Direct answer
A DC surge protection device helps protect PV DC circuits from transient overvoltage. It is commonly installed inside combiner boxes, DC distribution boxes or near inverter inputs.
SPD selection depends on system voltage, lightning exposure, earthing design and whether the project needs Type 2 or Type 1+2 protection.
Core procurement parameters
| Device type | Type 2 or Type 1+2 by project requirement |
|---|---|
| Voltage class | 600V / 1000V / 1500V DC options |
| Mounting | DIN rail inside enclosure or combiner box |
| Service need | Pluggable module and status window options |
Applications
- PV combiner boxes
- Inverter DC inputs
- Rooftop DC protection boxes
- Ground plant DC cabinets
Available options
- Type 2 DC SPD
- Type 1+2 DC SPD
- Remote signal contact
- Pre-wired combiner assembly
QC points before shipment
Check SPD voltage rating
Confirm type and pole configuration
Inspect module fit
Review wiring layout in enclosure
FAQ
Where is a DC SPD installed in a PV system?
It is usually installed in a combiner box, DC protection box or near inverter DC input depending on layout.
Is Type 2 SPD enough for every project?
Not always. Lightning exposure and local requirements decide whether Type 1+2 is needed.