This MicroLogic 5.3 AZ 3-pole 3d electronic trip unit is an electronic trip unit used with ComPacT NSX 630 circuit breakers. This 630 A rated electronic trip unit is used in special 2/3 distribution systems at 16 Hz for railway applications. It has adjustable long-term protection against overloads. It also offers adjustable short-time delayed short-circuit protection and instantaneous short-circuit protection. MicroLogic 5.3 AZ indicates overloads with alarm LEDs. The green Ready LED flashes when the circuit breaker is ready to trip. MicroLogic 5.3 AZ is equipped with a display module that provides current measurements and allows fine adjustments. This product is part of our EcoStruxure Power architecture when combined with the PowerTag NSX and ComPacT NSX basic switch.