Stancor ST30 Series PCB Mount, Sealed Power Transformers. VDE, CUL, UL, CE CQC APPROVED, Vacuum Sealed, Split Bobbin Design, Self-Extinguishing, Plastics UL94V-0, Dielectric Strength: 4200Vrms, Operation Frequency: 50/60Hz, Inherently Energy Limited, Resin Class B IEC 85 (20000 h Testing to IEC 216), Conforms to EN 61558 EN 60950/UL 1585 UL506, 100% Production Tested, Ambient temperature: 70 ̊ C max. allowed, Insulation resistance: 100M Ohm min.@500VDC PRI. to SEC., Hi-Pot: 4200Vrms 1 minute@PRI. to SEC., when the primary input voltage is 230V; 2800Vrms 1 minute@PRI. to SEC., when the primary input voltage is 115V.