This Part applies to supplemental fuses rated 60 A or less intended only for supplementary overcurrent protection where branch circuit or equivalent applications are not involved. DC ratings are optional.
This bulletin announces the availability of the outline Subject 2564, Outline of Investigation for Low-Voltage Surge Withstand Telecommunications Overcurrent Protector Components, Subject 2566, Outline of Investigation for PART 2: Low-Voltage Surge Withstand Telecommunications Fuses, Subject 2567, Outline of Investigation for PART 3: Low-Voltage Surge Withstand Telecommunications Polymer Positive Temperature Coefficient Thermistor (PPTC), Subject 2569, Outline of Investigation for PART 5: Low-Voltage Surge Withstand Telecommunications Line Feed Resistor (LFR), Subject 2570, Outline of Investigation for PART 6: Low-Voltage Surge Withstand Telecommunications Electronic Current Limiters (ECL).
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