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ข้อมูลไฟฟ้าน่ารู้, อุปกรณ์ไฟฟ้าอื่นๆ- The ensured a steady and secure breaking potential whatever the working voltage by means of an open Procedure employing a independent breaking spring.– Mỗi pha được đúc và đóng riêng để cải thiện khả năng ngắt và tăn