西玛可控硅晶闸管N1863CH28 N4400TC260
由于半导体器件体积小、热容量小，特别像晶闸管这类高电压大电流的功率器件，结温必须受到严格的控制，否则将遭至彻底损坏。当晶闸管中流过大于额定值的电流时，热量来不及散发，使得结温迅速升高，将导致结层被烧坏。
产生过电流的原因是多种多样的，例如，变流装置本身晶闸管损坏，触发电路发生故障，控制系统发生故障等，以及交流电源电压过高、过低或缺相，负载过载或短路，相邻设备故障影响等。
晶闸管过电流保护方法常用的是快速熔断器。由于普通熔断器的熔断特性动作太慢，在熔断器尚未熔断之前晶闸管已被烧坏；所以不能用来保护晶闸管。快速熔断器由银制熔丝埋于石英沙内，熔断时间极短，可以用来保护晶闸管。快速熔断器的性能主要有以下几项表征。
N880CH24 N2543ZC240
N880CH26 N2543ZC260
N880CH28 N2543ZC280
N880CH30 N2543ZC300
N900CH20 N3012ZC200
N900CH24 N3012ZC240
N900CH26 N3012ZC260
N1400CH02 N3533ZC140
N1400CH04 N3533ZC160
N1400CH06 N3533ZC180
N1400CH08 N3533ZC200
N1400CH10
N1400CH12
N1400CH14
N1400CH16
N1400CH18
N1400CH20
N1600CH08 N4085ZC080
N1600CH10 N4085ZC100
N1600CH12 N4085ZC120
N1463CH36 N3476TC360
N1463CH38 N3476TC380
N1463CH40 N3476TC400
N1463CH42 N3476TC420
N1663CH30 N3839TC300
N1663CH32 N3839TC320
N1663CH35 N3839TC350
N1863CH20 N4400TC200
N1863CH24 N4400TC220
N1863CH26 N4400TC240
N1863CH28 N4400TC260
N1863CH22 N4400TC280
N1483CH36 N4151FC360
N1483CH38 N4151FC380
N1483CH40 N4151FC400
N1483CH42 N4151FC420
N1683CH29 N4803FC300
N1683CH30 N4803FC320
N1683CH32 N4803FC340
N1683CH35 N4803FC350
N1883CH20 N5177FC200
N1883CH22 N5177FC220
N1883CH24 N5177FC240
N1883CH26 N5177FC260
N1883CH28 N5177FC280
N1983CH18 N5946FC180
N1983CH20 N5946FC200
N1983CH22 N5946FC220
R210SH10 R0487YS10D
R210SH12 R0487YS12D
R0487YS10E R0487YS14D
R0487YS12E R0487YS10F
R0487YS14E R0487YS12F
R0487YS14F R0633YS12F
R185SH08 R0577YS08C
R185SH10 R0577YS10C
R185SH12 R0577YS12C
R0577YS08D R0577YS08E
R0577YS10D R0577YS10E
R0577YS12D R0577YS12E
R216SH08 R0633YS10D
R216SH10 R0633YS12D
R216SH12 R0633YS10E
R0633YS10F R0633YS12E
R181SH14 R0717LS14G
R181SH16 R0717LS16G
R0717LS14H R0717LS16H
R0717LS14J R0717LS16J
R181SH14 R0717LS14G
R181SH16 R0717LS16G
R0717LS14J R0717LS14H
R0717LS16J R0717LS16H
R175SH20 R0736LS20J
R175SH22 R0736LS22J
R175SH24 R0736LS24J
R175SH25 R0736LS25J
R0736LS20K R0736LS20L
R0736LS20K R0736LS22L
R0736LS20K R0736LS24L
R0736LS20K R0736LS25L
R0736LS20M R0736LS24M
R0736LS22M R0736LS25M
R180SH06 R0809LS06A
R180SH08 R0809LS08A
R180SH10 R0809LS10A
R0809LS06B R0809LS08B
R0809LS10B R0809LS06C
R0809LS10C R0809LS08C
R190SH10 R0830LS10D
R190SH12 R0830LS12D
R190SH14 R0830LS14D
R0830LS10E R0830LS10F
R0830LS12E R0830LS12F
R0830LS14E R0830LS14F
R0830LS10G R0830LS12G
R0830LS14G
R200SH16 R0878lS16K
R200SH18 R0878lS18K
R200SH21 R0878lS21K
R0878lS16M R0878lS18M
R0878lS21M
R219SH08 R0929LS08C
R219SH10 R0929LS10C
R219SH12 R0929LS12C
R0929LS08D R0929LS10D
R0929LS12D R0929LS08E
R0929LS10E R0929LS12E
R220SH08 R0964LS08D
R220SH10 R0964LS10D
R220SH12 R0964LS12D
R0964LS08E R0964LS10E
R0964LS12E R0964LS08F
R0964LS10F R0964LS12F
R270SH04 R0990lS04A
R270SH06 R0990lS06A
R270SH08 R0990lS08A
R0990lS04B R0990lS04C
R0990lS06B R0990lS06C
R0990lS08B R0990lS08C
D315CH32 R1127NC32R
D315CH34 R1127NC34R
D315CH36 R1127NC36R
R1127NC32S R1127NC32T
R1127NC34S R1127NC34T
R1127NC36S R1127NC36T
R305SH14 R1124NS14K
R305SH16 R1124NS16K
R305SH18 R1124NS18K
R305SH20 R1124NS20K
R305SH21 R1124NS21K
R1124NS14M R1124NS16M
R1124NS18M R1124NS20M
R1124NS21M
D350SH24 R1158NS24N
D350SH26 R1158NS26N
R1158NS24P R1158NS26P
R350SH08 R1211NS08D
R350SH10 R1211NS10D
R350SH12 R1211NS12D
R1211NS08E R1211NS10E
R1211NS12E
R325SH10 R1178NS10E
R325SH12 R1178NS12E
R325SH14 R1178NS14E
R1178NS10F R1178NS10G
R1178NS12F R1178NS12G
R1178NS14F R1178NS14G
R355SH08 R1271NS08D
R355SH10 R1271NS10D
R355SH12 R1271NS12D
R1271NS08E R1271NS08G
R1271NS10E R1271NS10G
R1271NS12E R1271NS12G
R395SH14 R1275NS14L
R395SH16 R1275NS16L
R395SH18 R1275NS18L
R395SH20 R1275NS14M
R395SH21 R1275NS16M
R1275NS18M
D391SH22 R1279NS22J
D391SH24 R1279NS24J
D391SH25 R1279NS25J
R1279NS22K R1279NS24K
R1279NS25K R1279NS22M
R1279NS24M R1279NS25M
D390SH18 R1280NS18J
D390SH20 R1280NS20J
D390SH22 R1280NS22J
D390SH25 R1280NS25J
R1280NS18K R1280NS18M
R1280NS20K R1280NS20M
R1280NS22K R1280NS22M
R1280NS25K R1280NS25M
D450SH10 R1331NS10B
D450SH12 R1331NS12B
R1331NS10C R1331NS10D
R1331NS10C R1331NS12D
R400SH08 R1446NS08E
R400SH10 R1446NS10E
R400SH12 R1446NS12E
R1446NS08F R1446NS08G
R1446NS10F R1446NS10G
R1446NS12F R1446NS12G
D405SH14 R1448NS14H
D405SH16 R1448NS16H
D405SH18 R1448NS18H
D405SH20 R1448NS20H
R1448NS14J R1448NS14L
R1448NS16J R1448NS16L
R1448NS18J R1448NS18L
R1448NS20J R1448NS20L
R500CH20 R2475ZC20N
R500CH24 R2475ZC22N
R500CH26 R2475ZC24N
R500CH28 R2475ZC26N
R500CH22 R2475ZC28N
R600CH18 R2619ZC18J
R600CH20 R2619ZC20J
R600CH22 R2619ZC22J
R600CH24 R2619ZC24J
R600CH25 R2619ZC25J
