The BFR Battery Earth Fault Relay, developed by Borna Electronics, is specifically designed for earth leakage fault detection in DC power systems. Its primary application is the detection of leakage currents between battery poles and earth, enabling early identification of insulation faults and preventing system failures in critical DC installations.
The relay independently monitors both positive and negative battery poles. The B+ indicator signals leakage current between the positive pole and earth, while the B− indicator signals leakage current between the negative pole and earth. With milliamperes-level sensitivity and no requirement for additional external devices, the BFR relay provides a simple and reliable solution for DC earth fault monitoring.
Features
- Detection of positive battery pole-to-earth leakage faults
- Detection of negative battery pole-to-earth leakage faults
- Suitable for installation in all DC distribution panels
- No additional external equipment required
- Milliamperes-level leakage current detection sensitivity
- Wide DC voltage operating range
- Two independent output relays for positive and negative earth fault indications
- Two LED indicators: B+ (Positive Pole Earth Fault) and B− (Negative Pole Earth Fault)
Technical Specifications
| Parameter | Specification |
| Supply Voltage | 24 VDC, 48 VDC, or 110 VDC (other voltages available upon request) |
| 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
- Battery charger systems
- Industrial DC power systems
- Substation DC panels
- Telecommunication power systems
- Industrial UPS systems
- Monitoring insulation faults in DC distribution networks
The BFR Battery Earth Fault Relay provides reliable monitoring of DC insulation faults, helping operators detect earth leakage conditions at an early stage, improve system safety, and prevent unexpected outages in critical DC power applications.