Main features - 1-Phase AC current transformer- 3-Phase AC current transformer- True RMS current transformer- AC transformer with 7 knob selectable ranges Applications Carlo Gavazzi offers a wide range of current transformers for monitoring relays. In 3 phase current transformers (type MI and MP3, for 5, 20, 100 or 500 AAC), the output voltage is proportional to the highest measured current. The true RMS AC current transformers - Types A82.- can be directly connected to a PLC. Small AC current metering transformers with 7 knob selectable range is suitable for most application and easy to install, for mounting on DIN rail or directly on surface by screws.