Hammond 374XP 141 VA 750V C.T. Potted Plate & Filament Transformer

The 374XP is a 141 VA potted high voltage (plate) and filament power transformer from the 300P Series, built for designers and builders of equipment that need a plate supply and heater windings from one universal-primary transformer. It supplies 750V C.T. at 127 mA with a 5V C.T. 3 A filament and a 6.3V C.T. 5 A filament; its part drawing documents lead colours, excitation current, no-load voltages and winding resistances.

The transformer is enclosed in a drawn steel case and completely potted in epoxy, finished in black powder paint to match the 1650P series of potted output transformers. Windings are concentric wound for low stray field and low noise, and a Faraday copper primary shield reduces capacitive coupling from the primary, attenuating higher frequency current coupling to the secondaries; the shield is internally grounded to the end bell.

The primary accepts 100, 110, 120, 200, 220, 230 or 240 VAC at 50/60 Hz. The 750V C.T. high voltage secondary is rated 127 mA and includes a 50 VAC bias tap (measured with the high voltage C.T. grounded), and the unit also provides a 5V C.T. @ 3A filament winding and a 6.3V C.T. @ 5A filament winding. It can be run full wave bridge or full wave C.T. The series is hipot tested at 2,000 VAC and is c UL us recognized (E207860), and the part drawing lists a primary-to-secondary hipot of 2500V, 60Hz for 1 second.

Listed dimensions are A 4.25 in (108 mm), B 5.00 in (127 mm) and C 5.44 in (138 mm). The 374XP mounts using 1/4-20 threaded inserts, mounting hardware is included, and the shipping weight is 5.6 lbs (2.54 kg). All leads exit 8 in minimum and are stripped 0.5 in.