FXM8LC Series Residual Current Operated Circuit Breaker with Intelligent Monitoring
Key Advantages
- Comprehensive protection functions: Residual current, overload, short circuit, phase loss, overvoltage, undervoltage, unbalance, and zero line loss protection
- Intelligent monitoring: LCD display with real-time load current, residual current display, action status indication, and trip data display
- Automatic reclosing: Smart automatic reclosing function with adjustable reclosing interval time (20-60s)
- Wide current range: 125A to 800A across 125/250/400/630/800 frame sizes
- High breaking capacity: M type (35-65kA) & H type (65-85kA) for different applications
- Communication capability: Optional RS-485 communication with multiple protocols for remote monitoring and control
- Compact design: Integrated electric operating mechanism reduces installation space and simplifies wiring
- Flexible pole configurations: 3P+N (zero wire cannot be disconnected) and 4P (zero wire can be disconnected)
- Advanced fault recording: Records trip type, cause, time, voltage, current, and leakage data for detailed analysis
- Category B selective: Enables selective coordination with upstream and downstream protection devices
- Multiple setting options: Configurable operating current, breaking time, and main circuit current according to actual requirements
- Pluggable lightning protection module: Optional lightning protection module for enhanced surge protection
The FXM8LC series residual current operated circuit breaker is an advanced protection device designed for AC 50Hz, 400V distribution systems. Featuring intelligent monitoring, automatic reclosing, and comprehensive protection functions, it provides precise protection for circuits and electrical equipment against overload, short circuit, grounding faults, and indirect personal contact. The LCD display allows real-time monitoring of load current and residual current, while the intelligent control circuit enables fault cause tracking and historical data recording. With breaking capacities up to 85kA and current ratings to 800A, it offers reliable performance in demanding industrial and commercial applications. The optional RS-485 communication capability enables integration into smart power distribution systems for remote parameter adjustment and information query.
Basic Specifications
| Parameter | Specification | Details |
|---|---|---|
| Product Name | FXM8LC Series Residual Current Operated Circuit Breaker | With intelligent monitoring |
| Rated Insulation Voltage | AC 1000V | – |
| Rated Impulse Withstand Voltage | 8kV / 12kV | 125/250A: 8kV; 400/630/800A: 12kV |
| Rated Operating Voltage | AC 380/400/415V | 50Hz frequency |
| Rated Current Range | 125A – 800A | Across 5 frame sizes |
| Rated Residual Operating Current | 0.06A / 0.1A / 0.2A | Optional settings |
| Ultimate Non-driving Time | 0-0.5s | Delay type with automatic tracking |
| Number of Poles | 3P+N, 4P | Various N-pole configurations |
| Breaking Capacity Type | M Type & H Type | M: Standard; H: High breaking |
| Ultimate Breaking Capacity (Icu) | 35-85kA | Depending on frame and type |
| Service Breaking Capacity (Ics) | 50-85kA | Depending on frame and type |
| Short-time Withstand (Icw) | 5-10kA for 1s | Depending on frame size |
| Residual Short-circuit Making/Breaking (IΔm) | 25% of Icu | – |
| Selective Category | Category B | IEC/EN 60947-2 |
| Reclosing Interval Time | 20-60s | Manual closing not limited |
| Display Type | LCD / Digital | Y: LCD; S: Digital |
Frame Size & Breaking Capacity
| Frame Current In(A) | Overload Long Delay IR(A) | Icu (kA) | Ics (kA) | Icw (kA/1s) | Impulse Voltage (kV) |
|---|---|---|---|---|---|
| 125 | (0.4~1)In | M50 / H85 | M50 / H85 | 5 | 8 |
| 250 | (0.4~1)In | M65 / H85 | M65 / H85 | 10 | 8 |
| 400 | (0.4~1)In | M65 / H85 | M65 / H85 | 10 | 12 |
| 630 | (0.4~1)In | M35 / H65 | M50 / H65 | 10 | 12 |
| 800 | (0.4~1)In | M50 / H65 | M50 / H65 | 10 | 12 |
Note: M = Standard breaking capacity, H = High breaking capacity. Overload long delay setting range is (0.4~1)In.
Pole Configuration Options
| Pole Configuration | Description | Application |
|---|---|---|
| 3P+N | Three-pole four-wire, zero wire cannot be disconnected | Systems where neutral line must remain connected |
| 4P | Four-pole, zero wire can be disconnected | Systems requiring complete circuit isolation |
Protection Functions
Residual Current
0.06-0.2A
Adjustable
Grounding protection
Overload Long Delay
(0.4~1)In
Adjustable IR
Thermal protection
Short Circuit
Short delay
Instantaneous
Fast response
Phase Loss
Three-phase
Protection
Motor safety
Overvoltage
Adjustable
With delay
Equipment protection
Undervoltage
Adjustable
With delay
Equipment protection
Unbalance
Phase
Protection
Equipment safety
Zero Line Loss
Neutral
Protection
Safety critical
Intelligent Features
| Feature | Description | Benefit |
|---|---|---|
| LCD Display | Digital LCD screen with real-time data | Easy monitoring and status indication |
| Automatic Reclosing | Automatic circuit reclosing after fault clearing | Reduces downtime and manual intervention |
| Residual Current Display | Real-time leakage current monitoring | Early warning of insulation degradation |
| Load Current Display | Real-time load current monitoring | Load management and optimization |
| Trip Data Recording | Records trip type, cause, time, voltage, current, leakage | Facilitates fault analysis and troubleshooting |
| Fault Cause Tracking | Monitors and displays cause of fault trip | Quick fault identification and resolution |
| Historical Data Recording | Stores up to 113 trip records | Comprehensive event history for analysis |
| RS-485 Communication (Optional) | Remote monitoring and control via RS-485 | Integration into smart power systems |
Normal Working & Installation Conditions
- Ambient temperature: -20°C to +40°C (operating), lower limit -20°C, upper limit +40°C
- 24h average temperature: Not to exceed +35°C
- Relative humidity: Maximum 50% at +40°C, higher humidity at lower temperatures (special measures for condensation)
- Altitude: Not to exceed 2000m
- Pollution level: Level 3
- Installation orientation: Vertical mounting (maximum inclination ±5°)
- Environment: No rain or snow erosion
- Installation category: Category III (main circuit), Category II (auxiliary and control circuits)
- External magnetic field: Not to exceed 5 times the geomagnetic field in any direction
- Frequency: AC 50Hz
Operation Interface Features
Main Menu Functions
- Real-time display interface
- Parameter setting interface
- Parameter display
- Trip record query
- Number of trips statistics
- Self-check setting
- Factory maintenance
Control Buttons
- Up/Down: Move cursor or adjust settings
- Menu: Enter submenu
- Return: Return to previous interface
- Set: Move setting item cursor
- Confirm: Enter/exit setting status, save parameters
Recommended Applications
| Application Type | Description | BENEFIT |
|---|---|---|
| Three-phase Four-wire Systems | AC 50Hz, 400V distribution networks with neutral point directly grounded | Comprehensive protection for TN-S, TN-C-S systems |
| Industrial Power Distribution | Factory and industrial facility power protection | Reliable protection with intelligent monitoring |
| Commercial Buildings | Office buildings, shopping malls, hotels | Enhanced safety with ground fault protection |
| Data Centers | Critical infrastructure power protection | High reliability with automatic reclosing |
| Motor Control Centers | Motor protection and control systems | Phase loss and overload protection |
| Smart Grid Systems | Intelligent power distribution with communication | Remote monitoring and control capability |
Compliance Standards
GB/T 14048.2
Circuit Breakers
Low-voltage
Switchgear
GB/T 14048.4
Contactors
Motor Starters
IEC 60947-4-1
GB/T 32902
Residual Current
Devices
Protection
GB/T 22387
Residual Current
Operated Devices
Safety
Related Articles
Residual Current Protection in Modern Power Systems Intelligent Circuit Breakers for Smart Grid Applications Automatic Reclosing Technology in Distribution SystemsProduct Categories
Recommended Applications
Quick Specifications
Ordering Information
When ordering, please specify:
Example: FXM8LC-250M/3310 250A AC400V 0.1A LCD with RS-485
Contact Information
Hangzhou Weltrus New Energy Technology Co., Ltd.
Block D, Ocean International Center
333 Yuanjian Street, Hangzhou
Zhejiang, China
Tel/WhatsApp: +86 13735502672
Email: [email protected]
Contact UsCONTACT
+86-13735502672
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