ABB

 ABB Group, headquartered in Zurich, Switzerland, is one of the top 500 companies. ABB was formed in 1988 by the merger of Sweden's ASEA and Switzerland's BBC Brown Boveri, two international companies with a history of more than 100 years. The two companies were founded in 1883 and 1891 respectively. ABB is a leader in the power and automation technology domain. ABB's technologies can help power, utility and industrial customers improve their performance while reducing their environmental impact. The ABB Group operates in more than 100 countries, employs 130,000 people and generated sales of $32 billion in 2010. ABB frequency converter is a brand of frequency converter developed, produced and sold by ABB Group.