Hammond 1182G18 225VA Toroid Power Transformer, Dual 18V Secondary

The 1182G18 is a 225VA toroid power transformer from the 1182 Series, built for OEM engineers, panel builders and electronics designers who need a compact, low-profile chassis transformer. At 225VA with an 18V parallel output it supplies up to 12.5A, and its secondary leads step up to #16 TEW.

The primary is dual 117/234 VAC for 50/60 Hz operation: the two 117V primary windings are connected in parallel for a 117V supply or in series for 234V. The dual secondary can be wired in parallel for 18V @ 12.5A or in series for 36V C.T. @ 6.25A, and the ordering table lists voltage regulation of 7.30%. All windings are meant to be engaged (series or parallel) or connected as an autotransformer, and a connection sheet is included.

The toroidal core brings a low profile, light weight, cool running and high efficiency, and its shape keeps stray magnetic flux leakage (EMI) low. It has an open center, mechanical dimension reference G, and is manufactured using Class B (130 degree C) materials with a 4,000VAC RMS Hi-Pot test between primary and secondary. Leads come out 8"-9" and are stripped 0.5" min.; primary leads are #20 TEW and secondary leads are #16 TEW. Each unit is supplied with two 0.062" T x 3.75" OD rubber washers; one 16GA x 3.56" OD steel mounting washer; one 1/4-20 bolt 2.50" long with a lock washer and 1/4-20 hex nut. The drawing gives a unit weight of 4.85 lbs +/- 4%, and the shipping weight is 5.3 lbs (2.40 kg); the label marks it Made in Canada.

The series is UL recognized to UL 5085-1 and UL 5085-2 (file #E207860), CSA certified to C22.2 #66.1-6 and #66.2-6 (file #209651), and self-declared to applicable sections of IEC/EN61558-1 and IEC/EN61558-2-4; this part is RoHS and REACH compliant. Because toroids draw a high inrush current for up to half a cycle when energized, use a slow-blow fuse, time-delayed circuit breaker or soft-start on the supply line.