The A9E21180 is a phase monitoring device designed to oversee the presence and correctness of voltage across the three phases of a three-phase power supply. It detects phase loss or inversion, ensuring proper phase sequence and voltage conditions. The device functions as a control relay with a rated operational current of 8 A at 250 V AC (cos Phi = 1) and features local signaling indicators, including red and green LEDs to report faults and power status. It operates within a voltage measurement range of approximately 0.15VAC to 10VAC and is suitable for integrating into systems requiring reliable phase monitoring and control.

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