The difference between high voltage load break switch and vacuum circuit breaker 

The difference between high voltage load break switch and vacuum circuit breaker   

Load Break Switch
It has a simple arc extinguishing device and can be used as a control apparatus for dividing and closing circuits with load. It can break certain load current and overload current, but cannot break short-circuit current, and must be used in series with high-voltage fuse to remove short-circuit current with the help of fuse.

The role of the Load Break Switch
1. Open and close cooperation.
Since it has a certain arc extinguishing capacity, it can be used to open and close load currents and overload currents of less than a certain multiple (usually 3-4 times); it can also be used to open and close no-load transformers with a larger capacity than that allowed by the isolation switch, longer no-load lines, and sometimes also used to open and close large-capacity capacitor banks.

2. Replacement role.
Load break switch and current-limiting fuse series combination can be used instead of circuit breakers. That is, the load switch is responsible for opening and closing less than a certain number of times the overload current, while the current-limiting fuse is responsible for opening and closing the larger overload current and short-circuit current.

3. Load break switch and current-limiting fuse series combination into one load switch, in the national standards known as “load switch – fuse combination appliances”. The fuse can be installed on the power side of the load break switch, or on the receiving side of the load break switch. When it is not necessary to change the fuse frequently, it is appropriate to use the former arrangement so that the load break switch can be used as a disconnecting switch to isolate the voltage added to the current-limiting fuse.

Vacuum Circuit Breaker
Because of its interrupting medium and the insulation medium of the contact gap after interrupting is high vacuum and so named; it has the advantages of small size, light weight, suitable for frequent operation and interrupting without maintenance, and is more popularly used in the distribution network.
The vacuum circuit breaker is an indoor power distribution device in 12~40.5kV, 50Hz three-phase AC system, which can be used for protection and control of electrical equipment in industrial and mining enterprises, power plants and substations, especially for the use of oil-free, less maintenance and frequent operation, the circuit breaker can be configured in the middle cabinet, double cabinet, fixed cabinet as control and protection of high-voltage electrical equipment.

1.Vacuum circuit breaker working principle
When the dynamic and static contacts in the role of the operating mechanism, the contacts between the arc, the contact surface in the high temperature volatile steam, due to the contact design for a special shape, in the current through a magnetic field, the arc under the action of this magnetic field along the contact surface tangential direction of rapid movement, in the metal cylinder (shield) condensed part of the metal steam, the arc in the natural over zero extinguished, between the contacts of the medium strength and quickly recover up.

2. The role of vacuum circuit breaker
The vacuum circuit breaker has the function of overload, short circuit and undervoltage protection, and has the ability to protect the line and power supply.

The difference between high-voltage load break switch and vacuum circuit breaker
1. High-voltage load break switch can be broken with load, with self-extinguishing function, but its breaking capacity is very small and limited, can not break the short-circuit current, so it is generally used in series with high-voltage fuse, with the help of fuse to short-circuit protection.

2. High-voltage vacuum circuit breaker breaking capacity can be made very high in the manufacturing process. It mainly relies on the addition of current transformers with secondary equipment to protect. It can have short-circuit protection, overload protection, leakage protection and other functions.