一、适用范围 Sphere of application   BK系列控制变压器适用50~60HZ电压至500V的电路中，通常用作机床和机床设备中一般电器的控制电源，或局部照明灯及指示灯的电源之用。   BK series control transformer for 50~60Hz voltage to 500V circuits machine tools and mechanical equipment commonly used in the general control of electric power, or local lighting and power indicator light purposes.二、使用环境 Working condition2、1 周围空气温度-5℃至+40℃，24小℃时的平均值不超过+35%；2、2 安装地点海拔不超过2000m,2、3 大气相对湿度在周围空气温度为+40℃时不超过50%，在较低温度下可以有较高的相对湿度，最湿月的平均相对湿度为90%，同时该月的平均最低温度为+25℃，2、1 The ambient air temperature of -5℃ to +40℃,24-hour average does not exceed+35℃；2、2 Installation site altitude does not exceed 2000m;2、3 The atmospheric relative humidity in the ambient air temperature is +40 ℃ less than 50%, at a lower temperature can have a higher relative humidity,the average maximum humidity of 90%,while the monthly average minimum monthly temperature to +25℃.三、结构特点 Structure   BK系列控制变压器是经过多年来进一步国内外同类产品的优点，采用先进工艺和严谨设计进行制造，并优选国外先进方法的接线端子，具有性能优良、工作可靠、耗能低、体积小、接线安全、防护等级高、适用性广等特点。在额定负载下能长期工作，是一种理想的变压电源。  BK series control transformer is the result of similar at home and abroad for many years to further absorb the advantages of using advanced manufacturing techniques design,and advanced optimization methods terminals,with excellent performance, reliable operation, low power consumption, small size,wiring security, protection levvel high, wide applicability and so on. Rated load in the long-term work is an ideal transformer power supply.