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） Maximum continuous operating voltage Uc: 440V AC (L-PE).
Rated discharge current In : 40kA (8/20μs).
Maximum discharge current Imax: 65kA (8/20μs).
Voltage protection level Up: 2300V
Front empty open or fuse F: 40A
Top lead : ≥4mm2
Lower lead : ≥6 mm2
Mounting: 35mm DIN rail, EN60715 standard
Notice
There must be a reliable PE ground when using a power surge protective device.
When the transparent window is green during normal use, when the window turns red,
It means that the power supply lightning protector has failed, and it needs to be replaced with a new product in time.
Ordering and Model Selection（订货选型） | 文件名 | 描述 |
|---|---|
| KDY-65/440/2P | Modular Type B power surge protective device (SPD) for single-phase two-wire/three-wire power systems, featuring 65kA maximum discharge current (8/20μs) with standard DIN-rail mounting。 |
| KDY-65/440/3P | Modular Type B Surge Protective Device (SPD) for TN-C three-phase four-wire power systems, featuring 65kA maximum discharge current (8/20μs) with standard DIN-rail mounting。 |
| KDY-65/440/3P+N | Modular Type B Surge Protective Device (SPD) for TT three-phase four-wire power systems, featuring 65kA maximum discharge current (8/20μs) with standard DIN-rail mounting。 |
| KDY-65/440/4P | Modular Class B power surge lightning protector, suitable for TN-S three-phase five-wire power systems, maximum discharge current 65kA (8/20μs), standard rail mounting。 |
*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-65/440/4P Type 2 Surge Protective Device (SPD) PDF Document | Instruction manual | Download |
