What is SPST reed switch?
form a: single pull-single throw (spst), normally open (no) magnetic reed switch configuration. Upon removal of the magnetic field, the contacts will return to their Normally Open (NO) state, thereby opening the circuit and stopping the flow of electricity.
When would you use a reed switch?
Reed switches are primarily used for proximity and sensing applications and are more common than you may realise. Here are some everyday uses of reed switches: Alarm systems – A reed switch will be found in many alarm systems for sensing whether doors and windows are open or closed.
What is an example of a reed switch?
Reed switches actuated by magnets are commonly used in mechanical systems as proximity sensors. Examples are door and window sensors in burglar alarm systems and tamperproofing methods. Reed switches have been used in laptops to put the laptop into sleep/hibernation mode when the lid is closed.
How long do reed switches last?
The “heart” of all GEMS level and flow switches is a hermetically sealed, magnetic reed switch within the unit stem. If used within its current carrying capacity, the reed switch will last many years – 2 million cycles under ideal conditions.
How sensitive are reed switches?
With a magnetic sensitivity of 2 to 4 Ampere Turns (AT), typical operating time of 0.2 ms, and a typical release time of 0.1 ms, the reed switch is well-suited for very demanding applications such as hearing aids, pill cams, flip or slide phones, and laptop computers.
How much current can a reed switch handle?
On larger evacuated Reed Switches, ratings as high as 15,000 Volts DC are not uncommon. Some smaller evacuated reeds can stand off up to 4000 Volts DC. Small pressurized reed switches generally withstand 250 to 600 Volts DC.
How does a NC reed switch work?
An NC reed switch works the other way. The reeds are already in contact in their natural position, providing a closed circuit and allowing current to flow across the switch when no magnet is present. Introduction of a magnetic field with reversed polarity pushes the contacts apart, breaking the circuit.
Why does a reed switch fail?
what is a failure? Reed switches or relays eventually fail in one of three ways . They do not open when they should (usually called “sticking”), they fail to close when they should (“missing”), or their static contact resistance gradually drifts up to an unacceptable level .
How much does a reed switch cost?
$1.95. This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes.
How does a reed switch operate?
How Does a Reed Switch Work? The switching mechanism is comprised of two ferromagnetic blades, separated by only a few microns. When a magnet approaches these blades, the two blades pull toward one another. Once touching, the blades close the normally open (NO) contacts, allowing electricity to flow.
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