The ELR-4MA Type A Earth Leakage Relay is a compact protection device designed to improve the safety and stability of electrical systems. Complying with IEC 60755 Type A standard, it detects both AC and pulsating DC leakage currents via a leakage current transformer (ZCT). Once the leakage current exceeds the preset limit, the relay promptly issues an alarm, ensuring rapid fault indication.
Featuring adjustable pre-alarm and alarm response thresholds, the ELR-4MA ensures that alarm signals remain active until manually reset, supporting efficient fault identification and resolution. With RS485 Modbus communication allows seamless integration with remote monitoring and control systems. The ELR-4MA is an ideal solution for protecting equipment, reducing operational interruptions, and ensuring personnel safety.
The ELR-4MA Type A Earth Leakage Relay is a compact protection device designed to improve the safety and stability of electrical systems. Complying with IEC 60755 Type A standard, it detects both AC and pulsating DC leakage currents via a leakage current transformer (ZCT). Once the leakage current exceeds the preset limit, the relay promptly issues an alarm, ensuring rapid fault indication.
Featuring adjustable pre-alarm and alarm response thresholds, the ELR-4MA ensures that alarm signals remain active until manually reset, supporting efficient fault identification and resolution. With RS485 Modbus communication allows seamless integration with remote monitoring and control systems. The ELR-4MA is an ideal solution for protecting equipment, reducing operational interruptions, and ensuring personnel safety.
Relay Parameters
| Working power supply | |
| Power supply | 85-265VAC/DC, optional 48VDC |
| Power consumption | ≤4VA |
| Frequency | 50/60Hz, Accuracy ±0.01Hz |
| 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 |
Leakage CT Parameters
| Electrical parameters | |
| Alarm threshold | 5mA-3A, adjustable; |
| Response sensitivity | 1mA |
| Trip time delay | 50ms-10sec, adjustable |
| Operating performance | Type A (acc.to lEC 62020) |
| Operating frequency | 50-400HZ |
| Rated input | 0-1A |
| Measurement range | 10%IN-130%IN |
| Rated output | 0-1V or 0-0.5mA |
| CT ratio error | ≤±0.1% |
| Phase angle | ≤10° |
| Dielectric strength | AC2.5KV 1mA/60S |
| Insulation resistance | DC500V/1000MΩ |
| Other parameters | |
| Housing material | ABS flame retardant grade 94V-0 |
| Frame | PBT |
| Core | Permalloy or nanocrystalline |
| Internal structure | Environmentally friendly epoxy resin |
| Fixture method | Screw fastening |
| Ambient humidity | ≤85% humidity |
| Wiring method | Terminal type/shielded stranded wire 1.5M |
Dimension: 78*90*60 mm W*H*D
