Suitable for emergency and standby applications. UL 1008 listed at 480 VAC. CSA certified at 600 VAC. IEC 947-6-1 listed at 480 VAC. Open type, NEMA 1, 3R, 4, 4X and 12. Specifications may vary. Confirm full specs prior to ordering. Download the spec sheet (s) 225 Amp GE 3 Pole 480 VAC ZTG Auto Transfer Switch.pdf.