Agency certifications: UL 1950 (File E125106) UL 1585/5085-3 Class 2 and 3 (File E125107) UL94V-0-rated bobbin & shroud Dielectric strength: 4500Vrms primary to secondary Insulation system: Class B (130°C), UL 1446 (File E85315) 100% final tested: Every transformer is tested on automated panels for induced voltage (shorted turns), exciting current, open circuit voltage (turns ratio), polarity (phasing), and dielectric strength Dual primaries & dual secondaries: Must be series or parallel connected Shrouded primary & three flange bobbin design; no electrostatic shield required Immersed in 100% solids epoxy resin to withstand most aqueous and solvent cleaning systems Other primary and secondary voltages may be custom designed to your specifications Also available: Domestic, UL/CSA approved, & pin-out compatible, dual primary 115/230V SPW-300 Series