中文介紹 ：

LJ12A3-4-Z/BX NPN 直流三線常開 M12 4MM 接近開關是一種性能可靠的感應設備。它采用先進的感應技術，能夠精準地檢測到金屬物體的接近。當有金屬物體進入其感應范圍時，接近開關可以迅速響應，實現電路的導通，從而為自動化設備提供可靠的信號傳輸。這種接近開關的感應距離為 4mm，能夠滿足多種應用場景下的近距離檢測需求。其 M12 的螺紋設計，便于安裝和固定，可輕松適配各種機械結構。在工業自動化生產線上，它可以用于物體的定位、計數、限位等多種功能，有效提高生產效率和設備運行的穩定性。此外，該接近開關具有良好的抗干擾能力，能夠在復雜的電磁環境中穩定工作，確保信號的準確傳輸。

English Introduction ：

The LJ12A3-4-Z/BX NPN DC three-wire normally open M12 4MM proximity switch is a reliable sensing device. It employs advanced sensing technology to accurately detect the approach of metallic objects. When a metallic object enters its sensing range, the proximity switch can respond quickly to establish an electrical connection, thereby providing reliable signal transmission for automated equipment. With a sensing distance of 4mm, this proximity switch can meet the needs of close-range detection in various application scenarios. Its M12 threaded design facilitates easy installation and fixation, allowing it to be easily adapted to different mechanical structures. On industrial automated production lines, it can be used for functions such as object positioning, counting, and limiting, effectively improving production efficiency and equipment stability. Moreover, the proximity switch has strong anti-interference capabilities, enabling it to work stably in complex electromagnetic environments and ensuring accurate signal transmission.