Products
Products
Installation & Application（安装应用） 
Installation Precautions
Non-Maintenance-Free Product
This surge protective device (SPD) is not maintenance-free. After installation, regular inspections must be performed to ensure proper operation.
Status Indicator
Normal operation: The transparent window displays green.
Failure alert: If the window turns red, the SPD has failed and must be replaced immediately.
Remote Signal (Dry Contact) Wiring Diagram
Product Dimension Drawing
Product Installation Diagram
Product Schematic Diagram
Technical Parameters（技术参数） Rated voltage (Un): 690V AC;
Maximum continuous operating voltage (Uc): 750V AC;
Nominal discharge current (In): 20kA (8/20µs);
Maximum discharge current (Imax): 40kA (8/20µs);
Rated short-circuit current (ISCCR): 300A;
Line-to-ground peak voltage: ≤1700V AC (5s withstand);
Voltage protection level (Up): ≤4kV;
Operating temperature (T): -40℃ to +85℃;
With remote signaling contacts: 1 NO (Normally Open) + 1 NC (Normally Closed);
Upper wiring L1, L2, L3: ≥4mm²;
Lower wiring PE: ≥6mm²;
Mounting method: 35mm DIN rail, EN60715 standard.
Ordering and Model Selection（订货选型） | Product model | Product description |
|---|---|
| NKP-40R/F750/1P+0 with remote signaling contact | Maximum continuous operating voltage (Uc): 750V AC; Voltage protection level (Up): ≤4kV; Standard DIN rail mounting。 |
| NKP-40R/F750/3P+0 with remote signaling contact | Maximum continuous operating voltage (Uc): 750V AC; Voltage protection level (Up): ≤4kV; Standard DIN rail mounting。 |
| NKP-40R/F750/3P with remote signaling contact | Maximum continuous operating voltage (Uc): 750V AC; Voltage protection level (Up): ≤3.5kV; Standard DIN 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）
