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.
KDY-I-25S/440/2P
KDY-I-25S/440/3P
KDY-I-25S/440/4P
Technical Parameters（技术参数） Nominal voltage Un : 220/380V AC
Maximum continuous operating voltage Uc: 440V AC
Nominal discharge current In: 25kA(8/20μs).
Impulse discharge current Iimp: 25 kA (10/350 μs).
The voltage protection level is Up: 2.5kV
Back-up protective SCB: KHB-I-25/4P or fuse: 315A
Top Lead L/N: ≥6mm2
Lower lead PE: ≥10mm2
Mounting: 35mm DIN rail,EN60715 standard
Notice
During installation, the PE end of the surge protector must be reliably connected with the nearest external earth end to provide a smooth discharge channel for the surge protective device.
Ordering and Model Selection（订货选型） The KDY-I-25S/440/4P is suitable for TN-S three-phase five-wire power systems.
The KDY-I-25S/440/3P is suitable for TN-C three-phase four-wire power systems.
The KDY-I-25S/440/2P is suitable for single-phase two-wire/three-wire power 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）
Download
| File name | Product type | Download |
|---|---|---|
| KDY-I-25S Power Surge Protector PDF Document | Instruction manual | Download |
