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    • 13. 发明授权
    • Variable thermal and magnetic structure for a circuitbreaker trip unit
    • 用于断路器跳闸单元的可变热和磁结构
    • US5872495A
    • 1999-02-16
    • US988060
    • 1997-12-10
    • Bernard DiMarcoJames E. FerreeRobert E. Black
    • Bernard DiMarcoJames E. FerreeRobert E. Black
    • H01H71/16H01H71/40H01H71/74H01H75/12
    • H01H71/405H01H71/164H01H71/7409H01H71/7463H01H2071/749
    • A thermal and magnetic trip unit for a multi-pole circuit breaker includes a thermal structure having a bimetallic element and one or more heater elements. Each of the heater elements and a portion of the bimetallic element is generally "U" shaped defining a conductive path which extends from one leg of the U to the other leg. The heater elements and bimetallic element may be configured in parallel to reduce the level of current flowing through the bimetallic element and thus increase the current level at which the bimetallic element will trip the breaker. Alternatively, the heater elements may be configured in series with the bimetallic element, by inserting electrical insulators between the bimetallic element and each of the heater elements and connecting the various "U" shaped elements using a connecting bus which connects the second leg of one element to the first leg of the next element. In this configuration, the thermal structure defines a coil having one turns for each heater element and the bimetallic element. This coil may be used to implement a magnetic trip structure by inserting one or two magnetically permeable yokes, each yoke surrounding one leg of the combined thermal structure. An armature is positioned to be separated from the yoke by a gap such that, when the armature is pulled toward the yoke, it will engage the trip unit. In addition, the trip unit includes a calibration and adjustment bar that allows the gap to be adjusted as well as the force exerted on the armature by a biasing spring. The calibration and adjustment bar also allows each pole of the circuit breaker to be independently calibrated.
    • 用于多极断路器的热和磁跳闸单元包括具有双金属元件和一个或多个加热元件的热​​结构。 每个加热器元件和双金属元件的一部分通常为“U”形,限定从U的一条腿延伸到另一条腿的导电路径。 加热器元件和双金属元件可以被并联配置以减小流过双金属元件的电流的水平,并因此增加双金属元件将使断路器跳闸的电流水平。 或者,可以通过在双金属元件和每个加热器元件之间插入电绝缘体并且使用连接总线连接各种“U”形元件来将加热元件与双金属元件串联配置,该连接总线连接一个元件的第二支脚 到下一个元素的第一条腿。 在该结构中,热结构限定了每个加热元件和双金属元件具有一匝的线圈。 该线圈可以用于通过插入一个或两个磁性可渗透的轭来实现磁脱扣结构,每个轭围绕组合的热结构的一条腿。 电枢被定位成通过间隙与轭分离,使得当电枢被拉向轭时,电枢将接合跳闸单元。 此外,跳闸单元包括校准和调节杆,其允许调节间隙以及由偏置弹簧施加在电枢上的力。 校准和调整杆还允许断路器的每个极独立校准。