Power Transformers Specs
The Standard Power Transformer Line of toroids is characterized by its tight regulation, for applications where off load voltages are a concern; and very low temperature rise, which is useful for high ambient operating conditions, or where instantaneous power – in excess of rating – is required. Dual inputs (115/230 VAC) are standard, as are potted centers and stranded leads. Plitron makes a broad range of high quality, approved, toroidal transformers. Designed for general purpose applications. Three separate primary input configurations are shown on this site.
|Input VAC||Description||Code||F||Compatible With Inputs|
|1||117||North American, Single 117 V||A||60||117|
|2||2 x 115||European, Dual x 115 V||7||50-60||Series / Parallel Connection for 115 or 230|
|3||2 x 0-100-120||Global, 2 x 120 V tapped at 100||5||50-60||Series / Parallel / Tapped Connections for 100, 120, 200, 220, or 240 VAC|
|Power||Weight||Nominal Dimensions (mm)|
The selection chart is an aid to building a PLITRON part number. Part number listings by power level are available in the Ratings Table. The example, shown below, part number 087026201, describes a 500VA toroidal transformer with a dual input (115/230 VAC), 2 x 40 VAC outputs (at 6.25 A each), a potted and drilled center, and stranded leads. * Options. Subject to minimum order.
Three input configurations are offered. The standard input is dual 115 VAC windings (Type 7), parallel connected for 115 VAC, or series for 230 VAC at 50 / 60 Hz. Optional input type A is a single 117 VAC winding at 60 Hz. Type 5 is an optional 6 wire input, dual 0-100-120 VAC windings, series or parallel connected for 100, 120, 220 or 240 VAC at 50 / 60 Hz. See schematics for more details.
Primary to secondary: Polyester tape, class B (130°C). 50 Hz transformers, four layers minimum. Meets the test requirement of >4 kV for one minute. 60 Hz transformers, three layers minimum, >2.5 kV for one minute. Interwinding secondary (where required) and outer insulation: Polyester tape, two layers minimum.
Maximum 50°C. At maximum rated load, continuous.
See ratings table for output voltage and current ratings. Dual secondaries are bilfilar wound where possible for optimum coupling, and theoretically perfect balancing. Output Tolerance – Better than 3% at full load.
See ratings table. Figures given are for 60 Hz operation, for 50 Hz operation figures increase slightly.
All units in this series are supplied with a potted center and an integral neoprene washer base. The potting compound is UL-HB approved, or better. Alternate mounting: supplied with steel cup disk, 2 neoprene washers, a bolt, nut and flat washer. See mechanical table for details.
Standard: Stranded tinned copper wire (CSA TEW, UL-1015, 105°C). Stripped 6 mm. Finished length: 350 mm. Optional: Magnet wire self lead, PVC sleeved .031” wall. Stripped 6mm. Finished length: 200 mm.
Optional: Normally closed thermal switch in series with primary, auto resetting , or a one shot thermal fuse. In series with primary for 60 Hz transformers. Separate lead outs for 50 Hz units, insulated stranded wire(yellow). Both open at 120°C core temperature. UL, CSA listed components.
Optional: To reduce capacitive coupling, and/or create a physical barrier, between primary and secondary. Copper foil laminated between polyester tape. Wound over primary. Terminated at one end by insulated stranded wire (green/yellow).
To attenuate stray magnetic fields. Multiple layers of grain oriented silicon steel laminated between insulation. Wrapped around circumference of transformer. Increases OD by approx. 1mm.
Options (Type A and type 5 primaries, screens, shields, solid wire leads, and thermal protection) are subject to a minimum order of ten units.