以下为句子列表：
英文: Based on the mechanism of hot cracking formation of castings, the cracking defects of furnace door frame castings was analyzed, and found that the main reasons causing cracking are as follows: construction of the casting was not reasonable, gating system
中文: 摘要根据铸件产生热裂纹的机理，对炉门框裂纹缺陷进行分析，找到了裂纹产生的主要原因是铸件结构和浇注系统不合理，以及浇注温度过高。
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英文: Fixed to the door frame of cubicle provide degree of protection IP54. It is suitable for draw out type and type circuit breakers.
中文: 安置在柜体小室的门框上，防护等级达到IP54。适用于抽屉式及固定式断路器。
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