Siemens ETU745 Electronic Trip Unit For 2000A Frame

Siemens ETU745 Electronic Trip Unit for a 2000 A WL frame cubicle bus (WLL2A320) provides the electronic protection brain for Siemens WL circuit breakers installed in 2000 A cabinets, enabling precise coordination and fast fault isolation. The unit implements the core protective functions Long-Time (L), Short-Time (S), Instantaneous (I) and Ground-Fault (G); it can be configured with selectable Neutral protection and supports a range of advanced features including remote parameterization of alarm and basic functions, parameterization via rotary switches (10 steps), and communications-based setup (Modbus RTU/TCP, PROFIBUS DP, PROFINET IO). Depending on configuration, ETU745 can deliver metering functionality (Metering Function and Metering Function Plus) and present measured values on an alphanumeric or graphical display. Optional capabilities include Dynamic Arc-Flash Sentry (DAS) and Extended Instantaneous Protection (EIP), expanding protection during arc events and providing enhanced fault detection. The ETU745 is designed for Siemens WL cubicle bus systems, such as the WLL2A320 2000 A frame, and it integrates with the WL family to coordinate protection, control signaling, and alarms within the switchgear cabinet.