AutomationDirect: Klemsan Phase Monitoring Relays
September 15, 2026
Klemsan phase monitoring relays are compact, DIN rail-mounted devices that continuously monitor 3-phase electrical systems to protect motors and equipment from damaging power quality faults.
Available in fixed and adjustable versions, these relays detect phase loss, phase reversal, phase unbalance, overvoltage, undervoltage, neutral loss, and PTC thermistor faults, automatically disconnecting equipment before damage occurs. Models support input voltages from 75 to 500 VAC and feature a 10A SPDT relay output, LED status indication, and True RMS measurement technology for reliable operation with VFDs, generators, and other non-linear loads.
The adjustable models offer configurable voltage thresholds, asymmetry settings, and time delays through convenient front-panel adjustments, eliminating the need for software or mobile apps. Select models include integrated PTC thermistor protection, reducing component count and panel space requirements by eliminating a separate motor temperature relay.
All Klemsan phase monitoring relays feature an ultra-slim 18mm housing, UL and CE approvals, and are backed by a 5-year warranty for reliable protection in industrial automation, wastewater, food and beverage, packaging, and power applications.
Klemsan phase monitoring relays start at $24.00 (FP1Y-SF-230).
