| Item |
Unit |
Data |
| Rated voltage / Maximum working voltage |
kV |
12kV/12kV |
| Rated current |
A |
20kA: 630, 1250; 25kA: 630, 1250; 31.5kA: 630, 1250, 1600, 2000, 2500; 40kA: 1250, 1600, 2000, 2500, 3150, 4000 |
| Rated short-circuit breaking current |
kA |
20 / 25 / 31.5 / 40 |
| Rated short-circuit making current (peak) |
kA |
50 / 63 / 80 / 100 |
| Rated peak withstand current |
kA |
50 / 63 / 80 / 100 |
| 4s rated short-time withstand current |
kA |
20 / 25 / 31.5 / 40 |
| 1min power frequency withstand voltage |
kV |
42 (phase-to-phase, to earth) / 48 (across open contacts) |
| Lightning impulse withstand voltage (peak) |
kV |
75 (phase-to-phase, to earth) / 85 (across open contacts) |
| Rated operating sequence |
— |
O-0.3s-CO-180s-CO |
| Mechanical endurance (mechanical life) |
operations |
10000 |
| Breaking times of rated short-circuit breaking current |
times |
30 |
| Closing / opening operating voltage |
V |
AC/DC 110, 220 |
| Contact opening distance (clearance between open contacts) |
mm |
11±1 |
| Over-travel (compressed length of contact spring) |
mm |
3.5±0.5 |
| Three-phase opening and closing asynchronism (non-simultaneity) |
ms |
≤2 |
| Contact closing bounce time |
ms |
≤2 (≤3 for 40kA) |
| Average opening speed |
m/s |
0.9~1.3 |
| Average closing speed |
m/s |
0.5~0.8 |
| Opening time |
ms |
≤50 at maximum operating voltage; ≤80 at minimum operating voltage |
| Closing time |
ms |
≤100 |
| Main circuit resistance of each phase |
μΩ |
≤50 (for lower current ratings) / ≤45 |
| Accumulated allowable wear thickness of moving and fixed contacts |
mm |
3 |
Huanghua Group Co., Ltd. 
