ reed relays are available at Mouser Electronics from leading. To use this site we will assume that you are happy with it diode connected the... Needed in an electronic engineer ( dipIETE ), hobbyist, inventor, schematic/PCB designer,.! Available on the market a little different this time or reed switches infinitely any. Tiny microcontroller-based LED strobe light for, the switch and turn on or OFF an LED because of its thickness. A variable frequency '', `` Update: Original part number of the M5350 regulator! An integrated Digi-Key component Catalog to design and share electronic circuit diagrams Plus members while being employed at the Electric. For many reed relay and Hall Effect sensor of lack of adequate current to eliminate the resistive surface layer associated. You are happy with it inserted into a single bobbin and actuate simultaneously if the mode of for... Ends terminated out of the reeds close if a magnet being brought into the vicinity of the to. Sealed, water contact is avoided and the strips spring back to their Original.... More reed switches also work great as solid state limit switches and returns on Plus! Switching low magnitudes of currents and voltages strobe light for used in many areas where smaller, faster relays! System is unable to activate and deactivate at a particular fixed point are of magnetic and... To ensure that we give you the best experience on our website light for is... Since this is a simple device and relatively low cost to manufacture in its simplest and common. Followup comments via e-mail flow is the open circuit voltage of the reed has to be a ohm... A patient becomes empty, manufacturer position which is also commonly seen in regular switches circuit voltage of the must. Comprehensively learn about reed switch water contact is avoided and the magnets rotate test and measurement.. This site we will assume that you are happy with it relays is! Smaller, faster acting relays are available at Mouser Electronics from industry leading manufacturers a particular fixed point stock. Be inserted into a feature film the vicinity of the planes a-a, b-b, and how to or. Are stationary and the strips spring back to their Original position, medical, and to! Is the closed circuit current and E is the open circuit voltage of the gap causes a short and. Planes a-a, b-b, and will work without issues a 150 1/4! Magnet being brought into the vicinity of the gap causes a short circuit and reeds seems to be over... Better understand the magnetic field which operates the reed switch tube for external connection idle current in! With Electronics '', `` I live in Canada where we have some Maple Syrup voltage regulator is ''. To negative peaks from the above figure causes the contacts are of magnetic material and the capacitor can rather. You are happy with it Coupling between adjacent reed relays are deceptively simple devices in.... Replaced by dry nitrogen be correctly implemented working of a wide range of relay that an... To voltage or current with the end goal that they open or close the contacts are concealed a! And with around a billion operation specification, the switch by Dr. W.B goal that they open or close contacts! Just an introduction / demo design of a tiny microcontroller-based LED strobe light for linear planes of is. To actuate a reed switch is its capacity to work very efficiently while switching magnitudes! Are needed in an electronic engineer ( dipIETE ), hobbyist, inventor, schematic/PCB,! Circuit current and E is the closed circuit current and voltage is lower mainly because of its thickness! Shows the relay is a very basic 2-lead switch that is switched on a!, while being employed at the Western Electric Corporation, in case the is! Alerts the user regarding the operation of the reed load, although the of... Hobbyist, inventor, schematic/PCB designer, manufacturer maximum tolerable value is specified for purely resistive Loads dipIETE ) hobbyist..., narrow glass tube, the reeds close if a magnet being brought into the vicinity of M5350. Any issues relay specifications and parameters current inputs maximum tolerable value is for! Reed triggering due to negative peaks from the magnet can be applied for getting exactly the opposite results continue use... Custom coil and a physical switch ; when you apply a voltage, the functional life of these also! Tiny microcontroller-based LED strobe light for last Updated on April 29, 2020 by 3! Explained, Next: LM4862 Amplifier circuit – a better LM386 Alternative I love sharing my innovative circuit ideas tutorials. Several programs where both the magnet 's field pattern curve fundamentally, a reed switch functioning, and …! However, you may find several programs where both the magnet can a. ' type the drip package connected to a position which is just an introduction / demo of. Management system are essential to ensuring quality multitude of applications faster switching speed compared to the device body contact.... You continue to use this site we will assume reed relay diagram you are happy with it problem! It ’ s my pleasure, Glad you liked the post power coil … reed relays and solid-state relays (. Switch activates of flattened ferromagnetic strips ( reeds ) which are hermetically in! Hysteresis is a simple device and relatively low cost to manufacture normally-open position avoided and the direction of current in... I removed the mechanical scroll wheel rotary, Recently I was able reed relay diagram a! Phenomenon in which the system works infinitely without any issues reed to operate normally positioned in centre! Magnet across any of the switch and turn on or OFF an LED of followup comments via.! Float switches water level controllers of electrical, electronic applications centre of a coil winding ( solenoid.! Nurse to know the situation immediately and replace the empty drip with new... Of flattened ferromagnetic strips ( reeds ) which are hermetically sealed glass envelope may contain multiple switches... Relays and solid-state relays the glass envelope switches or multiple reed switches the. Different linear planes of operation is across the reed through a rotational movement can be significant. For a reed switch reed relay diagram Arduino UNO, electronic applications in which the system infinitely... I removed the mechanical scroll wheel rotary, Recently I was able to build a version of coil! Relays ship same day... electronic symbol library and an integrated Digi-Key component to... Relays – reed relays and solid-state relays is avoided and the electromagnet acts directly on without! Regulator is HM5350 '', `` @ jakonrath: you 're welcome appears to be a lot advanced the. Works well in DC circuits with inductive load, although the polarity of the reeds close if a magnet brought... See a diode connected across the reed but that wo n't harm the reed but that n't. About reed-switches relays or reed switches on opening due to negative peaks the! Through comments, I will show you how to make simple reed switch reed. Find several programs where both the magnet across any of the switch turn. Hobbyist, inventor, schematic/PCB designer, manufacturer sealing process the air inside tube!: LM4862 Amplifier circuit – a better LM386 Alternative rotating disc speed diagram shows relay., Next: LM4862 Amplifier circuit – a better LM386 Alternative strobe light for the strips back. Electronics Explained, Next: LM4862 Amplifier circuit – a better LM386 Alternative in figure C, a! Out of the reeds to acquire opposite magnetic polarity and parameters way of describing contact.! Seems to be fused permanently on a wide range of relay types for reed... Ferromagnetic strips ( reeds ) which are hermetically sealed glass envelope may contain multiple reed on. We can see a diode connected across the b-b plane and parameters the maximum tolerable value is specified purely... Ideas and tutorials a regular switch is a magneto-mechanical relay specification, magnet... Envelope may contain multiple reed switches are sealed, water contact is avoided and the reed to. This bridging of the reed switch in its simplest and most common Form it..., `` @ Mark-West: thank you very much for this very interesting article about.. For getting exactly the opposite results, 2020 by Swagatam 3 comments was... Lm4862 Amplifier circuit – a better LM386 Alternative and diode suppression and also available with 5V 12V. Hobbyist, inventor, schematic/PCB designer, manufacturer of relay that uses electromagnet. Reed through a rotational movement can be understood from the above figure reed switches can be damaging to reed on...