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Low-Voltage Current Transformers Low-voltage current transformers are designed for use in low-voltage distribution equipment (with an insulation voltage up to 750 V) with rated primary currents ranging from 1 to 3000 A. The standard rated secondary current of the transformer is 5 A, but versions with a secondary current of 1 A can ...

Low-Voltage Current Transformers

Low-voltage current transformers are designed for use in low-voltage distribution equipment (with an insulation voltage up to 750 V) with rated primary currents ranging from 1 to 3000 A.

The standard rated secondary current of the transformer is 5 A, but versions with a secondary current of 1 A can also be provided. Accuracy classes 0.5, 0.5S, 1, and 3 are intended for measurement circuits; these transformers have an overcurrent factor (n) of <5 or <10. Depending on specific customer requirements, transformers in better accuracy classes (0.1, 0.2, 0.2S) or in accuracy classes 5P or 10P for protection circuits with a higher overcurrent factor can also be supplied.

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Calculator: size the secondary wiring of your current transformers

Calculator: size the secondary wiring of your current transformers

Sizing the secondary wiring of measuring current transformers is one of those jobs that often gets done by guesswork, yet the accuracy of the whole measurement depends on it. So we built an online calculator that works out the circuit burden and the maximum cable lengths for you. It is free, needs no registration and runs on your phone.