| Technical Parameter Items | Test Category | Class II |
| Maximum Discharge Current Imax (kA) | 20, 40 |
| Maximum Continuous Operating Voltage Uc (V~) | 255, 275, 320, 385, 440 |
| Nominal Discharge Current In (kA) | 10, 20 |
| Voltage Protection Level Up (kV) | 1.2, 1.5, 1.6, 1.8, 2.0 |
| Pole Number | 1P, 2P, 3P, 4P, 1P+N, 3P+N |
| Connection Wire (mm²) | ≤ 16 (M4), ≤ 25 (M5) |
| Tightening Torque (N·m) | 1.5 (M4), 2.0 (M5) |
| Protection Level | IP20 |
| Dimensions | See Figure 2 ~ Figure 3 |
| Back-up Fuse | See Table 3 |
| Short Circuit Current Withstand Capability (kA) | 5 |
| Transient Overvoltage (TOV) Characteristics | Uc: 275V, 320V, Low Voltage TOV, Withstand Mode (U1=336V, t1=5s), Fault Mode (U1=442V, t1=120min) | |
| Uc: 385V, 440V, Low Voltage TOV, Not Applicable (U1=336V, t1=5s), Fault Mode (U1=442V, t1=120min) | |
| Pole Number: 1P, 2P, 3P, 4P, High Voltage TOV Not Applicable | |
| Pole Number: 1P+N, 3P+N, High Voltage TOV Fault Mode | |
| Communication and Indication | Communication function can be selected as needed, indication function see product indicator window | |
| Working Status/Fault Indication | Green (remote signal terminal 11 → 14 normally open, 11 → 12 normally closed) / Red (remote signal terminal 11 → 14 normally closed, 11 → 12 normally open) |
| Communication Terminal Wiring Capacity | Maximum 1.5mm² |
| Communication Contact Switching Capacity | 250V/0.5A; 250V/0.1A; 75V/0.5A |
| Earthing System | TT | TN-C TN-S IT Note |
| Maximum Operation Voltage of the Grid Us.max | 345V | 253V 253V 400V Refer to IEC 60364-5-534 |
| NXU-Ⅱ | L-PE/N-PE Protection Mode*
Uc=275V, 320V | - 1P, 3P 2P, 4P - Not Suitable for Inductive Load |
| L-PE/N-PE Protection Mode
Uc=385V, 440V | 2P, 4P 1P, 3P 2P, 4P 3P (440V) |
| L-N/N-PE Protection Mode b
Uc=255V, 275V, 320V, 385V, 440V | 1P+N
3P+N - 1P+N
3P+N - It is recommended to choose 440V for inductive load |
| Selection of Back-up Fuse | | |
| Surge Protector Model | Maximum Discharge Current (kA) | Back-up Fuse Breaking Range |
| | Rated Current (A) |
| NXU-Ⅱ | 20 | 63 gL/gG |
| 40 | 125 gL/gG |
