Circuit breaker with calibration point unauthorized change display means |
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| 申请号 | JP21165091 | 申请日 | 1991-07-29 | 公开(公告)号 | JPH04233117A | 公开(公告)日 | 1992-08-21 |
| 申请人 |
Westinghouse Electric Corp |
发明人 | SUTEIIBUN ARUBAATO MURENA; | ||||
| 摘要 | PURPOSE: To provide a circuit breaker capable of making calibration after the final assembly is completed and leaving evidence of an unauthorized change of a calibration point. CONSTITUTION: A circuit breaker has an opening 115 for calibration in the flat wall of a housing and a supporting plate 19 extending along the wall within a housing cavity. The opening for calibration is formed in the position falling in line with a lateral direction slot 105 in the supporting plate, and the circuit breaker is calibrated by inserting a tool into the opening and rotating the free end of the supporting plate to which a bimetal 61 is fixed. A film 119 colored in contrast with the housing and capable of breaking is fixed to the opening for calibration with an adhesive 121, and coated with paint matching the color of the housing. When a transparent layer 123 stuck to the film is peeled off from the film, paint is peeled off together with layer 123, and in the case that a thermal trip setting point is illicitly changed, color of the film is exposed to leave the evidence of the unfair change. COPYRIGHT: (C)1992,JPO |
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| 权利要求 | |||||||
| 说明书全文 | |||||||
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