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1P DC MCB – Solar/PV Breaker
The YCB8125PV series DC miniature circuit breaker is engineered for high-performance protection in photovoltaic (PV) systems, with a rated operational voltage of DC 1000V and current up to 125A.
Designed to IEC/EN 60947-2 standards, it ensures reliable isolation, overload, and short-circuit protection in solar energy installations, industrial equipment, and communication networks.
Its robust construction and compliance with international safety norms make it the ideal choice for safeguarding DC circuits in demanding environments.
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Product Details
High Voltage/Current Capacity
Rated Voltage: Supports DC 1000V (4P configuration), ideal for large-scale solar farms.
Rated Current: Up to 125A, compatible with high-power inverters and industrial equipment.
Breaking Capacity: 6kA (PV) / 10kA (PVn), compliant with IEC/EN 60947-2 for robust arc fault protection.
Global Compliance & Certifications
Standards: IEC/EN 60947-2, UL 489B (DC Molded-Case), RoHS environmental compliance.
Third-Party Testing: DC arc extinguishing performance reports for fast project approvals.
Modular Design & Easy Installation
Compact Size: Space-saving modular design, compatible with DIN35 rails for rapid deployment.
Flexible Wiring: Supports dual-terminal connections (6-35mm²), simplifying PV cable management.
MX Shunt Release: Supports AC/DC 12-415V control and Modbus RTU/RS485 integration.
SD Alarm Contact: Triggers red LED indicators for fault alerts.
Selection
| YCB8 | - | 125 | PV | 4P | 63 | DC250 | + | YCB8-63 OF |
| Model | Shell grade current | Usage | Number of poles | Rated current | Rated coltage | Accessories | ||
| Miniature circuit breaker |
125 | PV: heteropolarity Pvn: nonpolarity |
1P | 63A,80A, 100A, 125A |
DC250V | YCB8-125 OF: Auxiliary | ||
| 2P | DC500V | YCB8-125 SD: Alarm | ||||||
| 3P | DC750V | YCB8-125 MX: Shunt | ||||||
| 4P | DC1000V |
Note: The rated voltage is affected by the number of poles and wiring mode.
The single poleis DC250V, the two poles in series are DC500V, and so on.
Technical data
| Standard | IEC/EN 60947-2 | ||||
| Number of poles | 1p | 2p | 3p | 4p | |
| Rated current of shell frame grade | 125 | ||||
| Electrical performance | |||||
| Rated working voltage Ue(V DC) | 250 | 500 | 750 | 1000 | |
| Rated current In(A) | 63、80、100、125 | ||||
| Rated insulation voltage Ui(V DC) | 1000V | ||||
| Rated impulse voltage Uimp(KV) | 6 | ||||
| Ultimate breaking capacity Icu(kA) | Pv：6 PVn：10 | ||||
| Operation breaking capacity Ics(KA) | PV：Ics=100%Icu PVn：Ics=75%Icu | ||||
| Curve type | li=10ln | ||||
| Tripping type | Thermomagnetic | ||||
| Service life (time) | Mechanical | 20000 | |||
| Electrical | PV：1000 PVn：300 | ||||
| Inline methods | Can be up and down into the line | ||||
| Electrical accessories | |||||
| Auxiliary contact | □ | ||||
| Alarm contact | □ | ||||
| Shunt release | □ | ||||
| Applicable environmental conditions and installation | |||||
| Working temperature(℃) | -35~+70 | ||||
| Storage temperature(℃) | -40~+85 | ||||
| Moisture resistance | Category 2 | ||||
| Altitude(m) | Use with derating above 2000m | ||||
| Pollution degree | Level 3 | ||||
| Protection degree | IP20 | ||||
| Installation environment | Places without significant vibration and impact | ||||
| Installation category | Category III | ||||
| Installation method | DIN35 standard rail | ||||
| Wiring capacity | 2.5-50mm² | ||||
| Terminal torque | 3.5N·m | ||||
■ Standard □ Optional ─ No
| Tripping type | DC current | Initial state | Appointed time | Expected results |
| All types | 1.05In | Cold state | t≤2h | No tripping |
| 1.3In | Thermal state | t<2h | Tripping | |
| Ii=10In | 8In | Cold state | t≤0.2s | No tripping |
| 12In | t<0.2s | Tripping |
Applicable scenarios
The YCB8-125PV 1P DC MCB is engineered for large-scale solar farms and photovoltaic combiner boxes, providing DC 1000V/125A overload protection under extreme environmental conditions.
Key Functions:
Prevents reverse current damage in solar panel arrays
Ensures stable DC voltage output for inverters
Certified for high-temperature resistance (up to 70°C) in desert solar farms
Designed for heavy machinery and automated production lines, this DC miniature circuit breaker safeguards 48V/96V DC motor controllers and battery-powered industrial systems.
Key Functions:
Mitigates short-circuit risks in CNC equipment power modules
Compatible with UPS backup systems in manufacturing plants
Withstands vibration (IEC 60068-2-6) in harsh factory environments
Ensure uninterrupted operation of 5G communication towers and remote signal repeaters with YCB8-125PV’s dual protection against overloads and arc faults.
Key Functions:
Protects -48V DC power supplies in telecom cabinets
Reduces downtime caused by lightning surges
Operates reliably in high-humidity coastal areas
Frequently Asked Questions
Need help? Be sure to visit our support forums for answers to your questions!
Yes, YCB8125PV is designed for IP65-rated enclosures and can operate in -25°C to +70°C environments. It provides reliable DC circuit protection for outdoor solar panel arrays and combiner boxes. For specific installation guidelines, consult our technical manual or contact our support team.
Absolutely. YCB8125PV offers dual protection:
Thermal-magnetic tripping for overloads (125A max)
Instantaneous trip for short circuits (10kA breaking capacity @ DC 1000V)
Check these parameters:
System voltage ≤ DC 1000V
Continuous current ≤ 125A
Ambient temperature within -25°C to +70°C
For complex systems, our engineers provide free compatibility analysis
The standard model provides mechanical trip indication. For IoT integration (Modbus RTU/RS485), ask about our YCB8125PV-S smart version with digital status feedback.
It is physically compatible with standard 35mm DIN rails and has been tested with major brands’ DC busbars. For legacy systems, request our cross-brand compatibility report.
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