The DUB02CT23 is a single-phase true RMS monitoring relay designed for over/under voltage protection, featuring one SPDT relay output with a measuring range of 19.2 to 275V AC/DC. It operates with a power supply of 24/115/230VAC and comes in a compact 22.5x83.5x99.5mm housing suitable for DIN rail mounting, rated at IP20 protection level.