Hammond 183K20 56VA 20V Center-Tapped Dual Primary PCB Transformer

The 183K20 is a 56VA low voltage power transformer for printed circuit board mounting, part of the 183 Series of universal PCB transformers. It is aimed at OEM engineers and electronics designers who need an isolated low-voltage AC supply on a board that must run from either 115 or 230 VAC mains at 50/60 Hz.

In the 56VA K size, the 183K20 is the 20V C.T. option: 2.8A with the secondaries in series, or 10V at 5.6A with them in parallel, giving more current than the 24V, 28V and 36V K models. The dual winding secondaries are non-concentrically wound and can be wired in series, in parallel or used separately; when they are connected in series (pin 9 to pin 10) that junction acts as the center tap.

Construction is a low profile split bobbin with a top shroud, Class F insulation rated 155 degrees C and a 4,000V RMS hipot. Low primary-to-secondary coupling means no electrostatic shield is required. The body measures 3.00 in long, 2.50 in wide and 1.81 in high, with a listed unit weight of 1.7 lbs for the 56VA size; the shipping weight is 1.59 lbs (0.72 kg).

The transformer uses P.C. board pins on industry standard spacing, with 0.045 in square pins and four hole mounting for #6 screws (mounting screws not provided). It is cUL listed, and RoHS and REACH compliant.