本标准规范适用于重型和轻型3针连接器（如标题所示）的制造，并规定了互换性和电气安全的尺寸、结构要求和试验。

This standard specification applies to the manufacture of heavy-duty and light-duty 3-pin connectors (as title) and specifies dimensions, constructional requirements and tests for interchangeability and electric safety.