Current notation in brackets ( ? )

Good day, This is my first post here, and I appreciate all responses. I have been trying to find an answer but the nature of the question makes it difficult to search for in a practical sense. What does the numbers in bracket mean when viewing current specifications for a device? eg. 5 (50)A My guess is that 5A is the nominal value, while 50A is the max value but for a brief time, or possibly with the use of a CT. The device is an in-line watt meter. Thanks.