过流保护背示灯 Overcurrent protection backlight (indicator) Guò liú bǎohù bèi shìdēng 恒流指示灯 Constant current indicator héng liú zhǐshì dēng 恒压指示灯 Constant voltage indicator héng yā zhǐshì dēng https://www.ntmobile.vn/nguon-5a-qj3005t 3005 mean 30v 5A