Circuit breakers are very important in electrical systems. They are intended to guard circuits against overcurrent or short circuit that can damage the circuits. The circuit breakers can be categorized in many types and are used in varying applications. Knowledge of these types contributes towards the right choice of the circuit breaker type needed for any given system.
Vacuum Circuit Breaker (VCB)
Vacuum circuit breaker is used for medium voltage application most of the time. It employs vacuum as the arc extinguishing medium. In case of a fault, the contacts open and because of the vacuum in the interrupting chamber the arc is quenched. This type of breaker is characterized with low maintenance, higher operational life, and faster arc extinction. For example, VTZ-12 Vacuum Circuit Breaker which is produced by Shaanxi West Power Tongzhong Electrical Co., Ltd., used for 12kV system and the rated current ranging from 630A to 5000A. The VTZ-17.5 Vacuum Circuit Breaker is another popular model designed for 17.5kV systems. The vacuum circuit breakers apply in power plants as well as for power grids.
Oil Circuit Breaker (OCB)
The oil circuit breaker employs oil as the arc-putting out medium. It is used in high voltage systems. Upon the opening of the breaker, the oil absorbs the heat and quenches the arc. These types of breakers however need more maintenance and are not commonly used presently attributed to the numerous safety issues and additionally policies on environmental conservation. However, they are still utilized in several old-fashioned systems chiefly owing to durability and high reliability.
SF6 Circuit Breaker
The SF6 circuit breaker utilizes sulfur hexafluoride (SF6) gas in order to put out the arc. This kind of breaker is used mostly for high voltage circuits, they are mostly found in sub stations. The compact circuit breaker designs are possible with SF6 as an insulating medium. LW9-72.5 Outdoor High Voltage Porcelain SF6 Circuit breaker and LW25-126 Outdoor High Voltage Porcelain SF6 Circuit breaker are provided by Shaanxi West Power Tongzhong Electrical Co., Ltd. for large scale industrial and power grid usage. These breakers provide high performance and are normally selected when constructing power infrastructure.
Air Circuit Breaker (ACB)
The medium used in the air circuit breaker to put off the arc is air. It is mainly applied in the distribution network of low voltage. When open circuit breaker, the air cools and put off the arc. ACBs are employed in places where the fault currents are relatively small, and where reliability and low cost are important.
Molded Case Circuit Breaker (MCCB)
The MCCB is widely installed in residential and commercial electrical systems. It guards against both overloads as well as short circuits. They are found in a variety of current ratings and are very simple to install and operate as well. It can be applied in the low voltage systems and manufactured for, panel and distribution boards as well as circuit protection.
If you have any needs, please contact directly: xdtz03@westpowerelectric.com or WhatsApp 86 18091765658.
