是一个机械
当处于打开位置时，执行断开操作的开关装置
功能，并确保隔离距离（触点之间的距离）足以保证安全。必须保证这种断开的安全性，并且
通过正向操作验证：操纵杆必须始终指示
设备移动触点的实际位置。
机械开关装置必须能够接通、携带和断开电流
在正常电路条件下，包括正常服务中的任何过载电流，
并在规定的时间内，在异常电路条件下承载电流，
例如，短路条件。
隔离开关通常用于：
•主配电盘装置；
•线路、母线或负荷装置的开关和断开装置；
•总线连接。
隔离开关应确保整个装置或其部分不受影响
带电、安全地断开与任何电源的连接。这种开关的使用
例如，隔离开关允许人员在工厂上执行工作
没有电气性质的风险。
即使不禁止并排使用单极装置
标准建议使用多极装置，以保证
同时隔离电路中的所有极。
隔离开关的特定额定特性由
标准IEC 60947-3，详情如下：
•Icw[kA]：额定短时耐受电流：
是指开关能够在没有损坏的情况下在
特定持续时间的关闭位置

is a mechanical switching device which, when in the open position, carries out a disconnecting function and ensures an isolating distance (distance between contacts) sufficient to guarantee safety. This safety of disconnection must be guaranteed and verified by the positive operation: the operating lever must always indicate the actual position of the mobile contacts of the device. The mechanical switching device must be able to make, carry and break currents in normal circuit conditions, including any overload currents in normal service, and to carry, for a specified duration, currents in abnormal circuit conditions, such as, for example, short-circuit conditions. Switch disconnectors are often used as: • main sub-switchboard devices; • switching and disconnecting devices for lines, busbars or load units; • bus-tie. The switch disconnector shall ensure that the whole plant or part of it is not live, safely disconnecting from any electrical supply. The use of such a switch disconnector allows, for example, personnel to carry out work on the plant without risks of electrical nature. Even if the use of a single pole devices side by side is not forbidden, the standards recommend the use of multi-pole devices so as to guarantee the simultaneous isolation of all poles in the circuit. The specific rated characteristics of switch disconnectors are defined by the standard IEC 60947-3, as detailed below: • Icw [kA]: rated short-time withstand current: is the current that a switch is capable of carrying, without damage, in the closed position for a specific duration