Power Quality Relay-PQ1

Power Quality Relay


The PQ1 Power Quality Sensor detects power quality problems on standard AC power mains. It is a single-phase monitor that can also be used phase-tophase or phase-to-neutral on three-phase power systems. 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. You can select one out of the 16 pre-programmed industry-standard depth/duration response curves, covering voltage sags, swells, high-frequency impulses, and power interruptions.

The PQ1 is useful in 

  • Semiconductor manufacturing tools
  • Medical laboratory equipment
  • SCADA systems, PLC systems
  • Elevator controls
  • Ultra-low-cost substation power quality monitoring
  • Machine tools, HVAC controls, ASD’s
  • Servers and data centers, telecom centers
  • Any place where sensitive device/machine/equipment to be connected to mains supply


  • Very low cost
  • Detects sags/dips, swells, interruptions, impulses
  • Simple to install - AC in, relay contacts out
  • Captures impulses as short as 500 nanoseconds
  • 0,5% typical accuracy
  • Automatically adjusts to 50Hz, 60Hz, or 400Hz
  • Direct connection to 100 Vrms ~ 240 Vrms
  • Can be used at 277 Vrms ~ 600 Vrms with external
  • step-down transformer
  • Built-in international power quality standards
  • No software required, no computer required