Siemens 3RN2023-1DW30 Thermistor Motor Protection Relay

Siemens 3RN2023-1DW30 thermistor motor protection relay monitors two independent PTC sensor circuits to warn and switch off a motor if winding temperature rises. This 22.5 mm‑wide SIRIUS 3RN2 device comes in a screw‑terminal enclosure and provides one normally open (NO) contact plus one changeover (CO) contact, powered from 24 to 240 V AC/DC with options for manual, automatic, or remote reset. A three‑LED status display (Ready, Warning, Tripped) along with safe galvanic isolation, wire‑break monitoring, short‑circuit monitoring, and non‑volatile memory for settings deliver clear protection and reliability. Its compact 100 mm high by 22.5 mm wide by 90 mm deep enclosure with ATEX approval supports motor protection in potentially explosive atmospheres.