Switch disconnector 500 A, Size 4, 4-pole Front operating mechanism center Basic unit without handle flat terminal 3KD switch disconnector up to 1600 A as efficient master, emergency stop or maintenance switch. 3KD switch disconnectors up to 1600 A from Siemens offer reliable operator protection and ensure high plant availability in industry, infrastructure and buildings. As main, EMERGENCY OFF or maintenance switches, 3KD switch disconnectors reliably connect and disconnect live electrical equipment and provide a safety isolating function and isolating distance in low-voltage circuits. 1. Reliable protection from electrical accidents. 2. Rugged technology for high system availability. 3. Wide range of applications with variable connection and operating mechanism types. 4. Simple retrofitting of additional functions with an extensive range of accessories. 5. Quick installation on the standard mounting rail with frame sizes up to 200 A. 6. Efficient engineering with extensive CAx data. 7. Simple documentation with the manual configurator. 8. Suitable for wind power and solar plants.