Detailed Product Description
Vacuum Circuit Breaker (ZN73A Series)
General
also called ZN73A-12/D type indoor high-voltage permanent magnetic vacuum circuit breaker , an advanced product in China ,adopts self-developed CHYG type permanent magnetic operating mechanism with either manual swithching off or electric switching on /off function , which leaves out complex and damageable energy stoage and locking device of traditional spring mechanism , and greatly simplifies transmission link , especially for the manual switching off device . it is with load emergent switching off operation when it is used in fault condition of secondary operating circuit , which truly realizes high reliablility , long service life , examination and repair exemption , simple maintenacnce . the service life reaches 10000 times in normal condition .
Technical Parameter
| Item | Unit | Parameter | |||
| Rated voltage | KV | 12 | |||
| Rated current | A | 630-1250 | 1250-3150 | 1250-4000 | |
| Rated Frenquency | Hz | 50 | |||
| Rated short-circuit interrupting current | KA | 20 | 25 | 31.5 | 40 |
| Phase distance | mm | 210 | 275 | ||
