Alphasem AS262-0-02 AS261-0-02 AS309-1-03

Description

Alphasem AS262-0-02 AS261-0-02 AS309-1-03

用于保护大型电机系统的过载是一种继电器，这种继电器在PLC技术中的使用并没有减少。也许逆变器(VFD)的兴起是其受欢迎程度下降的原因，但你肯定会遇到许多过载继电器。

这些也可以被称为热继电器，但大多数过载(您会看到它们在原理图上列为OL)包含以下组合磁性和热过载部件。如果电机电流过大(电机浪涌电流过大)，磁性部件会立即断开电路。热元件反应和断开电路的时间稍长，因此它用于防止稳态电流上升(过载电流过大或FLA)。

Alphasem AS262-0-02 AS261-0-02 AS309-1-03

Overload protection for large motor systems is a type of relay, and its use in PLC technology has not been reduced. Perhaps the rise of inverters (VFDs) is the reason for their declining popularity, but you will definitely encounter many overload relays.

These can also be referred to as thermal relays, but most overloads (you will see them listed as OL on the schematic) include the following combination of magnetic and thermal overload components. If the motor current is too high (motor surge current is too high), the magnetic components will immediately disconnect the circuit. The reaction and disconnection time of the thermal element is slightly longer, so it is used to prevent the steady-state current from rising (excessive overload current or FLA).