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Lh 300b Advanced Electric Arc Protection Device with Ultra-Fast Response Time. Fiber Optic Transmission: Arc flash signals transmitted entirely via fiber optics for safety. High Monitoring Capacity: Supports up to 148 arc flash monitoring points and 6 current channels. Adjustable Threshold: Arc flash threshold can be steplessly adjusted via a potentiometer. Modular Design: Modular plug-in structure allows for easy maintenance and debugging. Comprehensive Protection: Protects against arc flash faults, overcurrent faults, and switch positioning. ODM Customization: Full customization, minor customization, and design-based options available.