| Model | Protection zone | Protection level | Suitable location | 
| TU2-10 | LPZ1,LPZ2 zone boundaries of and LPZn | Class 3 | Normally installed in the distribution box of the premises; or installed in the computer information equipment, electronic equipment and control equipment, or the nearest lighting box, socket box. | 
| TU2-40 | boundaries of LPZ0B and LPZ1 zone,or LPZ1 and LPZ2 zone | Class2 | Usually installed in the building distribution electric box,metering box;or installed in the computer center,motor housing,building control room,monitoring room, industrial automation,operation room and other places of power distribution box;also can be installed in the general distributionbox of the six floors below building, or the general distribution box of villa | 
| TU2-80 | LPZOA,LPZ0B zone boundaries of LPZ1 zone | Class1 | Usually installed in the piercing lined low voltage main distribution cabinet | 
| TU2-1 | Used in LPZ0A,LPZ0B zone | Class 1 | Usually used in lightning riskhigher equipment system of the first primary surge protection, installed in the general distribution box of distribution box, outdoor distribution box and so on. | 
Distribution network grounding systemvoltage
| Grounding system | TT system | TN-S system | TN-C-Ssystem | IT system | 
| The maximum voltage of the grid | 345V/360V | 253V/264V | 253V/264V | 398V/415V | 
Main technical parameters and performance
| Project Name | Parameter | TU2-10 | TU2-20 | ||||
| Nominal discharge current | In(kA) | 5 | 10 | ||||
| Maximum discharge current | Imax(KA) | 10 | 20 | ||||
| Maximum continuous operating voltage | Uc(V) | 275 | 320 | 385 | 275 | 320 | 385 | 
| Voltage protection level | Up(kV) | 1.0 | 1.3 | 1.3 | 1.3 | 1.5 | 1.5 | 
| Test classification | Grade III testing | Grade III testing | |||||
| Poles | 2,4,1N | 2,4,1N | |||||
| Structure type | D,B type | D,B type | |||||
| operation status | Window indicator | Colorless or green:normal,red: fault | Colorless or green:normal,red: fault | ||||
| Backup protective | Backup fuse | gl/gG16A | gl/gG16A | ||||
| Backup CB | C10 | C16 | |||||
| dimensions | Refer to drawing no.1,3,4 | Refer to drawing no.1,3,4 | |||||
| Project Name | Parameter | TU2-10 | TU2-20 | ||||||
| Nominal discharge current | In(kA) | 20 | 30 | ||||||
| Maximum discharge current | Imax(KA) | 40 | 60 | ||||||
| Maximum continuous operating voltage | Uc(V) | 275 | 320 | 385 | 420 | 275 | 320 | 385 | 420 | 
| Voltage protection level | Up(kV) | 1.5 | 1.5 | 1.8 | 2.0 | 1.8 | 2.0 | 2.2 | 2.2 | 
| Test classification | Grade III testing | Grade III testing | |||||||
| Poles | 1,2,3,4,1N,3N | 1,2,3,4,1N,3N | |||||||
| Structure type | D,B,X type | D,B,X type | |||||||
| operation status | Window indicator | Colorless or green:normal,red: fault | Colorless or green:normal,red: fault | ||||||
| Backup protective | Backup fuse | gl/gG40A | gl/gG60A | ||||||
| Backup CB | C32 | C50 | |||||||
| dimensions | Refer to drawing no.1,3,4 | Refer to drawing no.1,3,4 | |||||||
 
               
               
               
               
               
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