它的主要作用是使線路通暢，使電纜保持密封，并保證電纜接頭處的絕緣等級，使其安全可靠的運行。若是密封不良，不僅會漏油造成油浸紙干枯，而且潮氣也會侵入電纜內部，使紙絕緣性能下。

根據電纜線路中間連接方式的不同，電纜的中間接頭也各不相同，6ES5760-0AB11終端插頭備件兩根絕緣材料相同、結構也相同的電纜的連接稱為直通式接頭；兩根絕緣材料不同或截面積不同的電纜連接稱為過渡接頭；在有些情況下，將三芯電纜與三根單芯電纜相互連接起來，這種接頭稱為轉換接頭；將一路送來的電源分幾路送出去，這種連接干線電纜與分支電纜的接頭稱為分支接頭；當支線電纜與干線電纜近乎垂直的接頭稱T型分支接頭近乎平行的接頭稱Y型分支接頭；在干線電纜某處同時分出兩根分支電纜，稱X型分支電纜。用于大長度電纜線路中，使接頭兩端電纜的金屬護套或金屬屏蔽層及半導電層斷開，以便交叉互連，減少互層（或屏蔽層）損耗，這種接頭稱絕緣接頭。

用于聚氯乙烯絕緣電纜、交聯聚乙烯和橡皮絕緣電纜的中間接頭和終端頭有橡膠自黏帶、6ES5760-0AB11終端插頭備件塑料膠黏帶繞包成型的繞包式電纜附件；應用高分子材料，具有“彈性記憶”的特點，將電纜附件各組成部分做成管材、手套等，再經交聯擴徑，現場安裝時加熱收縮成型，這類電纜附件稱為熱收縮電纜附件；利用彈性體材料將電纜附件絕緣和應力控制層在工廠內成型硫化，再擴徑填充襯墊，現場安裝時抽出襯墊，彈性體材料就壓緊在經過處理的末端或接頭處，這類電纜附件稱為冷收縮電纜附件；利用熱固化樹脂現場澆筑成型為澆筑式電纜附件；利用與電纜絕緣相同或相近的塑料薄模帶材現場繞包再加壓、加熱成型的稱為膜塑式電纜附件。
6SN1123-1AA00-0AA1      6SN1123-1AA00-0BA1 6SN1124-1AB00-0HA1 6ES5267-8MA11 6ES5725-2AC01 6ES5895-0BS11
6SN1123-1AB00-0AA1    6SN1123-1AB00-0BA1 6SN1123-1AB00-0CA0 6ES5315-8MA11 6ES5728-8MA11 6ES5848-6GC31
6SN1123-1AB00-0CA1    6SN1123-1AA00-0AA0 6SN1123-1AA00-0AA1 6ES5316-8FA12 6ES5735-8BB00 6ES5848-8CP01
6SN1123-1AA00-0AA1    6SN1123-1AA00-0AA2 6SN1123-1AA00-0AA2 6ES5316-8MA12 6ES5735-8BC50 6ES5848-8CP11
6SN1123-1AA00-0BA0    6SN1123-1AA00-0BA1 6SN1123-1AA00-0BA1 6ES5330-8MA11 6ES5782-8MA12 6ES5848-1CP01
6SN1123-1AA00-0BA2  6SN1123-1AA00-0BA2 6SN1123-1AA00-0CA0 6ES5375-0LC11 6ES5788-8MA11 6ES5848-6GC11
6SN1123-1AA00-0CA1    6SN1123-1AA00-0CA1 6SN1123-1AA00-0CA2 6ES5375-0LC21 6ES5788-8MK11 6ES5848-6GC21
6SN1123-1AA00-0CA2  6SN1123-1AA00-0DA0 6SN1123-1AA00-0DA0 6ES5375-8LA11 6ES5840-4SH01 6ES5835-8MD01
6SN1123-1AA00-0DA1  6SN1123-1AA00-0DA1 6SN1123-1AA00-0DA2 6ES5375-8LA12 6ES5840-6SG01 6ES5835-8MD21
6SN1123-1AA00-0DA1    6SN1123-1AA00-0EA0 6SN1123-1AA00-0EA0 6ES5375-8LC11 6ES5897-8QF01 6ES5835-8MD31
6SN1123-1AA00-0EA1    6SN1123-1AA00-0EA1 6SN1123-1AA00-0EA2 6ES5375-8LC21 6ES5930-8MD11 6ES5835-3SD11
6SN1123-1AA00-0EA1  6SN1123-1AA00-0FA0 6SN1123-1AA00-0GA0 6ES5380-8MA11 6ES5931-8MD11 6ES5835-3SD21
6SN1123-1AA00-0GA0    6SN1123-1AA00-0HA0 6SN1123-1AA00-0HA1 6ES5385-8MA11 6ES5935-8ME11 6ES5835-3SD31
6SN1123-1AA00-0HA1    6SN1123-1AA00-0HA2 6SN1123-1AA00-0HA2 6ES5385-8MB11 6ES5950-8MD11 6ES5760-0AB11
6SN1123-1AA00-0JA0    6SN1123-1AA00-0JA0 6SN1123-1AA00-0JA1 6ES5420-8MA11 6ES5980-0MA11 6ES5760-0HA11
6SN1123-1AA00-0JA1      6SN1123-1AA00-0KA0 6SN1123-1AA00-0KA0 6ES5421-8MA12 6ES5980-3BC41 6ES5760-1AA11
6SN1123-1AA00-0KA1    6SN1123-1AA00-0KA1 6SN1123-1AA00-0LA0 6ES5422-8MA11 6ES5980-3BC61 6ES5752-0AA62
6SN1123-1AA00-0LA0      6SN1123-1AA00-0LA1 6SN1123-1AA00-0LA1 6ES5430-8MB11 6ES5981-8MA11 6ES5758-1AA11
6SN1123-1AA00-0LA2    6SN1123-1AA00-0LA2 6SN1123-1AA00-0LA3 6ES5430-8MC11 6ES5981-8MB11 6ES5760-0AA11
6SN1123-1AA00-0LA3    6SN1123-1AA01-0FA0 6SN1123-1AA01-0FA0 6ES5430-8MD11 6ES5988-3NB11 6ES5752-0AA43
6SN1123-1AA01-0FA1    6SN1123-1AA01-0FA1 6SN1123-1AA02-0FA0 6ES5431-8FA11 6ES5988-3NB41 6ES5752-0AA52
6SN1123-1AA02-0FA0  6SN1123-1AA02-0FA1 6SN1123-1AA02-0FA1 6ES5431-8MA11 6ES5998-0CN11 6ES5752-0AA53
6SN1123-1AB00-0AA0    6SN1123-1AB00-0AA1 6SN1123-1AB00-0AA1 6ES5431-8MC11 6ES5988-3LB11 6ES5752-0AA12
6SN1123-1AB00-0AA2  6SN1123-1AB00-0AA2 6SN1123-1AB00-0BA0 6ES5431-8MD11 6ES5988-3LB21 6ES5752-0AA22
6SN1123-1AB00-0BA1 6SN1123-1AB00-0BA1 6SN1123-1AB00-0BA2 6ES5433-8MA11 6ES5988-3NA11 6ES5752-0AA23
6SN1123-1AB00-0BA2  6SN1123-1AB00-0CA0 6SN1123-1AB00-0CA0 6ES5437-8EA11 6ES5981-0FA41 6ES5750-2AB31
6SN1123-1AB00-0CA1    6SN1123-1AB00-0CA1 6SN1123-1AB00-0CA2 6ES5437-8EA12 6ES5982-4AA11 6ES5750-2AB41
6SN1123-1AB00-0CA2    6SN1123-1AB00-0CA3 6SN1123-1AB00-0CA2 6ES5440-8MA12 6ES5988-3LA11 6ES5750-2AB51
6SN1123-1AB00-0HA0    6SN1123-1AB00-0HA1 6SN1123-1AB00-0HA1 6ES5440-8MA22 6ES5981-0EA11 6ES5750-2AA51
6SN1123-1AB00-0HA2  6SN1123-1AB00-0HA2 6SN1124-1AB00-0HA2 6ES5441-8MA11 6ES5981-0EA41 6ES5750-2AB11
6SN1124-1AA00-0AA1    6SN1124-1AA00-0BA1 6SN1124-1AA00-0CA2 6ES5450-8FA11 6ES5981-0FA11 6ES5750-2AB21
6SN1124-1AA00-0DA1    6SN1124-1AA00-0EA1 6SN1124-1AA00-0FA1 6ES5450-8FA12 6ES5980-0DA11 6ES5750-2AA21
6SN1124-1AA00-0LA1  6SN1124-1AB00-0AA1 6SN1124-1AB00-0BA1 6ES5450-8MB11 6ES5980-0NC11 6ES5750-2AA31
6SN1124-1AB00-0CA1  6SN1124-1AA00-0AA0 6SN1124-1AA00-0AA1 6ES5450-8MD11 6ES5981-0DA11 6ES5750-2AA41
6SN1124-1AA00-0AA2  6SN1124-1AA00-0BA0 6SN1124-1AA00-0BA1 6ES5451-8MA11 6ES5955-7NC12 6ES5726-8BD20
6SN1124-1AA00-0BA2    6SN1124-1AA00-0CA0 6SN1124-1AA00-0CA1 6ES5451-8MD11 6ES5956-0AA12 6ES5726-8BF00
6SN1124-1AA00-0CA2    6SN1124-1AA00-0DA0 6SN1124-1AA00-0DA1 6ES5451-8MR11 6ES5958-4UA11 6ES5726-8CB00
6SN1124-1AA00-0DA2    6SN1124-1AA00-0EA0 6SN1124-1AA00-0EA1 6ES5451-8MR12 6ES5955-3NF41 6ES5726-4CB00
6SN1124-1AA00-0EA2  6SN1124-1AA00-0GA0 6SN1124-1AA00-0HA0 6ES5452-8MR11 6ES5955-3NF42 6ES5726-5BF00
6SN1124-1AA00-0HA1    6SN1124-1AA00-0HA2 6SN1124-1AA00-0JA0 6ES5453-8MA11 6ES5955-7NC11 6ES5726-5CB00
6SN1124-1AA00-0JA1    6SN1124-1AA00-0KA0 6SN1124-1AA00-0KA1 6ES5457-8EA11 6ES5955-3NC13 6ES5706-7BF01
6SN1124-1AA00-0LA1    6SN1124-1AA00-0LA2 6SN1124-1AA00-0LA3 6ES5457-8EA12 6ES5955-3NC41 6ES5706-7CB61
6SN1124-1AA01-0FA0    6SN1124-1AA01-0FA1 6SN1124-1AB00-0AA0 6ES5461-8MA11 6ES5955-3NC42 6ES5706-7CD21
6SN1124-1AB00-0AA1  6SN1124-1AB00-0AA2 6SN1124-1AB00-0BA0 6ES5464-8MA11 6ES5955-3LF42 6ES5706-8BF01
6SN1124-1AB00-0BA1    6SN1124-1AB00-0BA2 6SN1124-1AB00-0CA0 6ES5464-8MA21 6ES5955-3LF44 6ES5948-3UR21
6SN1124-1AB00-0CA1    6SN1124-1AB00-0CA2 6SN1124-1AB00-0HA0 6ES5464-8MB11 6ES5955-3NA12 6ES5948-3UA22
  6ES5464-8MC11 6ES5955-3LC42 6ES5948-3UA23
6ES5464-8MD11 6ES5955-3LF12 6ES5948-3UR11
6ES5464-8ME11 6ES5955-3LF41 6ES5948-3UA12
6ES5464-8MF11 6ES5948-3UR53 6ES5948-3UA13
6ES5464-8MF21 6ES5955-3LC14 6ES5948-3UA21
6ES5464-8MG11 6ES5955-3LC41 6ES5947-3UR11
6ES5466-8MC11 6ES5948-3UR22 6ES5947-3UR21
6ES5467-8EA11 6ES5948-3UR23 6ES5948-3UA11