Normally Open A contact pair that is open when the relay is not energized. 在继电器未受激励时保持闭合的触点对。
KTS011: Thermostat ( normally open), contact maker for regulating of filter fans and heat exchangers or for switching signal devised when temperature limit hasbeen exceed. 温控器(常开),当温度超出设定值时开关装置可以启动风机或信号装置。