Definition of overcurrent in the Definitions.net dictionary. These devices typically consist of a manual circuit breaker or contactor and a current sensing relay which interlocks with it. Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Without some form of overcurrent protection device installed in series with the circuit conductors, the only limit of the fault overcurrent is the conductor resistance and the amount of power available from the transformer. Meaning of overcurrent. This article well explains the difference between over-current and overload. See more. What is a power supply’s OCP? The causes may include: The motor suffers an impact load or the transmission mechanism is stuck, which leads to sudden increase of the motor current. An overcurrent relay is an electrical protection device designed to cut off the power supply to a circuit, appliance, or machine in the event of an overload or failure. Overcurrent definition, a current of a magnitude that is greater than a limiting value, as the value at which a fuse melts. Overcurrent definition is - an electrical current whose intensity is higher than a specified amount. Overcurrent is generally smaller than short circuit current and within 6 times of the rated current. This can cause overheating, the effects of which can range from minor degradation of cycle life to a catastrophic thermal runaway. The basic rule for overcurrent protection of conductors—other than using flexible cords, flexible cables, and fixture wires—is to protect the conductor in accordance with the ampacities specified in Section 310.15. What does overcurrent mean? Over-current and overload are abnormal conditions occurring in a circuit. Any situation in which the current flow through a device or conductor exceeds the desired value is known as over current. Overcurrent in VFD working refers to the overcurrent of the driving system occurs in the working. Difference between over-current and overload Over-current. Electrical circuit overloads happen when more amperage is put across an electrical wire or circuit than it can handle. The possibility of over current in electric current is bigger than short circuit, especially when electric motor switches on and has positive and negative inversion frequently. The meaning of a PSU’s overcurrent protection function and multi-rail vs. single-rail PSUs explained. Depending on how much the rating is exceeded, the tolerable time decreases. The general requirement for overcurrent protection of conductors is provided in Section 240.4, Protection of Conductors. In an electric power system, overcurrent or excess current is a situation where a larger than intended electric current exists through a conductor, leading to excessive generation of heat, and the risk of fire or damage to equipment. 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