ELR-4MB is a Type B Earth Leakage Relay for TN and TT systems, compliant with IEC 60755:2017. It provides reliable detection of AC, pulsating DC, and smooth DC residual currents across a 0–20 kHz frequency range, it is ideal for industrial power distribution, renewable energy, and EV charging applications.
With independently adjustable alarm and trip thresholds, the ELR-4MB delivers dependable two-stage protection against electric shock, fire, and equipment damage. Integrated LCD indication, relay outputs, RS485 Modbus RTU communication, 35 mm DIN rail installation, and a wide-range power supply ensure seamless system integration and reliable operation in demanding industrial environments.
ELR-4MB is a Type B Earth Leakage Relay for TN and TT systems, compliant with IEC 60755:2017. It provides reliable detection of AC, pulsating DC, and smooth DC residual currents across a 0–20 kHz frequency range, it is ideal for industrial power distribution, renewable energy, and EV charging applications.
With independently adjustable alarm and trip thresholds, the ELR-4MB delivers dependable two-stage protection against electric shock, fire, and equipment damage. Integrated LCD indication, relay outputs, RS485 Modbus RTU communication, 35 mm DIN rail installation, and a wide-range power supply ensure seamless system integration and reliable operation in demanding industrial environments.
Relay Parameters
| Working power | |
| Power supply | 85-265Vac/dc |
| Power consumption | 3w |
| Frequency | 45-65Hz |
| Leakage current measurement | |
| Measurement type | Type B according to IEC 60755 |
| Measurement frequency | 0-20KHz |
| Measurement range | 5 mA-10A |
| Alarm and trip thresholds | 5 mA …1A adjustable, Step length: 1mA |
| Digital input/ output | |
| DI (Test and Reset) | 2*DI, active dry contact, built-in 12 VDC pull-up voltage
0.25 mA @ short circuit |
| DO (Alarm and Trip) | 2*SPDT, normally open, passive dry contact
Load capacity: 10 A @250Vac; 5 A @ 30Vdc |
| Other parameters | |
| Communication | RS485/Modbus RTU |
| Mounting method | Standard 35 mm DIN rail mounting |
| Dimensions | (Width × Height × Depth): 72 × 110 × 66 mm |
| Storage temperature | -55°C to 90°C; ≤90% RH (non-condensing, non-corrosive); altitude: ≤3500 m |
| Operating temperature | -40°C to 75°C; ≤90% RH (non-condensing, non-corrosive); altitude: ≤3500 m |
Leakage CT Parameters:
| Model | Hole Size | Rated Current | Max Operating Current | Operating voltage | CT ratio |
| ELR-CT35 | ⌀ 35mm | 400A | 600A | ±15Vdc | 2000:1 |
| ELR-CT80 | ⌀ 80mm | ||||
| ELR-CT120 | ⌀ 120mm |
Relay Dimension
Dimension of ELR-CT
