The TPM Neutral-Free Phase Monitoring Relay, developed by Borna Electronics, is an ideal solution for protecting three-phase electrical systems in installations where a neutral conductor is not available. The relay continuously monitors critical network parameters and provides reliable protection against phase loss, phase sequence reversal, overvoltage, undervoltage, and voltage imbalance conditions.
Equipped with six LED indicators for operating status and fault diagnosis, the TPM relay enables quick identification of abnormal conditions and improves system reliability in industrial and commercial applications.
Features
- Detection of phase sequence reversal
- Detection of phase loss
- Detection of three-phase voltage imbalance
- Undervoltage detection
- Overvoltage detection
- Selectable reset/reconnection time after fault clearance
- Available with 100 VAC input version for PT (Potential Transformer) outputs
- Adjustable voltage imbalance threshold
- Six LED indicators for power supply, output status, phase sequence fault, voltage imbalance, undervoltage, and overvoltage conditions
Technical Specifications
| Parameter | Specification |
| Supply Voltage | 380 VAC ±15% |
| Network Voltage | 380 VAC, 3-wire system |
| Network Frequency | 50 Hz ±5% |
| Internal Power Consumption | 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 and Flush Mounted according to IEC 60715 |
| Insulation Class | Class II |
| Output Relay | One C/O (SPDT) contact, 6 A |
Applications
- Three-phase motor protection
- Industrial control panels without neutral conductor
- Pump and compressor systems
- Industrial machinery
- HVAC installations
- Power distribution systems
The TPM Neutral-Free Phase Monitoring Relay provides comprehensive protection for three-phase systems where a neutral connection is unavailable, helping prevent equipment damage, motor failures, and costly downtime