First introduced in 1907, Square D brand safety switches have a long history of leadership in safety and performance. VisiPacT safety switches play a crucial role in today's commercial and industrial settings. They isolate power in daily activities and provide an effective way to interrupt power in an emergency. 2 primary applications for safety switches are as a lockout line of sight disconnect and as a circuit isolation device. Square D VisiPacT heavy-duty safety switches continue to bring the reliability and trusted performance that you expect. VisiPacT covers 30 Amp to 200 Amp and up to 240-Volt/600-Volt with a viewing window as standard. 3 types of enclosures: Type 1, Type 3R, Type 12.