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Understanding Time Current Curves - Maverick Technologies

WHITE PAPER Understanding time Current Curves . Understanding time Current Curves David Paul , Engineering Design Manager, Maverick Technologies A time Current curve (TCC) plots the The orange curve is the transformer damage curve. The green Curves are the cable damage Curves . Each one interrupting time of an overcurrent of these items will be explained. The system represented device based on a given Current level. by this curve is well coordinated and adequately protected These Curves are provided by the from damage. It also has minimal Arc Flash hazard category ratings due to low instantaneous circuit breaker trip values. manufacturers of electrical overcurrent interrupting devices such as fuses and The One Line Diagram and TCC curve show a typical hypothetical circuit breakers.

The purpose of long time settings is to allow a time-based delay to elapse before tripping the circuit breaker for low level current faults. This allows low level faults time to clear themselves and allows electrical equipment to operate in a temporarily overloaded condition provided it will not produce permanent damage to the equipment. Examples

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