Siemens 3UA59 00-0K Overload Relay

Siemens 3UA59 00-0K overload relay is a thermally delayed protection device designed to mount on a compatible contactor to guard AC motors in starter circuits. It provides a setting range of 0.8 to 1.25 A with 1 normally open and 1 normally closed contact (1NO+1NC) for signaling and control. Built to DIN VDE 0660 and IEC 60947-4 standards, it offers a rated insulation voltage of 690 V AC and is suitable for circuits up to 600 V with a short-circuit current rating of up to 5 kA rms. The unit is rated for ambient temperatures from -25 °C to +55 °C and carries IP20 protection (per IEC 60529). Mounting is flexible: snap-on on a 35 mm DIN rail to EN 50 022 or bolting to a flat surface. The 00 suffix denotes a specific tripping characteristic in the 3UA59 family, with the 125% trip behavior described in the catalog lineage. Typical applications include motor protection for small to medium AC motors in machine tools, conveyors, pumps, and fans, where precise overload control and reliable status signaling are essential components of a motor starter assembly.