The DC Surge Protector 500V 2P is a Class II surge protector device for solar PV strings. Lightning and switching surges go to earth before they reach the inverter. Homeowners, farms and solar installers across South Africa fit it as a surge protector for solar panels. Find it in our AC/DC Protection Devices range.
Why Choose DC Surge Protector 500V 2P
- Guards PV strings against transient overvoltage.
- Clips onto a DIN rail in the DB board.
- Carries a 2-year warranty.
Key Specifications At A Glance
- Model: XLSPD-PV
- Hard Wiring Capacity: 4-25 mm²
- Flexible Wiring Capacity: 4-16 mm²
- Surge Protection Classification: Class II
- Nominal Discharge Current (In): 20kA (8/20 μs)
- Maximum Discharge Current (Imax): 40kA (8/20 μs)
- Certifications: CE, TÜV (Manufacturer Listed)
- Type: DC Surge Protector, Class II
- Poles: 2P
- Rated Voltage (Un): 500V DC
- Maximum Continuous Voltage (Uc): 650V DC
- Voltage Protection Level (Up): 3.8kV
- Protection Rating: IP40
- Mounting: 35mm DIN Rail
- Warrantee: 2 year
- Weight: 0.27 kg (270 g)
- Dimensions: 36 × 90 × 67.6 mm (W × H × D)
The unit is rated 500V DC, with a 650V DC maximum continuous voltage. Its 3.8kV voltage protection level limits the spike that passes through to the inverter.
Compatibility And Fit For Solar Strings
This unit protects the string side between the panels and the inverter’s PV input. Hybrid, off-grid and grid-tied inverters all suit it. It mounts inside one of our solar combiner boxes or a DB board.
Terminals take 4-25 mm² hard wiring and 4-16 mm² flexible wiring, so 6mm solar wire fits. Pair it with 1000VDC solar fuses and a 63A 2P DC circuit breaker in the same enclosure.
Check your string’s open-circuit voltage before you order, because it must stay below the 650V DC rating. Higher-voltage arrays need the 1000V 3P surge protector instead.
Each 2P unit protects one positive and negative pair. A 35mm DIN rail mount lets it share the rail with the fuses and breaker. AC mains surge protection needs a different device. Mounted in a DB board, this unit works as a DB surge protector for the PV side only.
Wiring And Earthing Steps
- Isolate the string with the DC breaker first.
- Land the positive and negative cables on the two poles.
- Connect the earth terminal to the earth bar.
- Confirm polarity before you close the breaker.
Run a short, straight earth lead, since a long looped cable weakens the protection. A 1.2m earth spike gives the system a solid path to ground.
Best Use Cases For PV Arrays
- Homeowners protecting a rooftop hybrid system.
- Farms with long cable runs to ground-mounted arrays.
- Installers ticking off a compliance checklist.
Off-grid properties and smallholdings face higher surge exposure on long runs, so DC surge protection matters there. Businesses often add this solar surge protector after a lightning storm or a new installation. Explore the wider switchgear and protection range for matching parts.
Warranty Compliance And Trust
Each unit carries a 2-year warranty. Installers must fit surge protection and earthing to SANS 10142-1 under the electrical installation regulations. A registered person then issues the Certificate of Compliance after commissioning.
The IEC 61643-31 standard covers surge protective devices on the PV DC side. Grid-tied systems also need SSEG registration with your local municipality.
We bring 13 years of experience and 500+ completed projects. Expect nationwide delivery in 2 to 5 working days. Collect stock at our Midrand, Bloemfontein, Cape Town, Durban or Gqeberha pickup points.
Pay by EFT, card, cash or PayFast, with a 7-day return period. Our professional solar installation team can fit it for you. We include expert system sizing, so your quote matches protection to each string. Installations include a 12-month workmanship warranty, confirmed with your quote.
Frequently Asked Questions
What does DC surge protection do?
DC surge protection diverts lightning and switching spikes to earth. That keeps the surge away from the inverter’s PV input and the panels.
Is the DC Surge Protector 500V 2P weatherproof?
No, its IP40 rating suits indoor or enclosed use only. Mount it inside a sealed combiner box or DB board, away from rain and dust.
Why does a surge protector need a good earth?
Surge current must reach ground fast. Every loop in a long earth lead adds resistance, so more of the spike reaches the inverter.
What string voltage suits this unit?
Open-circuit voltage on the string must stay below 650V DC. Choosing the wrong rating leaves the inverter exposed or damages the protector itself.
Find more answers on our solar FAQ page.
Order the DC Surge Protector 500V 2P or request a free solar quote today. Contact our sales team to check stock.
Last Updated: October 2026
