This document is a user manual for the s phase failure protection thermal overload relay 3UA50, 3UA52. It introduces the installation, wiring, and debugging methods of the product, as well as its features and characteristics.
The 3UA50 and 3UA52 overload relays protect three‑phase motors against overload and phase‑failure conditions. They are intended for use in industrial electrical control systems and comply with IEC 60947‑4‑1 and VDE standards.
The manual covers mounting options (individual or on contactors), wiring diagrams, commissioning steps, adjustment of the current setting, tripping characteristics, and environmental limits. Safety warnings and protection class (IP20) are also included.
| Rated insulation voltage | 690 V |
|---|---|
| Rated operational current (3UA50) | 0.1~14.5 A |
| Rated operational current (3UA52) | 0.1~25 A |
| Permissible ambient temperature | -25 °C to +55 °C |
| Protection class | IP20 |
| Mounting rail | 35 mm standard sectional rail (DIN EN 50022) |
Turn the reset button counter‑clockwise from the H (manual) position to the A (automatic) position.