What is Circuit Breaker？ A circuit breakeris an electrical device used in an electrical panel that monitors and controls the amount of amperes (amps) being sent through the electrical wiring. Circuit breakers come in a variety of sizes. For instance, 10, 15 and 20 amp breakers are used for most power and lighting needs in the typical home. Some appliances and specialty items (washers, dryers, freezers, whirlpools, etc.) will require a larger circuit breaker to handle the electrical load required to run that appliance. If a power surge occurs in the electrical wiring, the breaker will trip. Essentially, a circuit breaker is a safety device. When a circuit breaker is tripped, it may prevent a fire from starting on an overloaded circuit. It can also prevent the destruction of the device that is drawing the electricity.While a number of older homes and buildings still use fuses to monitor the electrical load, almost every newer home has circuit breakers in the electrical panel. Fuses perform much the same duty as circuit breakers. However, circuit breakers are safer to use than fuses and easier to fix. When the power to an area shuts down, the homeowner can look in the electrical panel and see which breaker has tripped to the "off" position. The breaker can then be flipped to the "on" position and power will resume again.Common circuit breaker includeminiature circuit breaker, residual current circuit breaker(RCCB), residual current circuit breakerwith overload protection(RCBO), leakage circuit breaker, moulded case circuit breaker(MCCB) and air circuit breaker(ACB).

09 OCT 2019

Understanding Difference between RCCB, RCBO and RCD RCCB: Residual Current Circuit Breaker As the name suggest, the basic Principle of this circuit breaker is to operate on Residual current.How does it work? RCCB is designed to detect current difference between Phase (Live) and Neutral. This current also known as Residual Current. As in normal operating condition, Phase and Neutral will always have a balance current, however, when there is a fault or potential hazard residual current will occur.For healthy circuit, always amount of current flows through Phase should return through Neutral. If there is any mismatch it will be detected by RCCB.In other words, RCCB will operate when there is earth fault. RCCB is very useful device to protect individual from electric Shock.RCCBs will detect current as low as 30mA, which is very small to detect by other means of device. However, RCCB are always used in conjunction with other protective device like MCB. As RCCB are only designed to detect residual current and not to trip on overload/short circuit. RCCB are shown for rated current, however, that rating is only indicating normal operation current that RCCB can carry.The most widely used RCCB are 30mA and 100 mARCBO (Residual Current Breaker with Overload) As the name suggest the operating fundamental of RCBO is to operate on residual as well as overload current. RCBO is combination of MCB and ELCB (RCCB).When current imbalance occur, the residual current circuit (RCCB) will operate and when there is overload in circuit, the circuit breaker (MCB) will operate. RCD (Residual Current Device) Generally, RCD are being used for RCCB. However, RCD is a generic term referring to any kind of device that automatically disconnect circuit when residual current exceeds the specified limit.The term RCD tends to refer to power socket level implementation of RCD. It can be built in feature or external connected between socket and appliance.As RCD are generally designed to operate on residual current only and not on overload, RCDs are termed more closely with RCCB and not with RCBO.

30 AUG 2018

Economic data point to further growth China released upbeat macroeconomic data on Tuesday indicating that the economy remained on solid footing at the start of the year, and analysts said the trend will continue through the year.Industrial output rose by 6.3 percent year-on-year in the first two months, according to the National Bureau of Statistics.Fixed asset investment, a major driver of growth, increased by 8.9 percent year-on-year in the first two months, down from 10.2 percent in the same period last year. But it was the fastest pace since July.Real estate investment increased by 8.9 percent in the period, up from 3.0 percent in the first two months of last year. It beat market expectations against the backdrop of tightened regulations since October to combat speculation.Retail sales, however, increased by 9.5 percent in the period, down from 10.2 percent in the same period last year.Most data are “quite positive” and “apparently improving”, NBS spokesman Sheng Laiyun told a news conference. “On the whole, in the first two months, the national economy continued the stable and improving growth momentum since the second half of last year,” he said.Sheng also said data in the first two months show the country's economic restructuring has made progress. For example, industrial output in the high-tech and equipment industries increased by 12.6 percent and 11.9 percent, respectively－both higher than the growth of overall industrial output. Fixed asset investment in high-tech industries, meanwhile, rose by 18.4 percent.“China's domestic and external demand has picked up, with export, manufacturing investment, real estate investment and infrastructure all expanding at a faster-than-expected pace,” said Ren Zeping, chief economist of Founder Securities. “The Chinese economy is starting to step out of slowdown and enter a cycle of recovery.”Hu Yuexiao, chief macroeconomic analyst at Shanghai Securities, said: “Investment remains China's main growth engine, and its pickup means the Chinese economy has started to stabilize. It will maintain the trend of stabilization and continue to improve this year.”

15 MAR 2018

IMF: global economy shows more positive momentum, warns of inward-looking policies International Monetary Fund (IMF) on Tuesday said that the global economy is showing more positive momentum, but warned that inward-looking policies and sharp tightening in global financial conditions could threaten the growth momentum.“Near-term global growth is expected to pick up, reflecting a firming-up of activity in advanced economies, an anticipated shift in the macroeconomic policy mix in the United States, and stabilization in stressed emerging economies,” said the IMF in its G20 surveillance note released ahead of the G20 finance ministers and central bank governors' meetings on March 17 and 18 in Germany.Outlook has improved in advanced economies, although their growth prospects in the medium-term remain subdued. They will continue to suffer from global financial crisis legacies, such as high corporate debts and low productivity growth, said the IMF.Emerging economies remain the main driver of the strengthening global outlook, as they continue to contribute more than three-quarters of total global GDP growth in 2017.According to IMF's World Economic Outlook report released in January, the global economy is expected to grow 3.4 percent in 2017 and 3.6 percent in 2018, up from 3.1 percent in 2016.Christine Lagarde, managing director of the IMF, said Tuesday in an IMF blog that the global economy has reached a turning point at least for now.The IMF also warned of the risks of inward-looking policies which could disrupt global trade and a sharp tightening in global financial conditions.A stronger U.S. dollar and rising U.S. interest rates could lead to a sharper-than-expected tightening in global financial conditions, which could potentially put stress on some emerging economies and low-income countries, said Lagarde.In order to sustain the growth momentum, IMF called on G20 members to uphold rules-oriented open multilateral trade framework, complete international financial regulatory reform and strengthen the international financial architecture.Lagarde also called for measures to boost inclusive growth, including training lower-skilled workers and retooling of income policies and tax systems.

15 MAR 2018

China to match export quality for domestic market products China will intensify efforts to improve product quality for domestic consumption so they match the same standards and quality of those for export, Sun Dawei, head of China's Certification and Accreditation Administration, said at a news conference on Tuesday.Sun said 1,180 export enterprises in China are now producing products for domestic consumption with the same standards and using the same production line as those for export, covering 5,000 different kinds of products. More products are expected to be included in efforts to improve quality for domestic consumption, he said.Enterprises that produce goods for export in China have been adopting different standards and production lines so the products meet the requirement of export destinations.More than 99 percent of food China exported met standards, according to the General Administration of Quality Supervision.

15 MAR 2017