Siemens 3UA59 Overload Relay

Siemens 3UA59 overload relay is a phase‑failure sensitive, thermally delayed motor protection device in the 3UA family, designed to protect small motors when paired with Siemens World Series contactors. Siemens documentation verifies its phase‑failure sensitivity and compliance with DIN VDE 0660 Part 102 and IEC 60947‑4, with Order No. 3ZX1012-0UA51-1AA1; the variant 3UA59-00-0G lists a current setting range of 0.4–0.63 A. It is commonly used with Siemens World Series contactors and motor starters (model types 3TF30–3TF46) and is available as an assembled unit with wiring connectors and terminals, often featuring a manual reset button for straightforward installation and reset after tripping.