Intelligent low-voltage line protection devices are suitable for systems with rated voltages up to AC 660V (default 380V), rated currents up to AC 800A, and rated frequencies of 50/60Hz. They provide comprehensive intelligent protection for feed line terminals. They protect against faults such as short circuits, overcurrents, zero-sequence overcurrents, low voltage, and overvoltage during feed line operation. The protective device adopts a modular product structure, including the main unit (protection, measurement, and control function module), transformer modules, featuring complete electric quantity measurement functions. It also offers switch input monitoring, fault recording, analog signal transmission, and communication functions, allowing for easy connection to factory DCS systems for automated control. Control and protection for loads above 800A can be achieved through a 5A dedicated transformer.
Product Features
Auxiliary Power Supply: AC/DC 85~270V
Measurement Functions (Current, Voltage, Power, Energy, Zero Sequence/Leakage Current)
A comprehensive protection function featuring rapid, time-limited rapid, inverse-time overcurrent, time-limited overcurrent, unbalance, zero-sequence protection, overvoltage, undervoltage phase I, undervoltage phase II, and PT open-circuit protection, etc.
8-way DI passive dry node input; utilizes an internal DC15V power supply for signal and power.
4-way DO output for circuit breaker protection, remote control, and alarm.
Standard RS-485 communication interface with Modbus-RTU protocol ensures fast and reliable communication with the host computer.
Features a DC4-20mA analog output interface, directly connectable to DCS systems, enabling on-site equipment monitoring.
Equipped with a system clock and 50 event logging capabilities, the system clock records the current time (year, month, day, hour, minute, second, millisecond); the fault logging function records the time and cause of system malfunctions.
The display is equipped with a Chinese dot matrix LCD screen, offering a user-friendly interface.
Can replace various conventional components such as voltmeters, signal lights, thermal relays, and current transmitters, reducing the amount of cable connections inside the cabinet and on-site construction. It offers higher reliability and overall cost-effectiveness compared to traditional solutions.
With integrated multiple protection features, the low-voltage line protector can quickly respond to various fault conditions, cut off the faulty circuit, prevent the fault from spreading and expanding, ensuring the stable operation of the electrical system.
Feature Configuration
| Type and Function | Feature Configuration | |||
| Standard Features | Enhanced features | |||
| Protective Function | Instant decision | √ | ||
| Speed limit cutoff | √ | |||
| Inverse-time overcurrent | √ | |||
| Time-delayed overcurrent protection | √ | |||
| Unbalanced Protection | √ | |||
| Residual Current (Select one only) | Zero Sequence (Self-produced) | √ | ||
| Zero Sequence (Transformer Connection) | √ (Zero Sequence) | |||
| Leakage (Transformer Connection) | √ (Leakage) | |||
| Under-voltage, over-voltage | √ | |||
| PT Disconnection | √ | |||
| Anti-surge module | √ | |||
| Communication Features | RS485 Interface Communication Protocol: MODBUS-RTU | √ | ||
| Switched quantity input | 8-way DI | √ | ||
| Relay Output | 4-way DO | √ | ||
| Analog Output | DC 4-20mA throughout | √ (Analog Function) | ||
| Fault Record | 50 event records, documenting the type and time of motor failures | √ | ||
| Measurement shows | Measurement Parameters | Current, Voltage, Power, Power Factor | √ | |
| Zero-sequence current, electrical energy, frequency | √ | |||
| Setpoint value | Setpoint configuration | Various protection setpoint inquiries | √ | |
| Various protection setpoints | √ | |||
Technical Specifications
| Technical Specifications | Key Technical Specifications | |
| Working Power Supply | AC/DC 85~265V, Power Consumption 8VA | |
| Rated Working Voltage | AC 380V / 660V (non-standard, specify upon order), 50Hz / 60Hz | |
| Rated Operating Current | Utilize an external dedicated current transformer that matches the rated current. | |
| Relay Output Contact Rating | Resistive Load | AC220V、5A；DC24V、6A； |
| 感性负载 Inductive Load | AC220V、2A；DC24V、2A； | |
| Switched quantity input | Dry Node (Built-in DC15V) | |
| Communication | RS485 Modbus-RTU Protocol | |
| Environmental | Operating Temperature | -20ºC～+55ºC |
| Storage Temperature | -25ºC～+70ºC | |
| Relative Humidity | ≤95% no condensation, non-corrosive gases | |
| Altitude | ≤2000m | |
| Pollution Level | 2nd Grade | |
| Protection Grade | IP45 (mounted on cabinet panel) | |
| Installation Category | III Grade | |
Dimensions and wiring diagram
| Instrument appearance | Housing dimensions | Hole Size | |||
| 72 Square | A | B | C | D | E |
| 73 | 73 | 69.5 | 67 | 67 | |
Installation size diagram (in mm) Backside terminal diagram
| |||||
Intelligent low-voltage line protection devices are suitable for systems with rated voltages up to AC 660V (default 380V), rated currents up to AC 800A, and rated frequencies of 50/60Hz. They provide comprehensive intelligent protection for feed line terminals. They protect against faults such as short circuits, overcurrents, zero-sequence overcurrents, low voltage, and overvoltage during feed line operation. The protective device adopts a modular product structure, including the main unit (protection, measurement, and control function module), transformer modules, featuring complete electric quantity measurement functions. It also offers switch input monitoring, fault recording, analog signal transmission, and communication functions, allowing for easy connection to factory DCS systems for automated control. Control and protection for loads above 800A can be achieved through a 5A dedicated transformer.
Product Features
Auxiliary Power Supply: AC/DC 85~270V
Measurement Functions (Current, Voltage, Power, Energy, Zero Sequence/Leakage Current)
A comprehensive protection function featuring rapid, time-limited rapid, inverse-time overcurrent, time-limited overcurrent, unbalance, zero-sequence protection, overvoltage, undervoltage phase I, undervoltage phase II, and PT open-circuit protection, etc.
8-way DI passive dry node input; utilizes an internal DC15V power supply for signal and power.
4-way DO output for circuit breaker protection, remote control, and alarm.
Standard RS-485 communication interface with Modbus-RTU protocol ensures fast and reliable communication with the host computer.
Features a DC4-20mA analog output interface, directly connectable to DCS systems, enabling on-site equipment monitoring.
Equipped with a system clock and 50 event logging capabilities, the system clock records the current time (year, month, day, hour, minute, second, millisecond); the fault logging function records the time and cause of system malfunctions.
The display is equipped with a Chinese dot matrix LCD screen, offering a user-friendly interface.
Can replace various conventional components such as voltmeters, signal lights, thermal relays, and current transmitters, reducing the amount of cable connections inside the cabinet and on-site construction. It offers higher reliability and overall cost-effectiveness compared to traditional solutions.
With integrated multiple protection features, the low-voltage line protector can quickly respond to various fault conditions, cut off the faulty circuit, prevent the fault from spreading and expanding, ensuring the stable operation of the electrical system.
Feature Configuration
| Type and Function | Feature Configuration | |||
| Standard Features | Enhanced features | |||
| Protective Function | Instant decision | √ | ||
| Speed limit cutoff | √ | |||
| Inverse-time overcurrent | √ | |||
| Time-delayed overcurrent protection | √ | |||
| Unbalanced Protection | √ | |||
| Residual Current (Select one only) | Zero Sequence (Self-produced) | √ | ||
| Zero Sequence (Transformer Connection) | √ (Zero Sequence) | |||
| Leakage (Transformer Connection) | √ (Leakage) | |||
| Under-voltage, over-voltage | √ | |||
| PT Disconnection | √ | |||
| Anti-surge module | √ | |||
| Communication Features | RS485 Interface Communication Protocol: MODBUS-RTU | √ | ||
| Switched quantity input | 8-way DI | √ | ||
| Relay Output | 4-way DO | √ | ||
| Analog Output | DC 4-20mA throughout | √ (Analog Function) | ||
| Fault Record | 50 event records, documenting the type and time of motor failures | √ | ||
| Measurement shows | Measurement Parameters | Current, Voltage, Power, Power Factor | √ | |
| Zero-sequence current, electrical energy, frequency | √ | |||
| Setpoint value | Setpoint configuration | Various protection setpoint inquiries | √ | |
| Various protection setpoints | √ | |||
Technical Specifications
| Technical Specifications | Key Technical Specifications | |
| Working Power Supply | AC/DC 85~265V, Power Consumption 8VA | |
| Rated Working Voltage | AC 380V / 660V (non-standard, specify upon order), 50Hz / 60Hz | |
| Rated Operating Current | Utilize an external dedicated current transformer that matches the rated current. | |
| Relay Output Contact Rating | Resistive Load | AC220V、5A；DC24V、6A； |
| 感性负载 Inductive Load | AC220V、2A；DC24V、2A； | |
| Switched quantity input | Dry Node (Built-in DC15V) | |
| Communication | RS485 Modbus-RTU Protocol | |
| Environmental | Operating Temperature | -20ºC～+55ºC |
| Storage Temperature | -25ºC～+70ºC | |
| Relative Humidity | ≤95% no condensation, non-corrosive gases | |
| Altitude | ≤2000m | |
| Pollution Level | 2nd Grade | |
| Protection Grade | IP45 (mounted on cabinet panel) | |
| Installation Category | III Grade | |
Dimensions and wiring diagram
| Instrument appearance | Housing dimensions | Hole Size | |||
| 72 Square | A | B | C | D | E |
| 73 | 73 | 69.5 | 67 | 67 | |
Installation size diagram (in mm) Backside terminal diagram
| |||||
| 品牌： | Yongnuo Electrical |
| Brand： | Yongnuo Electrical |
| Region： | National |
| Model： | Customizable |
| 单价： | 电议 |
| 最小起订Quantity： | |
| 供货总Quantity： | |
| 有效期至： | 长期有效 |
| 最后更新： | 2025-04-29 13:22 |
