Mercury Wetted Relay. A reed relay in which the contacts are wetted by a film of mercury. Usually has a required position for proper operation; some types are position insensitive.

• 水银湿簧继电器一种簧片继电器，触点由水银膜湿润。通常需要正确定位才能正常工作。有些类型对位置并不敏感。