SIRIUS Analog Monitoring Relay – Level Monitoring Relay (Fill Level / Resistance Monitoring), 24…240 V AC/DC, 1 C/O

Siemens 3UG4501-2AW30 is a SIRIUS 3UG45 level monitoring relay designed for conductive liquid level control using electrode/resistance monitoring (typically for tank fill/empty applications). It operates on a wide 24…240 V AC/DC supply, monitors conductive level via resistance range 2…200 kΩ, and provides one changeover (1 C/O) relay output for switching control (e.g., pump/valve). The compact 22.5 mm DIN-rail module is built for control-panel use and supports stable operation across -25…+60 °C, making it a practical choice for industrial water/process level monitoring where simple, reliable relay-based control is needed.