急始 meaning in English

sudden commencement

These three products are specialized diodes designed for specific purposes and their names give an indication of their use ? however these are diodes which serve to protect the circuit from transient or sudden ( surge ) voltage changes or for constant current diodes , to keep the current constant
此三种产品是专门用来（名称已经表明其用途）保护电路不受瞬变电压、急始(浪涌)电压变化的影响，或保持恒定电流二极管的电流稳定。