Hammond 266JB24 24VA Transformer, 24V C.T. or 12V Parallel, Style V

The 266JB24 is a 24 VA power transformer in mounting style V with two 12 V secondaries that give 24 V at 1 A in series or 12 V at 2 A in parallel, a common choice for 24 V and 12 V control and low-voltage supplies. 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 (24V @ 1A), connected in parallel (12V @ 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 266JB24 uses mounting style V with 0.19 in (5 mm) mounting holes. Its listed dimensions are A 3.12 in (79 mm), B 2.00 in (51 mm), C 2.75 in (70 mm) and D 2.81 in (71 mm). It weighs 1.5 lbs and ships at 1.6 lbs (0.73 kg).