Feature
- 2*SPST relay outputs;
- Hall current sensor measurement;
- Remote test/rest connections;
- Standard 35mm din rail mounting;
- RS485 Modbus communication;
- Adjustable trip levels and time delay.
Technology of Electrical Automatic
ELR-4MD DC Earth Leakage Relay
ELR-4MD DC Earth Leakage Relay
The ELR-4MD DC Earth Leakage Relay is an advanced protection device designed to enhance the safety and reliability of electrical systems. With a hall effect current sensor (HCT), it continuously monitors the residual current in the busbars or branches of the DC system. When the residual current exceeds the preset threshold, the relay promptly outputs an alarm signal, ensuring early detection of potential faults.
Equipped with an alarm function, the ELR-4MD DC digital earth leakage relay ensures that alarm signals remain clearly indicated until received the reset signal, facilitating easy fault diagnosis and troubleshooting. ELR-4MD DC earth leakage protection relay is critical for preventing equipment damage, minimizing downtime, and safeguarding personnel against electrical hazards.
The ELR-4MD DC Earth Leakage Relay is an advanced protection device designed to enhance the safety and reliability of electrical systems. With a hall effect current sensor (HCT), it continuously monitors the residual current in the busbars or branches of the DC system. When the residual current exceeds the preset threshold, the relay promptly outputs an alarm signal, ensuring early detection of potential faults.
Equipped with an alarm function, the ELR-4MD DC digital earth leakage relay ensures that alarm signals remain clearly indicated until received the reset signal, facilitating easy fault diagnosis and troubleshooting. ELR-4MD DC earth leakage protection relay is critical for preventing equipment damage, minimizing downtime, and safeguarding personnel against electrical hazards.
Specification
| Working power supply | |
| Power supply | 85-265VAC/DC, optional 48VDC |
| Power consumption | ≤4VA |
| Frequency | 50/60Hz, Accuracy ±0.01Hz |
| Hall CT (External) | |
| Power supply | +/-15Vdc |
| Alarm threshold | 5mA-3A, adjustable; |
| Response sensitivity | 1mA |
| Frequency range | 50-400Hz |
| Trip time delay | 50ms-10sec, adjustable |
| Operating performance | Type A (acc.to lEC 62020) |
| Rated current range | 0-250A |
| Hole size | 60mm |
| I/O capacity | |
| Digital input | 2* DI for reset/ test, NC
dry contact, Ri<500Ω turns on, Ri>100kΩ turns off |
| Digital output | 1* relay NO for safety; 1* relay NC for alarm
Load capacity: 5A@250VAC |
| Others | |
| Communication | RS-485 MODBUS-RTU |
| Display | LCD with backlit |
| Withstand voltage | 2.5KV 1min |
| Insulation | Input, output, power supply to shell >5MΩ |
| Storage environment | -40~70°C |
| Working environment | -25~55°C Altitude ≤2500m,
0~95%RH, non-condensing, non-corrosive gas |
Application
Select our DC earth leakage relay for Residual Current Monitoring in your application. There are some typical applications in the following:
- Smart grid system;
- Medium and low voltage systems;
- Commercial and residential buildings;
- Utilities and power distribution systems;
- Motor control panels and switchboards;
- DC system leakage current measurement;
- Industrial control system (PLC, SCADA, DCS).
Wiring method
Dimension
Dimension of ELR-4MD residual current protection relay: 78*90*60 mm W*H*D
