Direct answer
A solar DC circuit breaker protects DC circuits in PV systems. Selection depends on system voltage, current, pole count, breaking capacity and whether the breaker is used on a string, combiner output or feeder.
DC breaker selection should not copy AC breaker logic. DC arc behavior and voltage rating are the first checks.
Core procurement parameters
| Voltage class | 500V / 1000V / 1500V DC by model |
|---|---|
| Current range | Small MCB range to higher MCCB frames |
| Pole count | Project-specific DC wiring layout |
| Use position | String, combiner output, inverter DC input |
Applications
- PV string circuits
- Combiner box outputs
- Inverter DC inputs
- Solar DC distribution panels
Available options
- DC MCB
- DC MCCB
- Mounted inside combiner box
- Loose component supply
QC points before shipment
Check DC voltage marking
Confirm current and pole count
Review terminal size
Inspect product label and carton
FAQ
Can AC breakers be used for solar DC circuits?
No. Solar DC circuits require devices rated for DC voltage and DC interruption behavior.
Should I choose DC MCB or DC MCCB?
MCBs suit smaller circuits. MCCBs are used for higher-current outputs and feeders.