Hammond CT60A 60:5 Toroidal Current Transformer, 2.4% Accuracy

The CT60A is a 60:5 toroidal current transformer for measuring AC current up to a 60 A primary with a standard 5 A ammeter. It improves on the 50:5 model's accuracy, with a rated 2.4% at a 2 VA burden, and is aimed at electricians, panel shops and OEM equipment builders.

The unit is a toroidal current transformer fitted with a two hole mounting bracket and 24" insulated secondary leads with crimped ring connectors. A bare primary conductor may be used in circuits up to 600 V (4 KV Hi pot); at higher voltages, use a suitably insulated conductor. The series carries UL E227616 volume #1, file number X0DW2.

Overall dimensions for the CT60A are A 3.75 in (95 mm), B 1.35 in (34 mm), C 3.25 in (83 mm), D 3.00 in (76 mm), E 0.87 in (22 mm) and F 2.87 in (73 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 1.4 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. For a lower effective ratio, loop the measured conductor through the window a number of times equal to the multiple; each extra turn reduces the ratio back toward the required primary rating.