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Motor Protection - Cooper Industries

Motor Protection Basic Explanation Overload Protection Fast Acting Fuses Overcurrents To offer overload Protection , a protective device, depending on its application and the Motor 's Service Factor (SF), should be sized at 115% or less of Motor An overcurrent exists when the normal load current for a circuit is exceeded. It FLA for SF or 125% or less of Motor FLA for or greater SF However, can be in the form of an overload or short circuit. When applied to Motor as shown in Curve 2, when fast-acting, non-time-delay fuses are sized to the circuits an overload is any current, flowing within the normal circuit path, that recommended level the motors inrush will cause nuisance openings.

©2005 Cooper Bussmann 139 Overload Protection Overcurrents An overcurrent exists when the normal load current for a circuit is exceeded. …

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