Current Transformer, Three Phase, 300:5, 300A, 50Hz, 400Hz, Panel
Current transformers are similar to Donut Current transformers, except that they have terminals instead of secondary leads. These are ideal for use with a digital AC ammeter and can be conveniently mounted to a panel or fixture.
Allied Electronics:
Transformer; Current; To monitor AC current; 300:5; 50 to 400 Hz; ± 1%
Newark:
Current Transformer, Three Phase, 300:5, 300 A, 50 Hz, 400 Hz, Panel