据不完全统计，目前全国生产开关的中小企业已达4000多家，产品远远供大于求。市场的变化导致竞争越来越激烈，在感受民营企业竞争所带来的压力的同时，国外一些大的跨国公司（如ABB、西门子、三菱公司等）也向中国市场“急行军”，外资企业成为主要竞争对手，使市场份额由过去 According to incomplete statistics, there are currently more than 4,000 small and medium-sized enterprises that produce switches all over the country and their products are far exceeding supply. Changes in the market have led to increasingly fierce competition. While experiencing the pressure brought about by the competition of private enterprises, some large foreign multinational companies (such as ABB, Siemens, Mitsubishi, etc.) have also made “urgent marches” to the Chinese market, and foreign-funded enterprises have become Major competitors make market share from the past