Product Overview
The modular intelligent circuit breaker (hereinafter referred to as “circuit breaker”) is designed for AC 50 Hz systems, with a rated operating current up to 630 A, rated insulation voltage of 1000 V, and rated operating voltage of AC 400 V. It is used for power distribution protection applications.
The circuit breaker provides long-time delay, short-time delay, instantaneous, and residual current protection, as well as overvoltage, undervoltage, and phase-loss protection functions, effectively safeguarding circuits and power supply equipment.
It is capable of collecting and feeding back electrical parameters of terminal equipment in distribution areas, including current, voltage, power, energy consumption, and terminal temperature. Measurement accuracy reaches metering-grade levels, enabling precise load-side monitoring and supervision. This helps reduce power grid operation and maintenance costs and provides essential data support for future intelligent distribution area systems.
In addition, the circuit breaker supports automatic identification of distribution network topology within the distribution area and power line carrier communication functions.
Standards Compliance:
GB/T 14048.2
DL/T 20.. Residual Current Protection Device Communication Specification
Main Technical Parameters
| Item | Parameter Description | 250A | 400A | 630A |
|---|---|---|---|---|
| Frame size rated current Inm (A) | 250A | 400A | 630A | |
| Applicable poles | 3P+N / 4P | 3P+N / 4P | 3P+N / 4P | |
| Rated operating voltage Ue (V) | AC400 / 50Hz | AC400 / 50Hz | AC400 / 50Hz | |
| Rated current In (A) | 0.4–1.0 In continuously adjustable | 0.4–1.0 In continuously adjustable | 0.4–1.0 In continuously adjustable | |
| Rated insulation voltage Ui (V) | 1000 | 1000 | 1000 | |
| Rated impulse withstand voltage Uimp (kV) | 12 | 12 | 12 | |
| Breaking capacity class | L / M / H | L / M / H | L / M / H | |
| Rated ultimate short-circuit breaking capacity Icu (kA) | 36 / 70 / 85 | 36 / 70 / 85 | 36 / 70 / 85 | |
| Rated service short-circuit breaking capacity Ics (kA) | 36 / 70 / 85 | 36 / 70 / 85 | 36 / 70 / 85 | |
| Rated short-time withstand current Icw (kA/s) | 5/0.5, 10/1 | 5/0.5, 10/1 | 10/0.5, 15/1 | |
| Overload delay time factor (s) | 3–18 adjustable | 3–18 adjustable | 3–18 adjustable | |
| Short-time delay multiple (×In) | 2–10 adjustable | 2–10 adjustable | 2–10 adjustable | |
| Short-time delay time (ms) | 100–400 continuously adjustable | 100–400 continuously adjustable | 100–400 continuously adjustable | |
| Instantaneous trip multiple (×In) | 4–12 adjustable | 4–12 adjustable | 4–12 adjustable | |
| Overvoltage trip value (V) | Default 275 (user adjustable) | Default 275 (user adjustable) | Default 275 (user adjustable) | |
| Undervoltage trip value (V) | Default 165 (user adjustable) | Default 165 (user adjustable) | Default 165 (user adjustable) | |
| Phase-loss trip value (V) | Default 120 (user adjustable) | Default 120 (user adjustable) | Default 120 (user adjustable) | |
| Rated residual operating current IΔn (mA) | 30–1000 mA (8 selectable parameter sets) | 30–1000 mA | 30–1000 mA | |
| Rated residual non-operating current IΔno (mA) | 70% IΔn | 70% IΔn | 70% IΔn | |
| Rated residual non-operating time (s) | 0.06 / 0.1 / 0.2 | 0.06 / 0.1 / 0.2 | 0.06 / 0.1 / 0.2 | |
| Residual current operating characteristic | AC type | AC type | AC type | |
| Rated residual short-circuit making capacity (kA) | IΔm = 25% Icu | IΔm = 25% Icu | IΔm = 25% Icu | |
| Product usage category | Class A | Class B | Class B |
Product Model and Meaning
| QK | M | 9 | L | □ | – | 400 | C | □ | / | □ | □ | □ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| No. | Description |
|---|---|
| (1) | Enterprise code |
| (2) | Molded case circuit breaker |
| (3) | Design sequence number |
| (4) | With residual current protection function |
| (5) | Rated residual operating current: No mark: 30 mA (delay type only) / 50 mA / 100 mA / 200 mA / 300 mA / 400 mA / 500 mA / 600 mA / 800 mA / 1000 mA (stepped adjustable) “P” mark: 50 mA / 100 mA / 150 mA / 200 mA / 300 mA (step adjustable) |
| (6) | Frame size rated current (A) |
| (7) | “C”: double break points, internal arc extinguishing grid, controller secondary thermal plug-in structure |
| (8) | Breaking capacity: “L” standard breaking, “M” higher breaking, “H” high breaking |
| (9) | Poles: “3N” = 3P+N (3 protected poles, N pole not disconnectable); “4” = 4P (3 protected poles, N pole disconnectable) |
| (10) | With “H”: supports hot-plug carrier wave module; without “H”: RS485 |
| (11) | With “R”: includes thermal trip; without “R”: no thermal trip |