An overcurrent protection (OCP) device is an electronic device that interrupts the circuit when a permissible current is exceeded, thereby preventing an excessive temperature rise in the power conductors.
Overcurrent protection devices safeguard the power lines, electronic components, switching contacts, and relay contacts against excessive currents. Unlike overload protection devices, electronic overcurrent protection circuits have short response times
and respond to short circuits and momentary overcurrent conditions such as those that occur during lightning strikes and high static discharges. The rating
ofovercurrent protection devices is based on the wire size or cable diameter and the potential fault current for the line-side connections of
the devices. Overcurrent Protection Devices (OCPD) are used in main power lines, in feeder lines, and in branch circuits in residential, commercial, and industrial buildings.