The SPR Super Phase Monitoring Relay, developed by Borna Electronics, provides advanced protection for three-phase electrical systems and motors. In addition to protecting equipment against phase loss, neutral loss, phase sequence reversal, overvoltage, undervoltage, and voltage imbalance, the relay is capable of detecting contactor contact failure (incomplete contactor switching), a critical fault that can lead to motor damage and overheating.

By monitoring the three-phase voltage at the contactor output, the SPR relay offers enhanced motor protection and is particularly suitable for applications where reliable motor operation is essential.

Features

• Protection against phase loss
• Protection against contactor contact failure
• Protection against undervoltage conditions
• Protection against phase sequence reversal
• Detection of phase loss on the medium-voltage supply side
• Adjustable voltage imbalance protection from 5% to 20%
• Fixed fault trip delay of 0.5 seconds
• Adjustable power-on delay from 0.5 to 40 seconds
• Four LED indicators for output status, phase sequence fault, undervoltage condition, and voltage imbalance or phase loss

Technical Specifications

Applications

• Three-phase motor protection
• Industrial control panels
• Pump and compressor systems
• HVAC installations
• Industrial machinery
• Applications requiring contactor supervision and advanced motor protection

The SPR Super Phase Monitoring Relay enhances motor and equipment reliability by combining conventional phase monitoring functions with contactor supervision, reducing the risk of motor burnout, equipment damage, and unexpected downtime.