Based on this product's specifications, here are some alternatives and similar models
FF CKF-BT-TRMS Phase Sequence and Phase Loss Monitoring Relay
Summary description:
The FF CKF-BT-TRMS is a professional phase sequence and phase loss monitoring relay designed to protect three-phase electrical equipment. It features TRMS measurement technology for accurate voltage monitoring, ensuring reliable operation by detecting incorrect phase sequence or loss. Ideal for industrial and commercial electrical installations requiring precise phase protection and system stability.