Products
Products
Installation & Application（安装应用） AC System: When using KEJIA® KDY series power surge protectors for three-phase four-wire power systems, four units can be connected in parallel between the protected terminals and ground (L, N lines and PE), which is called the TN-S connection method. Alternatively, three units can be connected in parallel between L and N lines, with an additional gas discharge surge protector connected between N and PE lines, known as the TT connection method. For single-phase power systems, one surge protector can be connected in parallel between each of the L and N lines to ground (PE).
DC System: When using KEJIA® KDY series DC power surge protectors, two surge protectors can be connected in parallel between the two lines of the DC power system and ground (+, - lines and PE), and the PE terminal grounding must be reliable.
RS-485 Communication Series (optional): The power surge protector is a combination product of power surge protection and NKP-LJ-04 surge detection communication. This product features a high-brightness LED digital display that can collect the failure status of the surge protection module, lightning strike counts, and lightning strike occurrence times, and send signals to the background management system through the RS485 interface. For the button operations and communication methods of the NKP-LJ-04 communication module, please refer to its user manual.
Technical Parameters（技术参数） 
Ordering and Model Selection（订货选型） The KDY-20/320/4P surge protector is specifically engineered for TN-S three-phase five-wire power distribution systems.
The KDY-20/320/3P model is fully compatible with TN-C three-phase four-wire electrical networks.
Our KDY-20/320/3P+N variant is designed to support TT-C three-phase four-wire installations.
The KDY-20/320/2P unit is optimized for both single-phase two-wire and three-wire configurations.
The KDY-20/320/1P+N version provides dedicated protection for single-phase two-wire systems.
*Please send the inquiry email containing specific product requirements (such as model, quantity, technical parameters, etc.) to the designated email address salina@kejia.com.
（请将包含具体产品需求（如型号、数量、技术参数等）的询价邮件发送至指定邮箱 salina@kejia.com）
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