What is the maximum output of current transformer's secondary side in a typical application?

In typical applications, the maximum output of a current transformer's secondary side is often standardized at 5 amps. This standardization is widely accepted in the electrical industry, particularly for metering and protection purposes.

Using a 5-amp rating allows for compatibility with a range of protective relays and metering devices, facilitating their integration into various systems. The 5-amp output also ensures a balance between operational safety, measurement accuracy, and manageable physical size of the transformer.

While higher outputs, such as 10 amps or even 15 amps, may be found in specialized applications, they are not the norm for most standard installations, making the 5-amp option the most recognizable standard in the majority of current transformer applications.