The Siemens 3RU1146-4JB1 overload relay delivers reliable motor protection for demanding industrial control applications. Engineered for seamless integration in control panels and motor starters, it protects three-phase motors against thermal overloads in the 45 to 63 A range to help reduce downtime and extend asset life.

With an adjustable current setting from 45 to 63 A, the 3RU1146-4JB1 enables precise coordination with upstream protection and contactors. Its thermal operating principle provides consistent tripping under sustained overload conditions, while the durable construction supports dependable performance in continuous-duty environments across manufacturing, HVAC, pumping, and materials handling.

Chosen by panel builders and maintenance teams for its straightforward setup and robust design, this overload relay supports safe, standards-aligned motor protection in cost-efficient installations and comes with a 1-year warranty for added peace of mind.

• Brand: Siemens
• Series: 3RU11
• Model: 3RU1146-4JB1
• Current setting range: 45 to 63 A
• Device type: Thermal overload relay