Hammond 739 1610 VA 3,500V C.T. Plate Transformer, 115V Primary

The 739 is a 700 Series high voltage (plate) transformer rated 1610 VA, with a single 115 VAC, 50/60 Hz primary and a 3,500V C.T. R.M.S. high voltage secondary. It suits builders and service technicians who need a centre-tapped plate winding for a rectified high voltage supply running from a 115 VAC line.

The high voltage secondary is rated 375ma under CCS (Continuous Commercial Service) and 565ma under ICAS (Intermittent Commercial or Amateur Service); the 1610 VA figure is a CCS rating. The unit can be run in either a full wave bridge or a full wave C.T. rectifier circuit, and the series design guide gives the voltage and current factors for each rectifier and filter arrangement.

Construction is enclosed with a 4 hole chassis mount and minimum 6" long leads. Insulation is Class A (105 degrees C), each design is Hi-Pot tested at a minimum of twice the secondary voltage, and the series is CSA certified (209651). Because the 3,500V C.T. secondary is at 2,000 VAC or above, its leads are brought out through rubber bushings. The part is listed as RoHS and REACH compliant.

Primary wiring for the 739 is simple: the 115 VAC input is on the Black and Black leads. The same 1610 VA, 3,500V C.T. rating is also offered as the 739A, which has a dual 117/234 VAC primary. Shipping weight is 34.7 lbs (15.74 kg).

Note that the part's short description reads "1400VA", while its long description, attributes and the series table all rate it at 1610 VA, the highest VA rating in the 700 Series.