The tube holds the leads in place ( with a small gap between the contacts for normally open switches ) 玻璃管将导线固定在位置上（对于常开开关，触点之间有一个小的气隙） 。
According to the state of the contact points , they are sorted into open type , closed type and combined type 根据触电状态的不同，继电器被分为常开型，常闭型和开闭混合型。
We , thinking that the school should be the second home to students , always keep the premises open 一我校校门常开，学校是学生的第二个家，提供他们一个愉快、舒适的学习环境。
Analog quantity output dc 420 ma , load resistance 500 relay output max ac 250 v , 3a 1a contact when resistive load 开关量输出输出一对无源常开触点开关报警时闭合，触点动作同步
The alarm can be set to 5 states : always open , always open locked , always closed , always closed locked and forbidden 有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
In this diagram , a single - pole normally open relay is controlling the connecction of the voltage source to the lamp 在该图中，一个单刀常开继电器控制着电压源和照明灯之间的连接。
An isolated relay can have more than one pole and can have normally closed contacts as well as normally open contacts 隔离继电器可以有多个铡刀，可以有常闭触点，也可以有常开触点。
Small carvings of the buddha , attorney lu tail , ears droop , as a blessing to startle , beaming , secure a safety belt around 巧雕的小佛，袒胸露腹，双耳下垂，福像横生，笑口常开，憨态可掬。
The contact functions normally open normally closed and the contact types p - switching n - switching are available as optional extras 接点功能常开常闭和接点类型p型开关n型开关都可供选择。
Support door emergency alarm input to setup as “ normally close ” ( nc ) or “ normally open ” ( no ) connection . default is set as no 支持门的报警点输入有”常开”和”常闭”的设置.默认设置为”常开”
