product function ● undervoltage detection No ● overvoltage detection No ● phase sequence recognition Yes ● phase failure detection Yes; available but limited, detection is problematic with high levels of regenerative power recovery ● asymmetry detection Yes; not adjustable, indirectly by monitoring the voltage limit values ● overvoltage detection 3 phase No ● undervoltage detection 3 phases No ● voltage window recognition 3 phase No ● adjustable open/closed-circuit current principle No ● auto-RESET Yes suitability for use safety-related circuits No