Product Overview
The QKB3E series external circuit breaker for energy meters is designed to work with prepaid energy meters, offering a range of intelligent functions:
- Meter control & feedback: Controlled by the energy meter, with feedback on ON/OFF status.
- Fee control: Tripping on power cutoff, auto-reclosing after payment, and remote control.
- Auto-operation: Auto-tripping on power outage, undervoltage, overvoltage, or phase loss; auto-reclosing when power/voltage is restored.
- PV grid-tie support: Auto-reclosing when grid power is restored, and auto-tripping when grid power fails (realizing “ON with grid power, OFF without grid power”), then auto-reclosing after power restoration.
- Line protection: Provides short-circuit, overload, overvoltage, undervoltage, and phase loss protection for power lines.
This breaker complies with:
- GB/T 10963.1 Electrical accessories – Circuit-breakers for overcurrent protection for household and similar installations – Part 1: Circuit-breakers for AC
- Q/GDW 11421-2020 Technical specifications for external circuit breakers for energy meters
Model Selection Guide
| Code Segment | Definition | Options & Specifications |
|---|---|---|
| QKB3E | Product Code | External circuit breaker for energy meters |
| 80 | Frame Grade (Inm) | 80, 125 |
| G | PV Function | G: PV grid-tie |
| M | Fee Control Type | None: No fee controlA: Level controlB: Bluetooth controlR: RS485 control |
| 2P | Pole Number | 2P, 3P+N, 4P |
| 63A | Rated Current (In) | 40A, 50A, 63A, 80A, 100A, 125A |
Functional Features & Operation Logic
Overvoltage & Undervoltage Protection Logic Table
| Action Type | Default Threshold | Status |
|---|---|---|
| Overvoltage Protection | 290V±10V, 2S | Trip |
| Overvoltage Recovery | 260V±10V, 5S | Restore |
| Undervoltage Protection | 160V±10V, 2S | Trip |
| Undervoltage Recovery | 190V±10V, 5S | Restore |
| Loss of Voltage Protection | 50V, 0S | Trip |
| Loss of Voltage Recovery | 90V±10V, 4S (Note 2) | Restore |
| Phase Loss Protection | 50V±10V, 2S | Trip |
| Phase Loss Recovery | 190V±10V, 5S | Restore |
Notes:
- If overvoltage tripping occurs 5 times within 10 minutes, the breaker enters a self-locking state. It will not auto-reclose when voltage is restored, requiring manual reset. Main circuit loss or manual closing resets the overvoltage counter.
- Loss of voltage recovery is actually an upper-time delay, complying with Q/GDW 11421-2020 (Clause 4.2.10), with a power-on delay (td) ≥ 4S.
- Loss of voltage protection means all three-phase voltages drop below the threshold.
Breaker Status Control Table
| No. | Phase Line | Control Signal | Initial State | Post-Action State | Remarks |
|---|---|---|---|---|---|
| 1 | AC220V | ↑ | Tripped | Closed | (0V → AC220V) Closing signal received |
| 2 | AC220V | AC220V | Closed | Tripped | Manual tripping |
| 3 | AC220V | AC220V | Tripped | Closed | Manual closing |
| 4 | AC220V | ↓ | Closed | Tripped | (AC220V → 0V) Tripping signal received |
| 5 | AC220V | ↓ | Tripped | Tripped | (AC220V → 0V) Tripping signal received |
| 6 | AC220V | 0V | Tripped | Tripped | 0V control signal, closing not allowed |
| 7 | AC220V | AC220V | Closed | Closed | Closed before power outage; no tripping allowed after power restoration |
| 8 | AC220V | AC220V | Tripped | Tripped | Tripped before power outage; no closing allowed after power restoration |
| 9 | 0V | / | Tripped | Tripped | Power outage, maintain state |
| 10 | 0V | / | Closed | Closed | Power outage, maintain state |
Technical Specifications & Ordering Instructions
| Item | Unit | QKB3E-80 | QKB3E-125 | ||
|---|---|---|---|---|---|
| 2P, 4P | 1P+N, 2P, 3P+N, 4P | ||||
| Frame Grade Rated Current (Inm) | A | 80 | 125 | ||
| Rated Current (Ie) | A | 40, 50, 63, 80 | 40, 50, 63, 80, 100, 125 | ||
| Rated Working Voltage (Ue) | V | AC230V, AC400V | AC230V, AC400V | ||
| Rated Frequency (f) | Hz | 50 | 50 | ||
| Rated Insulation Voltage (Ui) | V | 500 | 500 | ||
| Rated Impulse Withstand Voltage (Uimp) | kV | 6 | 6 | ||
| Rated Short-Circuit Capacity (Icn) | kA | 6 | No: 6; H: 10 | ||
| Rated Operational Short-Circuit Capacity (Ics) | kA | 6 | No: 6; H: 7.5 | ||
| Remote Auto-Reclosing Time (tc) | s | ≤ 3 (configurable) | ≤ 3 (configurable) | ||
| Power-On Delay Time (td) | s | ≥ 4 (configurable) | ≥ 4 (configurable) | ||
| Service Life (Cycles) | |||||
| Mechanical Life | Cycles | 10000 | 10000 | ||
| Electrical Life | Cycles | 4000 | 4000 | ||
| Overall Dimensions (mm) | |||||
| Width | mm | 54 (2P), 90 (4P) | 81 (2P), 135 (3P+N/4P) | ||
| Length | mm | 97.5 | 99 | ||
| Height | mm | 72 | 72 |
Ordering Instructions
Orders must be placed in accordance with the model selection guide, with complete configuration information.
Order Format
Product Name + Model & Specification + Quantity
Specification Description Elements
- Breaker name (External circuit breaker for energy meters; PV special use)
- Model (e.g., QKB3E-80)
- PV function (e.g., G: PV grid-tie)
- Fee control type (e.g., A: AC220V level control)
- Pole number (e.g., 2P)
- Rated current (e.g., 63A)
- Quantity (e.g., 100 units)
Order Example
External circuit breaker for energy meters (PV special use); QKB3E-80GA/2P/63A; Quantity: 100 units.