Phase Monitoring Relays

Adjustable phase monitoring relays provide configurable protection for 3-phase electrical systems through front-mounted adjustment controls. These models combine phase monitoring, voltage monitoring, and motor protection functions with adjustable thresholds and timing settings that allow protection parameters to be matched to specific application requirements. Integrated PTC models add motor winding temperature protection while maintaining the same compact 18 mm DIN rail footprint.

• Operating voltage ranges from 75-250 VAC through 150-500 VAC support a broad range of 3-phase power systems
• Adjustable asymmetry thresholds from ±5% to ±30% allow protection sensitivity to be matched to system conditions
• Adjustable overvoltage and undervoltage protection helps safeguard equipment from abnormal supply conditions
• Adjustable fault delays from 0.1 to 10 seconds help reduce nuisance trips caused by transient disturbances
• Phase loss, phase sequence, phase unbalance, and neutral-loss monitoring provide comprehensive power-quality protection on applicable models
• Integrated PTC inputs on select models combine motor winding temperature monitoring with electrical fault protection
• True RMS measurement technology improves monitoring accuracy under non-linear load conditions
• 10A SPDT relay outputs support direct integration into machine control, alarm, and protective shutdown circuits