Siemens 3UA5400-2Q Overload Relay 25-36A Industrial Grade

Siemens 3UA5400-2Q Overload Relay is a three-pole, thermal-delay overload protection device designed to mount with Siemens World Series motor starters, providing primary protection for three-phase motors up to 36 A. It covers a current range of 25–36 A and is compatible with Siemens World Series contactors such as the 3TF44 and 3TB44 families, delivering reliable trip behavior in standard industrial motor circuits up to 690 V AC. The 3UA54-00-2Q variant includes a manual reset and an integrated 1NO/1NC auxiliary contact used for signaling the relay’s status in the control circuit, enabling simple integration into existing protection schemes. This compact relay is intended to be mounted directly on the associated contactor, offering plug-on installation and straightforward wiring terminals for maintenance efficiency. When selecting replacement or upgrade parts, ensure exact model matching to maintain compatibility with the existing World Series assembly and control wiring, so protection characteristics align with the motor’s full load current and the panel’s electrical specifications.