Increase external overload protection is to prevent motor burned effective means, such as thermal relay protection.
增加外部过载保护是防止电机烧毁的有效手段，如热继电器保护。
The thermal overload relay is a kind of low-voltage protection apparatuses which is widely used in the field of motor protection.
热过载继电器是一种重要的低压保护类电器，广泛应用于电动机的保护领域。
IC type overload protection circuit has gradually replaced thermal relay overload protection mode.
煤电钻采用热继电器进行过载保护方式已逐渐被IC型过载保护电路取代。
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