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Understanding Trip Curves - c3controls

Understanding Trip CurvesIntroduction to trip Curves for UL 489 Miniature Circuit Breakers and UL 1077 Supplementary Curves , aka time current Curves , can be an intimidating topic. The goal of this short paper is to introduce you to the concept of trip Curves and explain how to read and understand is UL?Underwriters Laboratories (UL) was established in 1894 as the Underwriters Electrical Bureau, a bureau of the National Board of Fire Underwriters. UL was founded primarily to provide independent testing and certification for the fire safety of electrical products. Those products include circuit protection devices discussed in this Protection DevicesCircuit protection is employed to protect wires and electrical equipment from damage in the event of an electrical overload, short circuit or ground fault.

Trip curves plot the interrupting time of overcurrent devices based on a given current level. They are provided by the manufacturers of circuit protection devices to assist users with selecting devices that provide proper equipment protection and performance, while avoiding nuisance tripping. Tells you how this behaves. Understanding Trip Curves

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Introduction - c3controls

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The rating of the motor starter is based on the size and type of load for which it was designed. Starters conform to the standards and ratings from Underwriters Laboratories (UL), Canadian Standards Association (CSA), International Electrotechnical Commission (IEC) and National Electrical Manufacturers Association (NEMA).

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