Siemens is a German multinational company, ranked 77th on the 2018 Fortune Global 500 list, and is known for its electronic and electrical products, which are commonly used in energy, healthcare, industrial, infrastructure and urban businesses.
 
Chinese consumers' impression of Siemens comes mostly from white goods, and Siemens is also a leader in the field of professional electrical appliances, and the earliest DC motors in China were provided by Siemens in the early 20th century. In 2014, Siemens sold a 50% stake in its joint venture BSH and completely withdrew from the home appliance field, and in the future, Siemens will focus more on industrial, energy, medical and other businesses.
 
As one of the world's leading suppliers of power distribution products, Siemens has a full range of medium and low voltage power distribution products, which can provide reliable, efficient and stable solutions for power supply in various scenarios. At the 10th Shanghai International Electric Power and Electrical Engineering Exhibition, Siemens showcased the state-of-the-art vacuum circuit breaker 3AE-SION and the medium-voltage gas-insulated switchgear with unipolar metal enclosure, whose technical strength has left many manufacturers in the dust.
 
In the field of low-voltage electrical components, Siemens is second only to Schneider and ABB, but its sales and profit margins have always been inferior to the latter two. The main reason is that low-voltage electrical products account for a small share of Siemens' business, the types of components are not as comprehensive as Schneider and ABB, and Siemens' market coverage is insufficient, and the office only radiates to the first-class cities, and the second-level counties and cities basically have no outlets. However, with its century-old brand name and German technology, Siemens has guaranteed quality and performance, and both industry insiders and decoration novices have recognized its industry status.
 
Circuit breakers are an important product of Siemens' largest group, Siemens Industry Automation & Drive Technology Group, including compact circuit breakers, miniature circuit breakers, molded case circuit breakers and frame circuit breakers, of which the first two are mainly used in ordinary households. Household circuit breakers are not only important for safety, but also not too large. Siemens is one of the first manufacturers in the industry to introduce the compact circuit breaker, and its 1P N compact circuit breaker is only half the volume of ordinary circuit breakers, which greatly saves extremely valuable space in the distribution box. In addition, Siemens is one of the drafting units of the EN (European Standard) and IEC (International Electrotechnical Commission) standards for circuit breakers.
 
The main series of Siemens' circuit breakers is called 5SJ, which is divided into air switch and leakage protection switch, the former has overload and short circuit protection functions, and the latter has more leakage protection functions and is mostly used as a master switch. Siemens' circuit breakers have a short-circuit breaking capacity of up to 6 kA and an ultimate short-circuit breaking capacity of up to 30 kA, and an electrical/mechanical life of 10,000 and 20,000 times, respectively, all of which are at the top level. There are a total of 13 arc extinguishing grids inside the circuit breaker, far exceeding the 9 required by the national standard, and the arc extinguishing speed is faster, which greatly improves the safety. The energy-saving performance of 5SJ has also been in the leading position in the industry, the heat loss power is controlled between 1/3-1/2 of the national standard specified value, and the 16A air switch commonly used at home can save about 60 degrees of electricity a year.
 
In some details, 5SJ also shows high quality, the handle is very light when the handle is pulled upward, and the entire terminal ferrule is made of thick copper, which is obviously different from the similar products of Delixi and Chint of domestic first-line manufacturers. As an international first-line manufacturer second only to Schneider and ABB, its price is not cheap, the price of 1P16A air switch is about 23 yuan, which is about 2 times that of domestic brands, but it is a little cheaper than Schneider and ABB.