1. PK-12-30         Two-level deviation switch
2. NST1-12-30KBW-220P      explosion-proof two-level deviation switch
3. HFKPT1-10-30         explosion-proof two-level deviation switch
4. KBW-220P        explosion-proof two-level deviation switch
5. HFKPT1-20-35        Two-level deviation switch TAG：