TNR-B series surge protector device is applicable to TT,TN etc power supply system with AC 50-60HZ,380V and below .widely applicable to different kinds of power supply second class(B class) overvoltage protection .General installed in low voltage main distribution box or low voltage general switch box of building.
| Rated voltage Un (V~) | 220/380 | |
| Continuous voltage Uc (V~) | 385 | 420 |
| Standard discharge current In(KA) | 25 8/20μS | |
| Max current capacity Imax(KA) | 50 8/20μS | |
| Response time (ns) | < 25 | |
| Protection level | < 1.9 | < 2.0 |