The 2866077 is a voltage monitoring relay designed for phase sequence, phase failure, and asymmetry detection in electrical systems. It features electronic monitoring capabilities within the EMD series, suitable for monitoring single-phase or three-phase networks. The relay has a DPDT (double pole double throw) contact configuration with a current rating of up to 5A and can handle switching voltages up to 400VAC. It is typically mounted on a DIN rail and provides reliable protection by detecting voltage irregularities such as phase loss, phase sequence errors, and voltage asymmetry.

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