Siemens 3UA5800-2E25-40A Overload Relay

Siemens 3UA5800-2E25-40A Overload Relay is an adjustable bi-metal overload protection device designed to mount with Siemens contactors in the 3TF46, 3TF47, 3TF48 (and 3TB48) families to guard motors against overload. It offers a current setting range of 25 to 40 A, enabling precise tailoring to the motor’s full-load current and protection needs within typical industrial applications. This specific 3UA5800-2E25-40A variant is intended for use in motor starter assemblies where a dedicated overload relay accompanies the contactor, helping to interrupt current automatically when overheating conditions exceed the setpoint while leaving the control circuit unaffected. Compatible with NEMA size 2 and size 3 configurations, it integrates into standard control panels and starter rows that use Siemens 3TF/3TB contactors, providing a compact, plug-in protection option without additional wiring complexity. Suitable for diverse the motor protection scenarios in manufacturing, processing, and HVAC equipment, this relay is part of Siemens’ longstanding family of overload relays designed to deliver reliable, field-adjustable protection aligned with Siemens contactors and control systems.