JPH03117327U

JPH03117327U -

Info

Publication number: JPH03117327U
Application number: JP2445090U
Authority: JP
Priority date: 1990-03-13
Filing date: 1990-03-13
Publication date: 1991-12-04

Description

[Brief explanation of drawings]

第１図、第２図はこの考案の一実施例の要部を
示すそれぞれブロツク図、回路図、第３図はこの
考案の動作説明用波形図、第４図、第５図は他の
実施例の要部を示すそれぞれブロツク図、回路図
、第６図は従来の事前警報付回路遮断器を一部回
路図で示すブロツク図、第７図は従来の事前警報
付回路遮断器の特性曲線図である。図において、１……交流電源、２……負荷、３
Ａ……事前警報付回路遮断器、５……主回路、２
０……事前警報回路、２２Ａと２２Ｂ……事前警
報出力回路、３０……切換スイツチ、ａ……自動
復帰用固定接点、ｂ……自己保持用固定接点、ｃ
……可動接点、３１……リセツトボタン、ＳＤ１
……第１半導体素子としてのトランジスタ、ＳＤ
２……第２半導体素子としてのサイリスタ、ＳＤ
２−１，ＳＤ２−２……第２半導体素子としての
それぞれダイオード接続されたトランジスタ、並
列接続されたトランジスタである。尚、各図中、
同一符号は同一または相当部分を示す。 Figures 1 and 2 are block diagrams and circuit diagrams showing essential parts of an embodiment of this invention, Figure 3 is a waveform diagram for explaining the operation of this invention, and Figures 4 and 5 are diagrams showing other embodiments. Figure 6 is a block diagram and circuit diagram showing the main parts of an example. Figure 6 is a block diagram showing a partial circuit diagram of a conventional circuit breaker with advance warning. Figure 7 is a characteristic curve of a conventional circuit breaker with advance warning. It is a diagram. In the figure, 1... AC power supply, 2... Load, 3
A...Circuit breaker with advance warning, 5...Main circuit, 2
0... Advance warning circuit, 22A and 22B... Advance warning output circuit, 30... Changeover switch, a... Fixed contact for automatic return, b... Fixed contact for self-holding, c
...Movable contact, 31...Reset button, SD1
...Transistor as the first semiconductor element, SD
2... Thyristor as a second semiconductor element, SD
2-1, SD2-2 . . . diode-connected transistors and parallel-connected transistors as second semiconductor elements. In addition, in each figure,
The same reference numerals indicate the same or equivalent parts.

Claims

[Claims for Utility Model Registration] Overcurrent tripping characteristics for detecting an overcurrent flowing in a main circuit between an AC power source and a load and interrupting the main circuit, and detecting the current before the overcurrent occurs. A circuit breaker with an advance warning that has advance warning characteristics for issuing a warning in advance, including a changeover switch that has an automatic return position and a self-holding position for advance warning, and a case where the changeover switch is in the automatic return position. is turned on/off by a detection signal proportional to the current.
a first semiconductor element that is turned off; and a first semiconductor element that is electrically connected to the first semiconductor element and that self-holds the advance warning when the changeover switch is in the self-holding position or causes the first semiconductor element to self-hold. an advance warning output circuit having a second semiconductor element for causing the self-maintained advance warning to be activated; and an advance warning output circuit provided between both ends of the second semiconductor element to short-circuit the second semiconductor element when activated. A circuit breaker with advance warning, characterized in that it is equipped with a reset means for resetting the circuit breaker.