HAL549SF-K

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Magnetic Sensors - Switches (Solid State) are a type of switch requiring a magnetic field to trigger their operation. The HAL549SF-K is a single-pole double-throw switch that provides a maximum electrical rating of 1/2 A at 28V DC. The switch is enclosed in a plastic casing and is offered in both normally open and normally closed configurations.

The working principle of the HAL549SF-K is simple. It is triggered by the presence of a magnetic field. Its operation is based on the physics of ferromagnetism, where the reed switch and the magenetically permeable core within the switch interact to create a closing of the switch contacts. When a sufficient magnetic field is present, the magnetic flux generated by the magnet is strong enough to magnetize the core, which pulls the two metal contacts of the reed switch together, thus completing the circuit. When the magnet is removed from the field, the reed switch contacts open again and the circuit is broken.

When the HAL549SF-K is used as a proximity switch, the external magnet is placed in the sensing zone of the device and operates as the switch actuator. As the magnet moves away from the switch, the reed switch contacts will open, disconnecting the circuit. This is known as "normally open" mode and is useful for sensing when an object enters or leaves the sensing zone.

When the HAL549SF-K is used as a limit switch, the magnet is positioned at a distance such that when an object approaches it, the reed switch contacts will close, thus connecting the circuit. This is known as "normally closed" mode and is useful for sensing when an object hits a certain point in the sensing zone.

Given its superior electrical contact rating and operational safety, the HAL549SF-K is ideal for use in applications such as pedestrian door openers, touch-activated lighting systems, level switches, and many more. In these, and other, applications the HAL549SF-K is used to trigger an electrical circuit or activate some other device when a magnetic field is sensed.

To sum up, the HAL549SF-K is a single pole double throw switch that is activated by the presence of a magnetic field. Its operating principle is based on the physics of ferromagnetism and it is available in both normally open and normally closed configuration. It is equipped with superior electrical contact and operational safety, making it suitable for many applications. Its portability, accuracy and affordability make it one of the most widely used switches for sensing applications.

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