Scope of Application
The QKB7LE-125 Miniature Residual Current Circuit Breaker is suitable for AC 50Hz or 60Hz circuits with rated voltages of 230V for single-pole two-wire and two-pole configurations, and 400V for three-pole, three-pole four-wire, and four-wire configurations. It is designed for rated currents from 32A to 125A. In the event of electric shock or when the grid leakage current exceeds the specified value, the residual current operated circuit breaker can automatically cut off the power supply within an extremely short time to protect personal safety and electrical equipment. It also protects lines and motors against overload or short circuits and can serve for infrequent switching of lines or infrequent starting of motors.
This product complies with the GB/T 16917.1 standard.
Technical Parameters
- Rated Operational Voltage: Single-pole two-wire and two-pole: 230V; Three-pole and three-pole four-wire: 400V.
- Rated Insulation Voltage (Ui): 400V.
- Rated Impulse Withstand Voltage (Uimp): 4kV.
- Rated Residual Non-Operating Current (IΔno): 0.5 IΔn A.
- Time-Delay Type Limit Non-Driving Time: 0.06s, 0.1s.
- Rated Short-Circuit Breaking Capacity (Icn/Ics): 10000/7500A.
- Rated Residual Making and Breaking Capacity (IΔm): 2000A.
- Operating Performance:
- Electrical Endurance: 1500 operations, cos φ: 0.85 ~ 0.9.
- Mechanical Endurance: 8500 operations.