... : single pole high quality SW-10 Series Explosion Proof Light Switch (IIB, DIP)•Application1. Design for Explosive atmosphere Zone 1, ... 20 , Zone 21, Zone 222. Designed for Groups IIA,IIB Temperature classes T1~T63. Designed for sites with explosive atmosphere such ... powder coated surface after shot blasted.2. Built-in combination switch with stable property.3. Special designed water resistance and dust ...