Instantaneous trip mechanism for molded case circuit breakers
A technology of tripping mechanism and circuit breaker, which is applied to the protection switch operation/release mechanism, circuit, and parts of the protection switch, etc., can solve the problems of prolonged operation time and increased damage of power circuit molded case circuit breakers.
Active Publication Date: 2019-03-22
LSIS CO LTD
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Problems solved by technology
[0006] However, in the related art instantaneous trip mechanism disclosed in those patent documents, when the electromagnet performs magnetic attraction at the position farthest from the armature (as the basic operating position) in response to the fault current, unlike when the electromagnet Excessively extended operating times compared to operations performed at the minimum set position with the shortest distance between the armatures, which leads to increased damage to power circuits, electrical loads and molded case circuit breakers
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[0033] The above aspects of the present invention, the construction of the present invention and the operational effects of the construction will be more clearly understood from the following description of preferred embodiments of the present invention with reference to the accompanying drawings.
[0034] figure 1 is a partially cutaway perspective view showing the appearance and internal configuration of the molded case circuit breaker 100 in the ON state.
[0035] Such as figure 1 As shown, a molded case circuit breaker 100 includes an upper cover 10 and a lower case forming part of an enclosure.
[0036] exist figure 1 In the partially cutaway portion of , seen are an adjustment dial 31 , a momentary lever 32 and a trip lever 40 that may be included in an instantaneous trip mechanism. exist figure 1 The central portion shows the setting in the ON state and is contained in the switch mechanism 50 (see Figure 4 ) in the operating handle (reference number not shown), wh...
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The present invention provides an instantaneous trip mechanism for a molded case circuit breaker, the mechanism comprising: an adjusting dial, which sets the current for performing an instantaneous tripping operation; an instantaneous lever, which is provided with a The upper part of the upper part, the shaft part serving as the rotation shaft and the lower extension part extending downward from the shaft part; the electromagnet unit, which generates a magnetic attraction force proportional to the amount of current flowing on the circuit; The lower end of the shaft support rotates and is attracted toward the electromagnet unit by a magnetic attraction force; and a spring that applies a load to the armature that varies in a direction in which the armature moves away from the electromagnet unit.
Description
technical field [0001] The present disclosure relates to a molded case circuit breaker, and more particularly, to an instantaneous trip mechanism for a molded case circuit breaker capable of shortening a fault current interruption time. Background technique [0002] The instantaneous trip mechanism for molded case circuit breakers is a device for instantaneously detecting a fault current on a power circuit (such as a short-circuit current that is tens to hundreds of times larger than the rated current) and triggers the switching mechanism to perform Device for tripping operation. [0003] The following documents, which have been applied by the present applicant, can be considered as related art of the instantaneous trip mechanism. [0004] [Patent Document 1] KR10-0928936 B1 [0005] [Patent Document 2] KR10-1026306 B1 [0006] However, in the related art instantaneous trip mechanism disclosed in those patent documents, when the electromagnet performs magnetic attraction ...
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IPC IPC(8): H01H71/24
CPCH01H71/24H01H71/74H01H71/7463H01H71/025H01H71/04H01H71/08H01H71/2409
Inventor 吴基焕
Owner LSIS CO LTD