Hammond 266M18 54VA Transformer, 18V C.T. at 3A or 9V 6A

The 266M18 is a 54 VA open-style power transformer rated 18 V center tapped at 3 A, or 9 V at 6 A with its two secondaries in parallel, for 18 V and 9 V low-voltage supply circuits. 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 (18V @ 3A), connected in parallel (9V @ 6A) 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 266M18 uses mounting style A with 0.19 in (5 mm) mounting holes. Its listed dimensions are A 4.03 in (102 mm), B 2.50 in (64 mm), C 2.63 in (67 mm) and D 3.56 in (90 mm). It weighs 2.68 lbs (1.22 kg) and ships at 2.2 lbs (1.00 kg).