This MicroLogic 5.2 E (Energy) 4-pole 4d electronic trip unit is an electronic trip unit used with ComPacT NSX 250 circuit breakers. This 250A rated electronic trip unit is the best choice for all standard and special applications. It has customizable long-term overload protection. It also offers customizable short-time delayed short-circuit protection and instantaneous short-circuit protection. MicroLogic 5.2 E indicates overloads with alarm LEDs. The green Ready LED flashes when the circuit breaker is ready to trip. MicroLogic 5.2 E is equipped with a display module that enables energy measurements and allows fine adjustment. This product is part of our EcoStruxure Power architecture when combined with the PowerTag NSX and ComPacT NSX basic switch.