This MicroLogic 7.3 E AL (Energy) 4d electronic trip unit is a 4-pole 4d trip unit used on ComPacT NSX 400/630 circuit breakers. This 400 A rated electronic trip unit is the best choice for all standard and special applications. It features customizable long-term overload protection. It also offers customizable short-time delayed short-circuit protection and instantaneous short-circuit protection. MicroLogic 7.3 E AL offers a residual current alarm without tripping, available on the terminal block. MicroLogic 7.3 E AL indicates overloads with alarm LEDs. The green Ready LED flashes when the circuit breaker is ready to trip. MicroLogic 7.3 E AL is equipped with a display module that provides 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 switches.