Circuit breaker with detachable tripping tester
First Claim
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1. A circuit breaker for breaking a connection in an AC power line comprising:
- a housing;
a rectifying circuit coupled to said AC power line for producing a DC voltage at a positive output terminal thereof;
an electric power source connected to said positive output terminal and provided in said housing, said electric power source having a negative terminal and a positive terminal;
a first breaker terminal and a second breaker terminal provided on a surface of said housing, said first breaker terminal being connected to said negative terminal of said electric power source;
a diode having its anode connected to said second breaker terminal and its cathode connected to said positive output terminal of said rectifying circuit;
a tripping coil and a first switch connected in series between said negative and positive terminals;
a quasi over-current signal generating means connected to said second breaker terminal for closing said switch in response to a predetermined DC voltage signal being applied to said second terminal; and
a tripping tester havinga first tester terminal which is detachable from and attachable to said first breaker terminal,a second tester terminal which is detachable from and attachable to said second breaker terminal, anda DC power source and a tester switch connected in series between said first and second tester terminals.
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Abstract
In a circuit breaker having an instant time tripping test function, terminals which are connected to an electric power source of a control circuit of the circuit breaker and a quasi over-current signal generating circuit for tripping test are provided on a front face of a housing of the circuit breaker, and a widely usable detachable tripping tester comprising a D.C. power source and a switch is connected to the terminals, thereby a predetermined voltage is applied to the electric power circuit and the quasi over-current signal generating circuit for testing a tripping mechanism.
9 Citations
2 Claims
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1. A circuit breaker for breaking a connection in an AC power line comprising:
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a housing; a rectifying circuit coupled to said AC power line for producing a DC voltage at a positive output terminal thereof; an electric power source connected to said positive output terminal and provided in said housing, said electric power source having a negative terminal and a positive terminal; a first breaker terminal and a second breaker terminal provided on a surface of said housing, said first breaker terminal being connected to said negative terminal of said electric power source; a diode having its anode connected to said second breaker terminal and its cathode connected to said positive output terminal of said rectifying circuit; a tripping coil and a first switch connected in series between said negative and positive terminals; a quasi over-current signal generating means connected to said second breaker terminal for closing said switch in response to a predetermined DC voltage signal being applied to said second terminal; and a tripping tester having a first tester terminal which is detachable from and attachable to said first breaker terminal, a second tester terminal which is detachable from and attachable to said second breaker terminal, and a DC power source and a tester switch connected in series between said first and second tester terminals. - View Dependent Claims (2)
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Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsIshii, Kazuhiro, Hirotsune, Kouji
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Primary Examiner(s)Stephan, Steven L.
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Assistant Examiner(s)Dougherty, Thomas M.
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Application NumberUS07/659,684Time in Patent Office666 DaysField of Search361/94, 361/92, 361/96US Class Current361/94CPC Class CodesH02H 3/044 Checking correct functionin...
