| 摘要 |
In the case of a screw cap for melting-fuse cartridges having a viewing opening incorporated in the end surface and having an internal contact link, a glow lamp (24) is incorporated in the end surface outside the viewing opening (21), is conductively connected to a test contact (23) which is accessible from the outside and is connected to the contact link (20) via a high-impedance resistor (25). <IMAGE>
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