Model NEMA1 UL67 StanModel NEMA1 UL67 Standard · BKL-NF1 * (orbital type) - up to 100 thousand A @ 240 V, 65 kA @ 480 V - W24 in. Maximum 480 V, approximately 250 A · BKL-NF2 * (orbital) - Maximum 480 volts, about 600 amperes Up to 100 ka @ 240 / 480V-W33 " · BKL-NF3 * (bolted type) - Maximum 480 volts, about 1200 amperes Up to 100 ka @ 240 / 480V-W28 "/ 36" / 40 " Model NEMA1 UL891 Standard BKL-IL1 * (front and rear operable) Up to 480 V, 100 kA, 4000A W26 "(C / D frame), W30" / 36 " (E-frame), W44 inch (G-frame) · BKL-IL2-G * (front and rear operable) Up to 480 V, 100 kA, 4000A -W28" /36”/42" /46"/50” · BKL-IL2i * (rear operation) Up to 480 V, 100 kA, 6000A W32 inch (D / E frame), W44 inch (G frame) BKL-IL2-G * (front and rear operable) Up to 480 V, 100 kA, 6000A -W28” /36 " /42” /46” /50” · Non-AR models only