Build configurations and capabilities
Electrical Characteristics
1-Phase, 3-Phase
50Hz and/or 60Hz, 400Hz up to 20,000Hz
Up to 600Vrms input
Nearly all needed furnace voltage transformers can be accommodated
NRTL to UL 506 or 1561
Enclosures and weather
NEMA enclosures
NEMA 1: General purpose
NEMA 3: Weather-resistant (falling dirt, windblown dust, rain, sleet, snow, formation of ice)
NEMA 3R: Same as 3, omits protection against windblown dust
NEMA 4: Watertight
NEMA 4X: Same as 4, but stainless steel
NEMA 6: Submersible
Examples of Furnace Transformers
Furnace Transformer
3-Phase, 50/60Hz
Primary=20/240/480 Vrms L-L
9-zone secondary
NEMA1 enclosure
NRTL to UL 1561, CE Mark