reed relay construction and working

The reed contact materials used include ruthenium, rhodium and sometimes iridium or where high voltages are involved it might be tungsten or molybdenum. electromagnetic relay, reed relay and solid state relay. Relays are found hidden in all sorts of devices. The resistance of the wire coil controls the amount of steady state current flowing through the coil and therefore the power the coil consumes when the contacts are closed. Reed relays offer many advantages and can be used to good effect in a number of situations. 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. All rights reserved. During large faults, the lower reed switch activates the trip circuit of the circuit breaker and interrupts the power supply to the transformer, thereby avoiding large accidents. Reed relays and reed switches are used in many areas where smaller, faster acting relays are needed in an electronic or electrical circuit. The larger switches may be more mechanically robust and have greater contact area, improving their signal carrying capability. Each reed relay assembly will have an associated magnetic field that extends beyond the mechanical confines of the relay itself. Relays are electrically operated switches, which allow a low-level electrical signal to control a separate larger electrical voltage or current. With enough applied field the blades make contact and electrical contact is made. Connectors     As the magnetic field close to the contacts increases, so too does the strength of the magnetisation of the contacts. The key to understanding how they work is to realize that they don't just work as an electrical bridge but as a magnetic one as well: magnetism flows through them as well as electricity. How does a reed switch work? Transistors, MOSFETs, Solid State Relays, and Mechanical Relays all allow you to turn devices on and off based on inputs and decision making processes. Most (but not all) reed switches have open contacts in their normal state. It works on the principle of an electromagnetic attraction. Electromagnetic Relay • It uses electromagnet to mechanically operate a switch. Solid state relay. This type of construction facilitates easy removal and replacement of the relay(s) in the event of failure. Electromagnetic relays 2. The relays, K1 and K2, are identical in construction and the direction of current flow is the same in each. Other Benefits of Relays Aside from the ability to allow a relatively small electrical signal to switch a relatively large electric signal, relays also offer electrical isolation between coil … The contacts may be normally open, closing when a magnetic field is present, or normally closed and opening when a magnetic field is applied. Reed relay is made up of a reed switch & an electromagnetic coil with a diode for back EMF. Reed Relays are available at Mouser Electronics from industry leading manufacturers. These relays are employed as auxiliary relay, control relay, over current, under current, over voltage, under voltage and impedance measuring relays. Attraction armature type relay is the most simple in construction as well as its working principle. 2 Comments / Uncategorized / By Steve Spence. Solid State Relays We will discuss all of them in detail below. The individual tubes for each reed switch are melted at either end, to provide a hermetic seal. The reed acts as blade as well as an armature. Rather than using a bar magnet as shown for the purposes of the explanation, a coil is normally used - this assembly then becomes the whole reed relay, i.e. These are sealed with a glass tube. The Birth of Pickering Reed Relays First sales order in 1968. Part Two will continue to explain the wonders that are reed relays. Once the best reed switch component is chosen, those reed needs to be assembled into a reed relay. Short reeds are often made of thinner materials so they deflect more easily but this clearly has an impact on their rating and contact area. Different reed switches require different levels of magnetic field to close the contact, and this is usually quoted in terms of the ampere turns (AT) – simply the product of the current flowing in the coil multiplied by the number of turns. Hareendran - 12/23/20. We use cookies to enhance your online experience. The switches could be used along with small magnets for various position sensing applications, as well as for use in test and measurement matrix switches. A few weeks ago, I installed an automatic water heater switch to my bathroom, but it was a . In addition to this, reed switches and relays were used in a host of other applications.     Return to Components menu . These strips are known as reed. The reed switch is considered to have no moving parts, and that means there are no parts that mechanically wear. Phototransistor     Relay circuits     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. Reed switches can be used with permanent magnets (for example to detect doors closing) but for the reed relays the field is generated by a coil which can have a current passed through in response to a control signal. It works by placing a magnetic field close to the reed switch contacts. The reed switch has two shaped metal blades made of a ferromagnetic material (roughly 50:50 nickel iron) and glass envelope that serves to both hold the metal blades in place and to provide a hermetic seal that prevents any contaminants entering the critical contact areas inside the glass envelope. The upper reed switch (attached to the upper float switch) is connected to an alarm circuit and lower reed switch (attached to the lower float switch) is connected to the trip circuit of the circuit breaker at the incoming side of the transformer. As current is passed through the coil, so this creates a magnetic field and the contacts become magnetised, and are attracted to each other. Determine the applicability for any given situation deal of variation in the open state between... Also give rise to excessive pickup in other circuits and this may impact the EMC performance magnetic. First sales order in 1968 operated by a magnetic field close to contacts! Magnetic fields will adversely affect each other of Pickering reed relays and reed switches are used in a long narrow. Favorite mechanical relays is that there is a type of relay that uses electromagnet. Have an associated magnetic field needs to be used for automatically operated exchanges this explanation a bar is... 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