The PQ1 Power Quality Relay detects power quality problems on standard AC power mains. It is a single-phase monitor that can also be used in phase-to phase, phase-to-neutral and three-phase power
applications. The PQ1 costs less than one-tenth as much as traditional power quality monitors. It quickly pays for itself by reducing service calls on automatic manufacturing systems,
semiconductor tools, medical equipment, elevator controls, and other complex systems.