Hammond 266J25 25.2VA Transformer, 25.2V C.T. or 12.6V Parallel

The 266J25 is a 25.2 VA open-style power transformer for equipment designers who need a 25.2 V center-tapped rail at 1 A, or 12.6 V at 2 A with the secondaries paralleled, from a 117 V or 234 V line. It belongs to the Hammond 266 Series of low voltage/filament transformers and is aimed at OEM engineers, repair technicians and panel builders who mount the transformer directly to a chassis.

The primary is a dual 117/234 VAC, 50/60 Hz winding: connect the two primary halves in parallel for 117 V or in series for 234 V. The dual secondaries can be used as a center-tapped secondary (25.2V @ 1A), connected in parallel (12.6V @ 2A) or used individually, and the unit is designed for use with all windings engaged.

Construction is open style with a dual bobbin design, so no electrostatic shield is required. Hammond uses Class B (130 °C) insulation for extra protection, while the design is UL listed as Class A (105 °C). Every unit is hi-pot tested at 2,000V RMS, and all leads are a minimum of 6 in long. The transformer is UL listed (# E207860) Type 3AH, CSA certified (209651), and RoHS and REACH compliant.

The 266J25 uses mounting style A with 0.19 in (5 mm) mounting holes. Its listed dimensions are A 3.25 in (83 mm), B 2.06 in (52 mm), C 2.00 in (51 mm) and D 2.81 in (71 mm). It weighs 1.25 lbs (0.57 kg) and ships at 1.5 lbs (0.68 kg).