| Standard ID | SJ 1263-1977 (SJ1263-1977) |
| Description (Translated English) | XED/XCD-type C-cores for single-phase transformers |
| Sector / Industry | Electronics Industry Standard |
| Classification of Chinese Standard | L17 |
| Word Count Estimation | 24,228 |
| Date of Issue | 1978/6/1 |
| Date of Implementation | 1978/6/1 |
| Regulation (derived from) | Industry-Science (2010) No. 77 |
| Summary | This standard applies to electronic equipment transformers, overcast asthenosphere, etc. with C-shaped core (hereinafter referred to as the core), the core made of cold-rolled silicon steel strip. The use of such a copper core with saving features. |