Function and Application
The NJXB1 series low-voltage line protector (hereinafter referred to as the protector) is a multifunctional integrated line protector. It is suitable for AC low-voltage lines with an AC frequency of 50Hz, rated insulation voltage up to AC690V, and rated operating current from 1A to 800A for continuous or intermittent operation. It integrates protection, measurement, control, communication, and maintenance, and can meet various application scenarios. Its comprehensive protection functions ensure the safe and stable operation of the line. The product adopts a modular design concept, and users can select and customize functions according to their needs to adapt to various application scenarios.
Detailed Description
Parameters:
Rated Current Specifications (A): 05, 20, 40, 100, 300, 800
Rated Operating Voltage Ue(V): AC220V~440V or AC380V~690V (H type)
Rated Control Circuit Power Supply Voltage Us (V), Frequency (Hz): AC110V~AC240V, 50Hz/60Hz; DC110V~DC350V
Detail Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| 4.1 Product Rated Control Power Supply Voltage | AC110V~AC240V, 50Hz/60Hz; DC110V-DC350V | |
| Main Circuit | Rated Insulation Voltage | AC690V |
| Rated Frequency | 50Hz |
| Rated Impulse Withstand Voltage | 1.2/50μs, 4kV |
| Model Specifications | Set Current Range (A) | Rated Short-Circuit Current Limit (KA) Rated Insulation Voltage Ui V |
| NJXB1-05 | 1-5 | 125 AC690 |
| NJXB1-20 | 4-20 | |
| NJXB1-40 | 8-40 | |
| NJXB1-100 | 20-100 | 1000 |
| NJXB1-300 | 60-300 | |
| NJXB1-800 | 160-800 | |
| 4.2 Basic Parameters of Auxiliary Circuit | Number of Contacts | Agreed Heating Current Ith A Usage Category Rated Working Voltage Ue V Rated Working Current Ie A Rated Insulation Voltage Ui V Rated Impulse Withstand Voltage Uimp (1.2/50μs) kV |
| 3 Normally Open, 1 Normally Closed | 3 AC-15 AC240 1.5 AC415 2.5 |
| | DC-13 DC30 1 |
| 4.3 Product Functions | Basic Protection Functions | Instantaneous Trip Protection, Inverse-Time Overcurrent Protection, Overcurrent Protection I, Overcurrent Protection II |
| Extended Protection Functions | Time-Limited Instantaneous Trip Protection, Inverse-Time Zero-Sequence, Low-Time Limited Zero-Sequence, High-Time Limited Zero-Sequence, Current Demand, Low Voltage, Overvoltage, Current Unbalance, Negative Sequence Unbalance, Voltage Phase Disconnection, Overload, Under-Power, Reverse Power, Spring Energy Storage, Control Circuit, Process Interlock |
| Parameter Measurement | Three-Phase Current, Three-Phase Voltage, Zero-Sequence Current / Residual Current, Power, Energy Metering |
| Other Functions | RTC Clock, Event Record, RS485 Communication, 6 DI, 4 DO |
| 4.4 Structural Features | | |
| 4.4.1 Button setting of all protection parameters. | | |
| 4.4.2 TFT LCD screen displays three-phase current, voltage, power, and other electrical parameters and fault-related information. | | |
| 4.4.3 LED lights indicate the working status of the protector (operation, fault). | | |
| 4.4.4 Supports buttons, DI input, and communication control simultaneously. | | |
| 4.4.5 The main unit uses a panel mounting method, and the current transformer uses a rail mounting or device mounting method. | | |
| 4.4.6 Plug-in terminal blocks for easy wiring by users. | | |
| 4.4.7 Multiple current specifications are available. | | |
| 4.4.8 Has programmable 4mA~20mA analog output function. | | |
| 4.4.9 Multiple DO outputs for convenient realization of complex circuit control. | | |
