Product Overview
The Modular Intelligent Circuit Breaker (here in after referred to as the “circuit breaker”) is suitable for power distribution protection in AC 50 Hz systems, with a rated operating current up to 630 A, a rated insulation voltage of 1000 V, and a rated operating voltage of AC 400 V. The circuit breaker provides long-time delay, short-time delay, instantaneous, residual current, over/under voltage, and phase failure protection functions, safeguarding circuits and power supply equipment.
It is capable of feeding back information such as current, voltage, power, energy, and terminal temperature to the terminal devices in the distribution area with metering-level accuracy. This supports load-side monitoring and control, reduces the operational and maintenance costs of the power grid, and provides essential data for future intelligent distribution area systems. The circuit breaker also features automatic identification of the distribution network topology within the area and power line carrier communication capabilities.
Standards Compliance:
The product complies with the following standards:
GB/T 14048.2, DL/T 20… (Communication Protocol for Residual Current Protective Devices).
Product Model Number and Its Meaning
| QK | M | L | – | 400 | C | M | / | 3N | / | 630A |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 5 | 6 | 7 | 8 | 9 |
(1) Enterprise Code
(2) Molded Case Circuit Breaker
(3) Design Serial Number
(4) Equipped with Residual Current Operated Protection Function
(5) Frame Rated Current
(6) C: Plug-in / Pluggable Controller
(7) Breaking Capacity: M – Higher Breaking Capacity, H – High Breaking Capacity, S – Standard Breaking Capacity
(8) Number of Poles: 3N indicates 3P+N (three protected poles, N pole continuously connected)
(9) Rated Current: Product’s set rated current rating. Omitted when identical to the Frame Rated Current
| Technical Specifications (English Professional Version) | |||||||||
| Item | QKM6L-160, QKM6L-250 | QKM6L-400 | QKM6L-630 | ||||||
| Frame Size | QKM6L-160 / QKM6L-250 | QKM6L-400 | QKM6L-630 | ||||||
| Rated Current In (A) | 63A–160A adjustable, 100A–250A adjustable | 160A–400A adjustable | 260A–630A adjustable | ||||||
| Rated Impulse Withstand Voltage Uimp (kV) | 8 | 12 | 12 | ||||||
| Rated Insulation Voltage Ui (V) | 1000 | 1000 | 1000 | ||||||
| Rated Operating Voltage Ue (V) | AC 400 | AC 400 | AC 400 | ||||||
| Number of Poles | 3P+N, 4P | 3P+N, 4P | 3P+N, 4P | ||||||
| Selectivity Class | B | B | B | ||||||
| Breaking Capacity Class | L | S | M | H | S | M | H | S | H |
| Rated Ultimate Short-Circuit Breaking Capacity Icu (kA) at AC400V | 25 | 35 | 50 | 70 | 35 | 50 | 85 | 50 | 85 |
| Rated Service Short-Circuit Breaking Capacity Ics (kA) at AC400V | 25 | 35 | 50 | 70 | 35 | 50 | 85 | 50 | 85 |
| Rated Short-Time Withstand Current Icw | 5kA / 0.5s | 5kA / 0.5s | 10kA / 1s | 8kA / 0.5s | 10kA / 1s | ||||
| Flashover Distance (mm) | 0 | 0 | 0 | ||||||
| Rated Residual Operating Current IΔn | 30mA–1000mA adjustable | 30mA–1000mA adjustable | 30mA–1000mA adjustable | ||||||
| Limit Non-Operating Time | 0.06s, 0.1s, 0.2s | 0.06s, 0.1s, 0.2s | 0.06s, 0.1s, 0.2s | ||||||
| Rated Residual Short-Circuit Making & Breaking Capacity IΔcm | 25% Icu | 25% Icu | 25% Icu | ||||||
| Mechanical Endurance (operations) | 10000 | 5000 | 5000 | ||||||
| Electrical Endurance (operations) | 2000 | 1200 | 1200 | ||||||
| Overall Dimensions (L×W×H) (mm) | 240×142×132 | 336×198×165 | 355×240×177 | ||||||