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SCL Phase Monitoring & Phase Failure Relays from Switchtec deliver reliable, compact protection for industrial and commercial power systems. Engineered for use in single- and three-phase applications, this DIN-rail range continuously monitors supply integrity — detecting phase loss, incorrect phase sequence and voltage irregularities before they can damage valuable equipment. With clear LED fault indication, easy installation and robust construction, these relays help maximise uptime, safeguard motors and control systems, and ensure smooth, efficient operation in demanding environments.

  • Phase under & over voltage monitoring relay
  • Selectable voltages
  • Time range 0.1 second to 10 seconds
  • 17.5mm width
  • DIN rail mountable
  • Power and Output LED
  • Single pole 10 Amp contact rating
  • UKCA & CE Approved
  • DPD Next Day service is based on business days, our cutoff for sending orders out is 14:00 Monday to Friday.
  • Orders received after this time will be despatched on the next working day.
  • If your delivery is of an urgent nature, please contact our Sales Team on 0121 502 5133 to confirm stock availability. As with all suppliers, we occasionally run out of stock of an item.
  • If any stock issues arise email notifications are sent out to confirm any delays to your order
  • Prices quoted are based on orders being placed on our website. If you require further information or assistance please call our Sales Team on 0121 502 5133.
  • If you include your email address and mobile number when you're placing an order you will get interactive updates from DPD



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