ATC Diversified Electronics SLA Series 3-phase monitoring relays

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The SLA Series 3-phase monitoring relay from ATC Diversified Electronics offers cost-effective protection from phase loss, undervoltage, and phase reversal conditions that can contribute to premature equipment failure and downtime within motor control centres, critical motors and pumps.

The series can effectively monitor current ranges up to 480 VAC with ABC phase sequence. Models are available in a choice of several enclosure styles, as well as with selection of fixed, lock shaft, or screwdriver adjustment. Series models are available with either SPDT or DPDR output. An onboard LED illuminates when all conditions are at normal, for a quick and clear visual reference of system conditions. Most units also feature automatic reset.

UL-listed versions are available upon request.

When a phase is lost while the motor is running, a condition known as regeneration occurs. Here, a voltage is induced into the open phase that is nearly equal in magnitude to the normal phase-to-phase voltage. However, with the exception of lightly loaded motors, enough change is detected by the series to provide required protection when properly adjusted.

The series is suitable for a variety of applications, including water and wastewater pumps and motors, sewage plant booster control stations, grinders, irrigation equipment, oil and gas machinery, machine tooling, conveyors, HVAC/R, elevators and escalators, processing equipment, construction and agricultural machinery and wind power turbine monitoring.