The ELR-4MD Type A DC Earth Leakage Relay is an advanced protection device designed to enhance the safety and reliability of electrical systems. Complying with IEC 60755 Type A standard, it continuously monitors both AC and pulsating DC leakage current via a DC hall effect current sensor (HCT). When the leakage current exceeds the preset threshold, the relay outputs an alarm signal, ensuring early detection of potential faults.
Equipped with adjustable pre-alarm and alarm response levels, the ELR-4MD ensures that alarm signals remain clearly indicated until received the reset signal, facilitating easy fault diagnosis and troubleshooting. With RS485 Modbus communication interface enables real-time remote monitoring and integration into SCADA systems. ELR-4MD is critical for preventing equipment damage, minimizing downtime, and safeguarding personnel against electrical hazards.
The ELR-4MD Type A DC Earth Leakage Relay is an advanced protection device designed to enhance the safety and reliability of electrical systems. Complying with IEC 60755 Type A standard, it continuously monitors both AC and pulsating DC leakage current via a DC hall effect current sensor (HCT). When the leakage current exceeds the preset threshold, the relay outputs an alarm signal, ensuring early detection of potential faults.
Equipped with adjustable pre-alarm and alarm response levels, the ELR-4MD ensures that alarm signals remain clearly indicated until received the reset signal, facilitating easy fault diagnosis and troubleshooting. With RS485 Modbus communication interface enables real-time remote monitoring and integration into SCADA systems. ELR-4MD is critical for preventing equipment damage, minimizing downtime, and safeguarding personnel against electrical hazards.
| Working power supply | |
| Power supply | 85-265VAC/DC, optional 48VDC |
| Power consumption | ≤4VA |
| Frequency | 50/60Hz, Accuracy ±0.01Hz |
| Hall CT | |
| Power supply | ±15Vdc |
| Rated current range | 0-250A, hole size: 60mm |
| Rated output | ±4V |
| 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) |
| I/O capacity | |
| Digital input | 2* DI for reset/ test, NC
dry contact, Ri<500Ω turns on, Ri>100kΩ turns off |
| Digital output | 2DO; 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 |
Select our DC earth leakage relay for Residual Current Monitoring in your application. There are some typical applications in the following:
Dimension of ELR-4MD residual current protection relay: 78*90*60 mm W*H*D
