| Model | Category | Reference voltage | Rated current In | Impulse constant |
| DDS858 | Single phase | 220V | 1.5(6)A (CT type) | Based on nameplate |
| 3(6)A (CT type) | ||||
| 1.5(6)A(Direct connection) | ||||
| 3(6)A(Direct connection) | ||||
| 2.5(10)A | ||||
| 3x20(80)A | ||||
| 5(20)A | ||||
| 10(40)A | ||||
| 15(60)A | ||||
| 20(80)A | ||||
| 30(100)A |
Basic error limit when balanced load.
| Load current | Power factor | Basic error range | |
| 1 class | 2 class | ||
| 0.05Ib ≤ I < 0.1Ib | 1 | ±1.5 | ±2.5 |
| 0.1Ib ≤ I ≤ Imax | 1 | ±1.0 | ±2.0 |
| 0.1Ib ≤ I < 0.2Ib | 0.5 (inductive)/0.8 (capacitive) | ±1.5 | ±2.5 |
| 0.2Ib ≤ I ≤ Imax | 0.5 (inductive)/0.8 (capacitive) | ±1.0 | ±2.0 |
| Data saving time after power failure | ≥10 years |
| Electrical Parameter | |
| Norma working voltage | 0.8~1.2 Rated voltage |
| Isolation voltage | ≥2000V (AC) |
| Voltage cycle power consumption | ≤1W |
| Battery consumption after power failure | ≤10 μA |
● Normal working temperature: -20°C~-50°C;
● Storage & transporttemperature:-25°C~+70°C;
● Extreme working temperature:-30°C~+60°C;
● Annual average humidity:≤75%.
Active energy testing port diagram
