The Siemens 3UG5532-2AW30 is an analog monitoring relay in the Voltage Monitoring family, designed to detect both overshoot and undershoot conditions on a monitored voltage from 10 to 690 V AC/DC. It operates from its own supply voltage of 24 to 240 V AC/DC at 50/60 Hz and switches a single changeover contact via spring-loaded terminals — no screw tightening needed, which speeds panel wiring.
RoHS compliance applies from June 1, 2023, and the part contains lead (CAS 7439-92-1) above 0.1% w/w, which must be declared under REACH Article 33.
The 10–690 V AC/DC monitoring range covers standard low-voltage supplies (24 V, 48 V, 120 V, 230 V, 400 V) without needing a separate voltage divider or external PT — one relay handles the full span. A single changeover contact (SPDT) is enough for a simple alarm or trip signal; if you need two independent outputs or a latching function, you would step up to a multi-function relay in the same family.