Reed switches, also known as reed switch sensors or reed sensor switches, are a specialised type of electrical switch that is actuated by a magnetic field. The most common design features two thin, flexible, ferromagnetic metal wires or blades, referred to as the reeds, positioned slightly apart in a hermetically sealed glass capsule. These reeds serve as the reed switch contacts. It's worth noting that the change-over type, a variation within the reed sensor family, employs three reeds instead of the standard two, offering more complex switching capabilities
Read our guide to reed switches to learn more.
There are various types of reed switches, including normally open, normally closed, and changeover or SPDT reed switches, providing diverse solutions for various magnetic sensing needs
Normally-open reed switches, a common type of reed sensor, remain open until a magnetic field is applied. Upon exposure to a magnetic field, the reed contact sensor closes, completing the circuit. This functionality is ideal for applications requiring a switch to activate only when a magnetic field is present, such as in security systems or proximity sensors.
Conversely, normally-closed reed switches maintain a closed circuit until a magnetic field is introduced. When subjected to a magnetic field, the reed sensor switch opens, interrupting the circuit. This configuration is useful in applications where a circuit needs to be deactivated upon magnetic field detection, like safety interlocks or alarm systems.
Changeover or SPDT reed switches, also known as reed contact switches, provide both normally open and normally closed contacts within a single unit. These switches facilitate the switching between two distinct circuits. When a magnetic field is applied, one circuit opens while the other closes, offering versatile control in applications requiring circuit alternation or signal routing.
Magnetic reed switches, including micro reed switch and heavy duty magnetic reed switch variants, offer several distinct advantages, making them a reliable choice for a wide range of applications:
When selecting a reed sensor switch, several critical factors warrant careful consideration:
When purchasing reed switches, it's crucial to avoid several common pitfalls to ensure optimal performance and longevity.
In security systems, reed switches act as reliable intrusion detectors. Normally-closed reed switches are often used in door and window sensors, triggering alarms when a magnetic field is disrupted, indicating unauthorised entry.
Within the automotive sector, reed switches play a crucial role in position sensing and fluid level monitoring. Magnetic reed switch sensors are commonly found in fuel level sensors and door interlocks, ensuring accurate and dependable performance.
Medical devices utilise reed switches for their compact size and reliability. Micro reed switches, in particular, are employed in pacemakers and other implantable devices, providing precise switching functions while maintaining biocompatibility.
Industrial automation systems rely on heavy duty magnetic reed switches for position sensing and limit switching. Their robust design withstands harsh environments, ensuring accurate and consistent performance in automated machinery.
In telecommunications, reed switches find applications in signal routing and switching circuits. For example, reed contact sensors are used for their high switching speeds and low contact resistance, contributing to efficient signal transmission.
Reed sensors are employed in various household appliances, such as washing machines and refrigerators, for level sensing and door interlocks. Their durability and reliability ensure consistent operation in everyday use.
RS Australia stands as a trusted supplier, distributor, and manufacturer of high-quality reed switches, including magnetic reed switches and reed sensor switches. We source our products from reputable brands like KEMET, Assemtech, and Littelfuse, ensuring superior quality.
Beyond reed switches, RS Australia provides a comprehensive range of electrical products, such as DC power connectors and copper wiring, offering a convenient one-stop shop for your project needs. Browse our user-friendly website and order today to benefit from swift and flexible deliveries, meeting all your project requirements efficiently.
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