可能厂家认为用户不会同时使用，就没有设置互锁功能。
Manufacturers think that the user may not used simultaneously, there is no set interlocking function.
多项安全互锁功能，以保护操作者免受活动部件的伤害；
With multiple security interlocks functions, it is possible to protect the operator from being injured by moving parts.
该电路不但降低了功率损耗，还具有短路保护和互锁保护等电路保护功能。
The circuit has many functions of protection, such as short circuit protection and interlocked protection.
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