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2. 发明授权

US5831501A Adjustable trip unit and circuit breaker incorporating same 失效
标题翻译：可调节跳闸单元和合并其的断路器
公开(公告)号：US5831501A
公开(公告)日：1998-11-03
申请号：US840158
申请日：1997-04-14
申请人： Kenneth D. Kolberg , David A. Parks , Kimberley Morris
发明人： Kenneth D. Kolberg , David A. Parks , Kimberley Morris
IPC分类号： H01H71/74 , H01H75/10
CPC分类号： H01H71/7463
摘要： A solenoid type magnetic trip assembly for a molded case circuit breaker includes an armature biased against an adjustable stop by a tension spring to set the initial gap for the magnetic trip, so that the spring bias remains constant for the full range of the initial gap. The armature includes an elongated armature element mounted by a frame to slide longitudinally along a pair of guide rails. The frame defines a trip surface axially aligned with the elongated armature element which engages a trip arm on a trip bar to trip the circuit breaker in response to a predetermined level of overcurrent. A bimetal providing a thermal trip function is cantilevered from a support spaced from the trip bar by the armature, but has a terminal portion at the free end projecting toward the trip bar and through which the elongated armature element of the armature extends. A radially enlarged slug on the free end of the elongated armature element of the armature is subjected to a magnetic force opposite to the force generated by load current tending to pull the armature into the solenoid coil. This opposing force increases as the initial gap increases, placing the slug closer to the magnetic frame, so that a greater range of trip currents can be selected despite limited room for armature travel. A gap in the magnetic frame prevents short circuiting the magnetic field where the few turns of a large gauge coil wire produce an unsymmetrical winding. A magnetic shield protects the bimetal from deformation during high current short circuits. A non-magnetic spring clip firmly retains the magnetic frame in a recess in the circuit breaker housing.
摘要翻译：用于模制外壳断路器的螺线管型磁跳闸组件包括通过拉伸弹簧偏压抵靠可调节止动件的电枢，以设定磁跳闸的初始间隙，使得弹簧偏置在初始间隙的全部范围内保持恒定。电枢包括由框架安装的细长电枢元件，以沿着一对导轨纵向滑动。框架限定了与细长电枢元件轴向对准的跳闸表面，其接合跳闸杆上的跳闸臂，以响应于预定水平的过电流来跳闸断路器。提供热脱扣功能的双金属从电枢与跳闸杆间隔开的支撑件悬臂，但是在自由端具有朝向跳闸杆突出的端子部分，衔铁的细长电枢元件通过该端子部延伸。在电枢的细长电枢元件的自由端上的径向扩大的块状物受到与由负载电流产生的力相反的磁力，倾向于将电枢拉入螺线管线圈。这种相反的力随着初始间隙的增加而增加，将芯块放置在更靠近磁性框架的位置，这样就可以选择更大范围的跳闸电流，尽管电枢行程有限。磁性框架中的间隙防止了大规格线圈线的几匝产生不对称绕组的磁场的短路。磁屏蔽保护双金属在高电流短路期间不会变形。非磁性弹簧夹牢固地将磁性框架保持在断路器壳体的凹部中。

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