触点熔焊是汽车继电器最为严重的故障，它可能导致汽车事故。
Contact welding of automotive relay is the worst failure and may result in serious car accident.
有SF 6气体密度继电器，并能事故报警，及闭锁操作机构。
It shall have SF6 gas density relay and emergency alarm as well as blocking operating mechanism.
常见的电梯门锁安全电路中，门锁继电器在多种情况下都可能产生误动作，存在事故隐患。
Based on discussion on several common elevator door lock circuits with software, this paper points out some hidden peril of the accident in such circuits, and designs a circuit using PLC.
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