Hammond 182N9 80VA Toroidal Transformer, Dual 9V Secondary

The 182N9 is a 80 VA low-voltage toroidal power transformer from the 182 Series, built for chassis mounting in equipment that runs from 117 VAC or 234 VAC mains at 50/60 Hz. Its dual secondary windings can be connected in parallel for 9V at 8.88A, or in series for 18V centre-tapped at 4.44A, making it a flexible choice for engineers designing linear power supplies and OEM equipment around a 9V or 18V C.T. rail.

The toroidal design keeps the unit low profile, lightweight and cool running thanks to its high efficiency. The dual primary is wired in parallel for 117 VAC or in series for 234 VAC, and the units are designed to have all windings engaged. Minimum 8 in long flexible leads simplify wiring, and each design is Hi-Pot tested at 4,000 V RMS between primary and secondary.

The transformer measures 3.73 in (95 mm) in outside diameter and 1.52 in (39 mm) high, and weighs 2.15 lb according to the series table (shipping weight 2.2 lbs (1.00 kg)). Mounting is by a single centre hole through an open (non-potted) toroid centre. The 182N9 is supplied with two rubber insulating pads, one metal centering washer and all mounting hardware, including a 10-24 bolt 2.00 in long.

The 182 Series is CSA certified to C22.2 #66 (file 209651), UL recognized to UL 506 (file E207860) and CE certified to IEC 950; this part is also listed as RoHS and REACH compliant. Because toroidal transformers can draw a high magnetizing inrush current for up to about half a cycle at switch-on, Hammond advises a slow-blow fuse, time-delayed circuit breaker or soft-start circuitry on the supply line.

Note: the manufacturer lists 182N9 as replaced with 1182N9, and the 182 Series is being discontinued as a stocked series in favour of the 1182 Series, available while quantities last.