- Products - Load Break Switches 3SGL Load break switches Overview From 125 A to 630 A; Size A, B, C, D and E. Applications and functions Features Front operation; Both internal handle and external handle are available; Technical specifications Standards: IEC 60947-3 Rated voltage: 400 V AC Rated insulation voltage: 800 V AC Number of poles: 3-pole, 4-pole Rated frequency: 50/60 Hz Rated short-time withstand current for 1 s Icw: 10 to 25 kA Rated making capability at 400 V AC under AC 23: 1250 A to 4000 A Rated breaking capacity at 400 V AC under AC 23: 1000 A to 3200 A