Protection against earth leakage faults is an essential requirement in modern electrical distribution systems. The EFR Earth Fault Relay, used together with Borna Electronics Core Balance Current Transformer (CBCT), is designed to provide reliable protection against earth leakage currents. The relay is available in two adjustable current ranges, 0.3–6 A and 1–20 A, and incorporates advanced features such as earth leakage detection, core balance CT open-circuit supervision, output logic selection, and built-in test functions.
The EFR relay can be configured for both contactor-based protection systems and shunt-trip circuit breaker applications, making it suitable for a wide range of industrial and commercial installations
Features
- Earth leakage current detection
- Third-harmonic rejection for improved measurement accuracy
- Core Balance Current Transformer (CBCT) detection method
- Accuracy Class 1.5
- Detection of leakage currents in underground cables, motor windings, and electrical panels
- Adjustable leakage current ranges: 0.3–6 A and 1–20 A
- Adjustable relay trip delay from 0.5 to 10 seconds
- Output logic selection for contactor or shunt-trip circuit breaker applications
- Three LED indicators for power supply status, CBCT open-circuit condition, and fault status
- RESET and TEST push buttons
Technical Specifications
| Parameter | Specification |
| Supply Voltage | 220 VAC ±20% |
| Network Frequency | 50 Hz ±5% |
| Internal Power Consumption | Approx. 3 W |
| Protection Degree | IP20 according to IEC 60529 |
| Operating Temperature | -20°C to +60°C |
| Relative Humidity | 15% to 85% |
| Mounting Method | DIN Rail according to IEC 60715 |
| Insulation Class | Class II |
| Output Relay | One C/O (SPDT) contact, 6 A |
Applications
- Electrical distribution panels
- Industrial motor protection systems
- Underground cable networks
- Industrial and commercial facilities
- Power distribution systems
- Protection against earth leakage and insulation faults
The EFR Earth Fault Relay provides dependable protection against earth leakage currents, helping prevent equipment damage, electrical hazards, and unexpected downtime while improving overall system safety and reliability.