Function and Usage
The NU6-III series surge protective device (hereinafter referred to as the surge protective device) is used in single-phase power distribution systems with an AC frequency of 50Hz/60Hz and a rated operating voltage of 230V. It meets the III class test, with an open-circuit voltage peak of up to 10kV (1.2/50μs) and a short-circuit current of up to 5kA (8/20μs). It suppresses transient overvoltage amplitude and discharges surge energy, thereby protecting the system circuit and load equipment. It is suitable for coordinated use with other series surge protective devices to achieve a layered protection system, thus providing more extensive and effective protection for low-voltage distribution systems. It complies with the standards: GB/T 18802.1, IEC 61643-1, EN 61643-11, and has obtained CQC, CE, CB, and other certifications.
Details Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| Basic Parameters and Technical Performance Indicators | Test Category | Class III |
| Open Circuit Voltage Uoc(kV) | 10 |
| Short Circuit Current Isc(kA) | 5 |
| Maximum Continuous Operating Voltage Uc(V~) | 275, 320, 385 |
| Voltage Protection Level Up(kV) | 1.5 |
| Poles | 1P+N, 2P |
| Connecting Conductor (mm) | ≤ 16 (M4), ≤ 25 (M5) |
| Tightening Torque (N·m) | 1.5 (M4), 2.0 (M5) |
| Protection Level | IP20 |
| Transient Overvoltage (TOV) Characteristics | Low Voltage TOV, Withstand Mode (U<sub>1</sub>=336V, t<sub>1</sub>=5s); Fault Mode (U<sub>1</sub>=442V, t<sub>1</sub>=120min); High Voltage TOV Not Applicable |
| Dimensions | See Figure 2, Figure 3 |
| Back-up Protective Fuse | NB1-63 C10 |
| Short Circuit Current Withstand Capability (kA) | 3 |
| Communication and Indication | Remote Signal Function | The remote signal function can be selected as needed; the indication function is shown on the product indicator ring. |
| Operating Status/Fault Indication | Green (Communication Terminal 11 → 14 Normally Open, 11 → 12 Normally Closed)/Red (Communication Terminal 11 → 14 Normally Open, 11 → 12 Normally Open) |
| Remote Signal Wiring Terminal Wiring Capacity | Maximum 1.5mm² |
| Remote Signal Contact Switching Capacity | 250V/0.5A; 75V/0.5A |
| | 250V/0.1A; 75V/0.5A |
