| 1. The arc-extinguish chamber is on the upper part and the mechanism is on the lower part. This structure isconvenient for debug. |
| 2. Complex insulating structire using air and organic material; Compactable dimension and small weight. |
| 3. Vacuum arc-extinguish chamber of Cutler-Hammer Company(USA) and domestic ZMD are both applicable for the VCB. |
| 4. Simple spring operation mechanism is free from maintenance within 10000 times of operations. |
| 5. Lead-screw propeller, easy and stable operation and good self-locking capability. |
