Hammond CT200A 200:5 Toroidal Current Transformer, 4.75 in Frame

The CT200A is a 200:5 toroidal current transformer and the first model in the series on the larger 4.75 in (121 mm) frame. It is rated 1.2% accuracy at a 2 VA burden and is suited to metering 200 A services and feeders with a standard 5 A AC ammeter.

Like every model in the series, it uses a toroidal core, a two hole mounting bracket and 24" insulated secondary leads finished with crimped ring connectors. The primary conductor can be bare (uninsulated) in circuits up to 600 V (4 KV Hi pot), or insulated for higher voltages. UL E227616 volume #1, file number X0DW2 applies to the series.

Overall dimensions for the CT200A are A 4.75 in (121 mm), B 1.35 in (34 mm), C 4.25 in (108 mm), D 4.00 in (102 mm), E 2.20 in (56 mm) and F 3.87 in (98 mm), with mounting slots G 0.22 in (6 mm) by H 0.37 in (9 mm). The listed shipping weight is 1.3 lbs (0.59 kg); the series table gives 1.7 lb. It is RoHS and REACH compliant.

To measure current, pass the wire carrying the current through the CT window so it acts as the primary winding, then connect the secondary to an ammeter with a 5 A movement. Its larger 2.20 in (56 mm) E dimension compared with the 150:5 model reflects the step up in frame size; confirm conductor fit against the drawing dimensions before ordering.