OHS3120U

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Magnetic Sensors - Switches (Solid State) are a type of electrical switch that uses a magnetic field to switch electrical current on and off. The OHS3120U is one example of such a switch, and it is often employed in electronics due to its ability to quickly switch states and provide reliable operation.This article discusses the OHS3120U application field and working principle in detail. First, the applications of the OHS3120U will be explored. Then, the working principle will be examined. Finally, the advantages and disadvantages of this type of switch will be discussed.

Applications

The OHS3120U is commonly used in industrial and automotive applications where current flow switching is required. In particular, it is an ideal choice for equipment that needs to quickly switch between operating states, such as programmable logic controllers (PLCs), factory automation systems, and automotive systems. It can also be used in harsh or hazardous environments, where physical switches or buttons would be hazardous. Additionally, the OHS3120U is often employed in aerospace systems as an “on/off” switch or as part of a larger system requiring current flow switching.

Working Principle

The OHS3120U switch works by using a built-in reed switch to detect a magnetic field. To initiate the current flow through the switch, a magnet must be placed in proximity to the reed switch, which causes the reed switch to close and provide a path for current to flow through the switch. When the magnet is removed, the reed switch opens and the current flow is interrupted. The OHS3120U switch is also equipped with safety features to ensure reliable operation in hazardous environments, such as multiple integral coils and the ability to fully disconnect the reed switch when the magnet is too far away. This helps prevent any potential current surges or short circuits.

Advantages

The OHS3120U switch offers several advantages, such as:

• These switches are extremely reliable and are capable of quickly switching between operating states.
• The safety features help protect the device from potential current surges and short circuits.
• The OHS3120U is relatively inexpensive, making it an ideal choice for cost-effective applications.
• The switch is also IP65 rated for protection against water and dust.

Disadvantages

The OHS3120U switch also has some potential drawbacks, including:

• The switch is not designed for power switching applications, and may be prone to failure under high current loads.
• The switch may require the use of an additional controller or relay if the application requires switching power and AC current.
• The switch is sensitive to external magnetic fields, which can interfere with its operation.
• There is a potential for false switching if the external magnetic field is too strong.

Conclusion

The OHS3120U switch is ideal for applications that require fast and reliable current flow switching. The switch is relatively inexpensive and offers several safety features to ensure reliable operation. However, the switch is not designed for power switching or AC current switching, and may be prone to failure in environments with strong external magnetic fields.

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