What is the rating for a 50 on a 12kV fuse size?

The correct answer indicates that a 50 amp fuse size on a 12 kV system is rated at 15 amps. This rating is based on standard fuse characteristics and the specific operational parameters associated with high-voltage electrical systems.

In electrical applications, the fuse size is determined by the amount of current it is designed to handle before it blows or opens the circuit to protect against overloads. A 50 amp fuse is commonly used in a range of applications, but the rating can be affected by various factors, including the voltage level and system design.

At 12 kV, the fuse must be capable of interrupting fault currents safely without sustaining damage or allowing excessive current to flow. Often, in 12 kV systems, fuses are rated at lower amperages than their physical size would suggest due to these protective requirements. In this context, a 50 fuse is calibrated to operate effectively within the frequency and insulation properties of a 12 kV environment, leading to its classification as a 15 amp rating specifically for those conditions.

This understanding is essential for linemen and electrical engineers when selecting the proper fuse to ensure both safety and system reliability.