How to Choose the Right Circuit Breaker for Your Needs
2025-08-07
Introduction to Circuit Breakers
Circuit breakers are critical safety devices that protect electrical systems from overloads, short circuits, and fault currents. At SONTUOEC, we manufacture high-quality circuit breakers designed for residential, commercial, and industrial applications. This guide provides expert insights into selecting the perfect circuit breaker for your specific requirements.
Key Factors in Selecting a Circuit Breaker
1. Voltage Rating
Match the breaker's voltage capacity to your system:
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Low Voltage (LV): <1kV (Residential/Commercial)
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Medium Voltage (MV): 1kV-72.5kV (Industrial)
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High Voltage (HV): >72.5kV (Utility)
2. Current Rating
| Application | Typical Current Range | SONTUOEC Series |
|---|---|---|
| Residential | 15A-100A | ST-HB Series |
| Commercial | 100A-800A | ST-CB Series |
| Industrial | 800A-6300A | ST-IB Series |
3. Breaking Capacity
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Standard: 10kA (Home use)
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High: 25-65kA (Commercial)
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Ultra-high: 100kA+ (Industrial)
4. Trip Characteristics
| Type | Response Time | Best For |
|---|---|---|
| Type B | Instant at 3-5x In | General lighting |
| Type C | Instant at 5-10x In | Motors, transformers |
| Type D | Instant at 10-20x In | High inrush currents |
SONTUOEC Circuit Breaker Product Line
Technical Specifications
| Model | Type | Voltage | Current Range | Breaking Capacity | Standards |
|---|---|---|---|---|---|
| ST-HB15 | Miniature | 240V | 6A-63A | 10kA | IEC 60898 |
| ST-CB250 | Molded Case | 690V | 100A-800A | 65kA | IEC 60947 |
| ST-IB4000 | Air Circuit | 1000V | 800A-6300A | 100kA | IEC 60947 |
Advanced Features
✔ Smart trip units with digital displays
✔ Earth leakage protection (30mA-30A)
✔ Arc fault detection technology
✔ Remote monitoring capabilities
Circuit Breaker Selection Guide
By Application
| Application | Recommended Type | Key Features Needed |
|---|---|---|
| Home Wiring | Miniature (MCB) | Type B/C, 6kA |
| Data Center | Molded Case (MCCB) | High breaking capacity |
| Manufacturing | Air Circuit (ACB) | Adjustable settings |
| Solar Systems | DC Breakers | Special DC arc quenching |
Installation Considerations
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Panel compatibility (busbar connection type)
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Environmental conditions (IP rating)
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Future expansion (modular designs)
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Maintenance requirements
FAQ: Circuit Breaker Selection
Q: How do I determine the right size circuit breaker for my application?
A: Follow this calculation method:
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Calculate load current:
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For single-phase: I = P/V
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For three-phase: I = P/(V×1.732×pf)
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Apply safety factor:
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Continuous loads: 125% of calculated current
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Non-continuous: 100%
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Select next standard size up (e.g., 28A → 32A breaker)
SONTUOEC provides free load calculation services with every inquiry.
Why Choose SONTUOEC Circuit Breakers?
✔ 30% faster trip response than industry standards
✔ 5000+ mechanical operations guaranteed
✔ UL, CE, RoHS certified
✔ Custom configurations available
✔ 24/7 technical support
Get Expert Assistance Today
For product specifications or technical consultation:
📞 Tel: +86-13868610160
📧 Email: [email protected]
With 25 years in electrical protection solutions, I personally guarantee SONTUOEC circuit breakers provide reliable protection for your most critical systems. Contact us for your project requirements!