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DC Solar MCCB Molded Case Circuit Breaker 1P/2P/4P DC500V/1000V 125A/250A Overload Protection for Solar PV Systems
DC Solar MCCB Molded Case Circuit Breaker 1P/2P/4P DC500V/1000V 125A/250A Overload Protection for Solar PV Systems
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DC Solar Molded Case Circuit Breaker (MCCB) — 1P/2P/4P DC500V/1000V 125A/250A
Protect your solar PV investment with a purpose-built DC molded case circuit breaker (MCCB) rated for the high-voltage DC environments of photovoltaic systems. Unlike standard AC circuit breakers, these DC-rated MCCBs are engineered to interrupt DC arc faults — the most dangerous and difficult-to-extinguish fault type in solar installations. Available in 1P, 2P, and 4P configurations for DC 500V and DC 1000V systems, with 125A and 250A current ratings to match your system capacity.
Model Specifications
| Model | Poles | Rated Voltage | Rated Current | Application |
|---|---|---|---|---|
| DG1-125 | 1P / 2P / 4P | DC 500V | 125A | Small to medium solar PV arrays |
| DG1-250 | 1P / 2P / 4P | DC 1000V | 250A | Large-scale solar PV systems |
General Specifications
| Type | Molded Case Circuit Breaker (MCCB) |
| Application | Solar PV DC systems |
| Rated Voltage | DC 500V / DC 1000V |
| Rated Current | 125A / 250A |
| Pole Configuration | 1P / 2P / 4P |
| Protection | Overload + Short-circuit protection |
| Certification | CE |
| Smart Device | No (manual operation) |
| Origin | Mainland China |
Why DC-Rated MCCBs Are Essential for Solar PV
Standard AC circuit breakers cannot safely interrupt DC faults. DC current does not have the natural zero-crossing that AC current does, making DC arcs self-sustaining and extremely dangerous. DC-rated MCCBs use specialized arc-quenching chambers designed specifically for DC interruption, ensuring safe and reliable fault clearing in solar PV string and array circuits.
Why Choose This MCCB?
- ✅ DC-rated design — purpose-built for solar PV DC circuits, not repurposed AC breakers
- ✅ Dual voltage options — DC500V for standard systems, DC1000V for high-voltage string configurations
- ✅ High current ratings — 125A and 250A cover small residential to large commercial solar arrays
- ✅ Multiple pole configurations — 1P, 2P, and 4P for flexible system design
- ✅ Overload + short-circuit protection — dual protection mechanism for comprehensive system safety
- ✅ CE certified — meets European electrical safety standards
- ✅ Molded case construction — robust housing for industrial and outdoor electrical panel installation
Pole Configuration Guide
| Poles | Use Case |
|---|---|
| 1P | Single positive or negative conductor protection |
| 2P | Both positive and negative conductors (standard solar string protection) |
| 4P | Multi-string or three-phase inverter DC input protection |
Common Applications
- Solar PV string combiner box protection
- DC main disconnect between solar array and inverter
- Battery storage system DC protection
- Off-grid solar system main breaker
- Commercial and industrial solar array protection
- EV charging station DC circuit protection
Frequently Asked Questions
Q: Can I use a standard AC MCCB for my solar system?
A: No. Standard AC MCCBs are not rated for DC interruption and may fail to clear DC faults safely, creating fire and electrocution hazards. Always use DC-rated breakers in solar PV applications.
Q: How do I select the correct pole count?
A: For standard two-wire solar string circuits, use a 2P breaker to protect both positive and negative conductors. For grounded systems where only one conductor is switched, a 1P breaker may be used on the ungrounded conductor.
Q: What is the difference between DG1-125 and DG1-250?
A: DG1-125 is rated for DC 500V / 125A — suitable for smaller residential and commercial systems. DG1-250 is rated for DC 1000V / 250A — designed for larger high-voltage string systems and commercial-scale installations.
Package Contents
- 1× DC Solar MCCB Circuit Breaker (model and pole count as selected)
