为防止因冲击电压造成过电压损坏，通常需要在变频器的输入端加压敏电阻等吸收器件，保证输入电压不高于变频器主回路期间所允许的最大电压。当使用真空断路器时，应尽量采用冲击形成追加RC浪涌吸收器。若变压器一次侧有真空断路器，因在控制时序上保证真空断路器动作前先将变频器断开。
过去的晶体管变频器主要有以下缺点：容易跳闸、不容易再起动、过负载能力低。由于IGBT及CPU的迅速发展，变频器内部增加了完善的自诊断及故障防范功能，大幅度提高了变频器的可靠性。
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