WoodWard（SEG）公司的保護繼電器廣泛的應用于歐洲及世界各地。在中國，SEG 的保護繼電器安全、可靠的運行于上海地鐵明珠三號線及廣州、北京、長沙等地的輸配電系統。
　　"WI系列"保護繼電器*供電電源。電流保護功能齊全。配合適當的電流互感器、低功率跳閘線圈及保護裝置，可大大節省成本。

Woodward SEG里面客戶常搜的型號有：
DB1
PCL1-IULA
PCL1-IULF 
PCL1-IULU 
PCL1-IULFU 
PCL1-IUHA
PCL1-IUHF 
PCL1-IUHU
PCL1-IUHFU 
PCM1-M-IULA 
PCM1-M-IUHA
PCM1-G-IUL-IA 
PCM1-G-IUH-IA 
PCM1-G-IUH-EA 
PCM1-GIULF 
PCM1-GIULU 
PCM1-GIULFU 
PCM1-GIUHF 
PCM1-GIUHU
PCM1-GIUHFU 
PCM1-MIULF 
PCM1-MIULU 
PCM1-MIULFU 
PCM1-MIUHF 
PCM1-MIUHU 
PCM1-MIUHFU 
EM1-D-DR
SG1-3 
FL-LAB-01
FL-LAB-02
FL-CON-01
FL-CON-02
FL-CON-03
T-CON-01
T-CON-02
XD1-TSP
XD1-TSAT
XD1-TSPSAT
XD1-G
XD1-GSP
XD1-GSAT
XD1-GSPSAT
XD1-L
XD1-LSP
XD1-LSAT
XD1-LSPSAT
I-ADAP
U-ADAP
BU1-AC- (110 / 230 / 400)
BUA1- (110 / 230 / 400)
BU1-DC2- (12 / 24)
BF1- (110 / 230 / 400)
BA1- (110 / 230 / 400)
BN1-400
BP1-R- (110 / 230)
BZ1-G- (12 / 24)
BZ1-P- (12 / 24)
BV1- (110 / 230 / 400)
WI line series
WIP1-1I1E1
WIP1-2I1E1
WIP1-3I1E1-M
WIP1-PS
WIP1-BAT1
WIP1-BAT2
WIC1-1PE
WIC1-2PE
WIC1-3PE
WIC1-PC2
WIC1-HP
WIC1-W2AS1 (16-56A CT)
WIC1-WE2AS1 (16-56A CT)
WIC1-W3AS1 (32-112A CT)
WIC1-W4AS1 (64-224A CT)
WIC1-W5AS1 (128-448A CT)
WIM1-C-1-EL-1
WIM1-C-1-RM-1
WIM1-S-1-EL-1
WIM1-S-1-RM-1
WIM1-C-5-EL-1
WIM1-C-5-RM-1
WIM1-S-5-EL-1
WIM1-S-5-RM-1
WIM1-H1-EL2
WI1-SZ2
WI1-SZ4
WI1-SZ5
DU2-6- (12 / 24)
DX1- (12 / 24)
ED2-8- (12 / 24)
NB2-1-8
NC3-1-8
NC3-2-8
NC3-1-16
NC3-2-16
NC3-3-16
FC1-8-24 (new)