- Electronic Products & Components Processing[2]
- Circuit Breakers[1]
- Electronic & Instrument Enclosures[4]
- Other Electrical Equipment[10]
- Power Distribution Equipment[10]
- Other Power Supplies[1]
- Switching Power Supply[1]
- Other Switches[3]
- Electrical Contacts and Contact Materials[5]
- Energy Saving Equipment[1]
- Other Motor[3]
ZN28A-12 series indoor high voltage vacuum circuit breaker
ZN28A-12 mainly installed in fixed switchgear cabinet to be used in industrial and mineral enterprises
1.ZN28A12 series indoor high voltage vacuum circuit breaker is a kind of indoor device of 3 phase,
50Hz, 12KV rated voltage, mainly installed in fixed switchgear cabinet to be used in industrial and
mineral enterprises, power plant and transformer substations for purpose of protection and control,
it is suitable for frequently operated equipments.
2. Structure and features:
The product is of fixed style vacuum circuit breaker particularly used on switchgear cabinet, it doesn’t carry any operation mechanism on itself and therefore need to be equipped with appropriate
operation mechanism when being put to use.
3.Working principle
The circuit breaker is equipped with intermediately sealed longitudinal magnetic vacuum arc-chute, when both the static and movable contacts are opening when being manipulated by
operation mechanism, the electric arc between the contacts blazes in the vacuum and will soon be
quenched when the current is going through the zero cross point; on account of the special
structure of the contacts, longitudinal magnetic field will be produced appropriately by the contacts
during the burning of the arc and this magnetic field works to spread the arcs evenly on the surface
of the contacts, this therefore maintains a rater low arc voltage, and offers the vacuum arc chute a
relatively high recovery speed of the medium durability after arcburning, consequently, the
making/breaking capacity of the circuit breaker and its life expectancy are boosted.