Scope of Application
TheQKB7-125 series Miniature Circuit Breakers are suitable for circuits with AC 50/60Hz, rated voltage up to 400V (and single-phase 230V), and a rated insulation voltage of 690V. Designed for rated currents from 63A to 125A, they are used to provide short-circuit and overload protection for buildings and electrical equipment. They can also serve for infrequent switching of circuits under normal conditions, as well as for isolation, undervoltage protection, and remote disconnection of lines.
This product features an attractive appearance, compact size, lightweight, precise current tripping settings, reliable operation, high breaking capacity, rapid tripping, DIN rail mounting, and modular design. It can be combined with accessories such as auxiliary contacts, alarm signal contacts, undervoltage releases, and shunt trip releases to meet the needs of various users. This product complies with the standard: GB/T 14048.2.
Technical Parameters
- Rated Operational Voltage: AC 230V/400V (Single Pole), AC 400V (Multi-Pole)
- Rated Short-Time Withstand Current (Icw): 1.5kA, Duration 1s
- Rated Short-Circuit Making Capacity (Icm): 2.5kA, Duration 1s
- Operating Performance: Mechanical Endurance – 8500 cycles; Electrical Endurance – 1500 cycles
- Rated Insulation Voltage (Ui): 690V
- Rated Impulse Withstand Voltage (Uimp): 4kV
- Utilization Category: AC-22A