Hammond 166Q6 6.3V C.T. 6A 37.8VA Power Transformer

The 166Q6 is a low voltage/filament power transformer from the 166 Series, rated 37.8 VA with a 115V 60 Hz. primary and a 6.3 V center-tapped (C.T.) secondary rated 6 A RMS. It is built for OEM engineers, panel builders and repair technicians who need an open style, channel bracket, two hole chassis mount transformer to derive a low AC voltage inside equipment. The 166Q6 supplies 6.3 V C.T. at 6 A, a 37.8 VA rating, from a 115V 60 Hz line.

Construction follows the 166 Series design: a dual bobbin winding arrangement, so no electrostatic shield is required, and Class B insulation (130 °C) for extra protection, with the design UL listed as Class A (105 °C). Each unit is Hi-Pot tested at 2,000V RMS. Leads are a minimum of 6 in long. The drawing schematic shows black primary leads, green secondary leads and a green/yellow center tap.

Overall dimensions from the series ordering table are A 3.69 in (94 mm), B 2.00 in (51 mm) and C 2.31 in (59 mm), with a D dimension of 3.13 in (80 mm) and 0.19 in (5 mm) mounting holes (mounting reference C). The shipping weight is 1.7 lbs (0.77 kg). The part drawing gives the mounting hole size as 0.187 in / 4.7 mm width-wise.

The 166 Series is UL listed and CSA certified, and the 166Q6 is marked RoHS compliant and REACH compliant. Identifiers include UPC 623980215617 and UNSPSC 39121301. If you need 117/234V or 50/60 Hz operation or dual secondaries, the manufacturer points to its 266 Series instead.