Scope of Application
The OKM1LE series Residual Current Operated Circuit Breaker (here in after referred to as the circuit breaker) is suitable for circuits with AC 50Hz, rated voltage up to 400V, and rated current from 40A to 630A. Its main function is to provide indirect contact protection against fatal electric shock hazards. It can also be used to prevent electrical fires caused by earth fault currents. Additionally, it can protect lines against overload and short circuit, and can serve for the infrequent switching of lines.
The residual current operated circuit breaker can be installed vertically (upright mounting) or horizontally (side mounting).
The circuit breaker complies with the standard: GB/T 14048.2 “Low-voltage switchgear and controlgear – Part 2: Circuit-breakers”.
Technical Parameters
| Model | Frame Current Rating (A) | Rated Current In (A) | Rated Operational Voltage Ue (V) | Poles | Rated Residual Operating Current IΔn (mA) | Rated Residual Non-Operating Current IΔno (mA) | Ultimate Short-Circuit Breaking Capacity Icu (kA) | Service Short-Circuit Breaking Capacity Ics (kA) | Arcing Distance (mm) | Rated Insulation Voltage Ui (V) | Rated Impulse Withstand Voltage Uimp (kV) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| OKM1LE-100 | 100 | 16, 20, 25, 40, 50, 63, 80, 100 | 400 | 3, 4 | 100, 300, 500 | 50, 150, 250 | 35 | 22 | ≤50 | 690 | 8 |
| OKM1LE-250 | 250 | 100, 125, 140, 160, 180, 200, 225, 250 | 400 | 3, 4 | 100, 300, 500 | 50, 150, 250 | 50 | 35 | ≤50 | 800 | 6 |
| OKM1LE-400 | 400 | 225, 250, 315, 350, 400 | 400 | 3, 4 | 100, 300, 500 | 50, 150, 250 | 65 | 42 | ≤100 | 690 | 8 |
| OKM1LE-630 | 630 | 400, 500, 630 | 400 | 3, 4 | 100, 300, 500 | 50, 150, 250 | 70 | 45 | ≤100 | 690 | 8 |
Note: The three-level residual operating current adjustment can be selected arbitrarily by the user.