Hammond 266F12B 3.6VA 12V/6V Dual Secondary Power Transformer

The 266F12B is a 3.6 VA power transformer rated 12 V at 0.3 A with its secondaries in series (center-tapped) or 6 V at 0.6 A in parallel, from a 117/234 VAC, 50/60 Hz dual primary. It is a small open-style part for low-current 12 V or 6 V AC needs.

The primary accepts 117 or 234 VAC at 50/60 Hz; the 266 Series connection diagrams show the primaries wired in parallel for 117 VAC and in series for 234 VAC. The secondaries can be used as a center tapped secondary (12V @ 0.3A), parallel connected (6V @ 0.6A) or used individually, and the unit is designed for use with all windings engaged. Every unit is hi-pot tested at 2,000V RMS.

Construction is open style with minimum 6" long leads and a dual bobbin design, so no electrostatic shield is required. Class B insulation (130 °C) is used for extra protection, and the design is UL listed as a Class A (105 °C) design.

It shares the 2.38 in (60 mm) body of the 266F12C but is rated 0.3 A at 12 V rather than 0.35 A. The ordering table gives mounting style A, dimensions A 2.38 in (60 mm), B 1.48 in (38 mm), C 1.43 in (36 mm) and D 2.00 in (51 mm), a mounting hole width of 0.19 in (5 mm) and a weight of 0.4 lb (0.18 kg); shipping weight is 0.4 lbs (0.18 kg).

The series is UL listed (# E207860) Type 3AH and CSA certified (209651), and the 266F12B is listed as RoHS and REACH compliant (UPC 623980024837).