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PV Combiner Box (500V/1000V DC)
Fuse + SPD + Isolator/Breaker in one outdoor IP65/66 enclosure for safe, fast string aggregation.
- Configurable strings & outputs for utility and C&I rooftops
- Pre-wired options to cut on-site wiring time
- Tested to IEC/UL; UV-resistant, field-ready build
Product Range — HS & HD Series
Choose a model below. Use filters (Strings / Outputs / Switch Type) to refine.
Popular searches:
2 string PV combiner box ·
3 string PV combiner box ·
4 string PV combiner box ·
6 string PV combiner box ·
PV combiner box 2 in 1 out
HS — Fuse + SPD + Switch Disconnector
HS SeriesHS-1/1
1 IN 1 OUT
HS SeriesHS-2/1
2 IN 1 OUT
HS SeriesHS-3/1
3 IN 1 OUT
HS SeriesHS-2/2
2 IN 2 OUT
HS SeriesHS-4/2
4 IN 2 OUT
HS SeriesHS-6/2
6 IN 2 OUT
HD — Fuse + SPD + Breaker/MCB
HD SeriesHD-1/1
1 IN 1 OUT
HD SeriesHD-2/1
2 IN 1 OUT
HD SeriesHD-3/1
3 IN 1 OUT
HD SeriesHD-2/2
2 IN 2 OUT
HD SeriesHD-4/2
4 IN 2 OUT
HD SeriesHD-6/2
6 IN 2 OUT
Protection Stack — Fuse • SPD • Disconnector • Enclosure
What each component does and why it matters for safety, uptime and serviceability.
Provides string-level overcurrent protection. Limits fault energy and isolates a faulted string to keep the rest of the array online.
Typical: 10×38 mmClamps lightning- or switching-induced surges to protect downstream equipment. Coordinated with fuse for safe disconnection under fault.
Type II (or I+II)Enables safe load-break isolation and maintenance. HS uses a DC disconnector; HD integrates a breaker/MCB for trip indication and reset.
Load-break DC ratedUV-resistant, outdoor-rated enclosure with cable glands or MC4 entries. Keeps dust and water out for long-term reliability.
IP65/66 classStandards and ratings may vary by model; see each product page for exact specs.
Need help choosing a model?
Tell us your string count, outputs, and site voltage — we’ll recommend the right HS or HD combiner.
Sizing with verified wiring diagrams.
Protection stack matched to your inverter and standards.
Lead time & shipping options for your region.
What is a PV Combiner Box?
A PV combiner box aggregates multiple DC strings into one or more outputs and integrates protection and isolation. It improves safety, uptime, and makes installation & service faster.
Why it matters
- String aggregation reduces cable runs and simplifies layout.
- Integrated protection limits fault energy and protects downstream equipment.
- Built-in isolation enables safe maintenance and rapid troubleshooting.
- Factory pre-wired options shorten install time and improve consistency.
What’s inside
-
DC Fuse (gPV) — string-level overcurrent protection; coordinates with SPD.
-
DC SPD — clamps transient surges (Type II or I+II) to protect inverter & wiring.
-
Switch Disconnector / MCB — load-break isolation; trip indication on MCB types.
-
Waterproof Distribution Box — outdoor-rated enclosure with glands/MC4 entries.
See model pages for ratings and wiring diagrams.
Where it’s used
- Residential rooftop (1–2 strings)
- Commercial & industrial rooftops (2–6 strings)
- Ground-mount arrays and carports
- Retrofits that require standardized protection & isolation
Install & service
- Label strings clearly; keep cable routing tidy and strain-relieved.
- Bond enclosure to earth; verify torque on fuse holders, SPD, and terminals.
- Check polarity and insulation resistance before energizing.
- Record I–V and protection settings for future maintenance.
Need help choosing a model? See the grid above or contact us for application sizing.
Applications & Use Cases
Where PV combiner boxes fit best. Click any tile to explore models.
Residential
Residential
Residential
Commercial & Industrial
Commercial & Industrial
Commercial & Industrial
Ground-mount
Ground-mount
Ground-mount
Carports
Carports
Carports
Rooftop array 1–2 strings
Residential
Technician install Compact footprint
Residential
Eco-friendly home Pre-wired options
Commercial & Industrial
Large rooftop 2–6 strings
Commercial & Industrial
Factory array Multiple outputs
Commercial & Industrial
Industrial roof Higher power density
Ground-mount
Solar field Centralized runs
Ground-mount
Long rows Optimized stringing
Ground-mount
Utility scale Feeder combiner
Carports
Parking canopies EV-ready sites
Carports
Aerial view Shaded parking
Carports
Charging bays Cable management
Application Guidance — When to choose HS vs HD
Quick tips by site type: typical string counts, outputs, switchgear preference, and enclosure notes.
Residential rooftops
1–2 strings
1 output
For compact arrays or hybrid inverter homes, HD is often preferred for the breaker/MCB convenience (trip indication & reset). Choose HS if a dedicated DC isolator is required by local spec. Enclosures: IP65/66.
Explore models in the grid above.
Commercial & industrial
rooftops
rooftops
2–6 strings
1–2 outputs
For multi-MPPT inverters and higher power density, HS (with disconnector) is commonly specified; HD fits sites that prefer an integrated breaker/MCB. Pre-wired / pre-assembled options reduce install time.
Typical: select models based on strings and outputs.
Ground-mount solar farms
2–6 strings
feeder combiner
Long runs benefit from centralized HS combiners. For utility-scale feeders, verify protection class and cable sizing. IP66 enclosure helps in harsh environments.
See the Protection Stack for standards, then pick models.
Solar carports & parking
2–4 strings
1–2 outputs
Weather-exposed structures often use IP66 boxes. Choose HD for breaker reset convenience, or HS where an isolator is mandated. Works for off-grid EV canopies as well.
Browse models or email sales for sizing.
Why Choose Us
Factory direct supply, fast delivery, engineering support, and flexible customization for PV combiner boxes.
Factory-direct & reliable supply
Stable production and consistent quality with friendly MOQs for pilot runs and scale-ups.
- Pre-wired assemblies available
- Spare parts stocked (fuse links, SPD modules, switches)
Sizing & wiring guidance
Tell us your string count, outputs, and site voltage — we’ll recommend HS or HD models and share wiring diagrams.
- Specs & wiring diagrams
- Protection-stack coordination (gPV fuse / DC SPD / isolator or MCB)
- Quick responses with clear docs
Fast lead time & flexible logistics
Component inventory and pre-assembly shorten delivery. Global shipping by sea, air, or express.
- Flexible MOQ for trials
- Packed with clear labeling & docs
OEM / ODM customization
Private label and custom layouts to match your inverter and site standards.
- Strings/outputs mapping & enclosure sizing
- Labeling layout and pre-wired options
Robust build & easy service
Clear internal layout and replaceable protection modules minimize downtime at site.
- Service kits & documentation on request
- Spare parts continuity across HS / HD families
Technical & Resources
Datasheets, wiring notes, installation guidance, and standards relevant to PV combiner boxes.
Datasheets & Wiring Diagrams
Each HS/HD model provides a full specification sheet with torque settings and rated values. Wiring diagrams show string inputs, fuse positions, SPD location, and the isolator/breaker layout.
- Open any model card in SEC2 Product Range and click “Specs & wiring”.
- Background documents: DC Fuse (gPV), DC SPD, DC Switch Disconnector, DC Breaker/MCB.
Installation Guide
- Mounting: fix the enclosure on wall/rack/backplate; confirm outdoor rating (IP65/66).
- Wiring: route strings via glands; tighten terminals to rated torque; follow polarity labels.
- Bonding & Grounding: connect protective earth; verify continuity to fuse holders, SPD, and chassis.
- Verification: record I–V data; check SPD indicators; test disconnector/breaker operation before energizing.
Commissioning tip: follow IEC 62446 recommendations for documentation and testing.
Service & Maintenance
- Fuses: replace blown gPV 10×38 mm (or rated equivalent) only.
- SPDs: check visual status; replace pluggable cartridges if tripped.
- Switch/MCB: operate periodically (no-load) to keep contacts clean; confirm trip/reset on MCB types.
- Enclosure: inspect seals, glands, labels; clean surface and verify ingress protection.
Recommended interval: every 6–12 months or after severe weather events.
Standards & References
Commonly referenced documents for PV combiner boxes and components:
- IEC 60269-6 — gPV fuse links
- IEC 61643-31 — DC surge protective devices
- IEC 60947-3 — switch disconnectors
- IEC 61439-2 — low-voltage switchgear assemblies
- UL 1741 / UL 508A — applicable for certain North America builds
External links: IEC Webstore · UL Standards
Need help choosing a model?
Tell us your string count, outputs (1 or 2), array voltage, cable length, and site standards — we’ll recommend the right HS or HD PV combiner box with verified wiring diagrams.
- Sizing with verified wiring diagrams.
- Protection stack matched to your inverter and standards.
- Lead time & shipping options for your region.
FAQ
Common questions about PV combiner boxes, selection, and maintenance.
What is a PV combiner box and why do I need it?
A solar PV combiner box (also called a PV combiner box) merges multiple DC strings into one or two outputs, integrates protection (gPV fuses, DC SPD) and isolation (disconnector/MCB), and provides a safe service point. It reduces field faults and simplifies commissioning.
Browse models in SEC2 Product Range.
What’s the difference between HS and HD series?
HS integrates a DC switch disconnector (per IEC 60947-3) with Fuse + SPD; HD uses a breaker/MCB with Fuse + SPD. Choose based on isolation preference, trip indication needs, and site standards.
Learn more: DC Disconnector · DC Breaker/MCB.
How do “X in Y out” and “X string” naming relate?
Which voltage ratings are supported?
Typical builds support 1000 V DC and 1500 V DC. Final selection depends on array open-circuit voltage (VOC) and inverter DC limits. We can verify for your project at /contact-us.
What protection devices are inside?
A standard stack includes gPV fuses (string over-current), DC SPD (surge protection), and a main isolator or DC breaker for safe maintenance.
Deep dives: /dc-fuse · /dc-spd · /dc-disconnector · /dc-breaker.
How do I choose between 1 or 2 outputs?
Use 1 output for a single MPPT or single DC input. Select 2 outputs (e.g., 2 in 2 out, 4 in 2 out) for dual-MPPT inverters or when split runs reduce cable loss.
Can I mix different string currents or lengths?
Best practice is symmetrical strings (same module count/orientation). If mixing is unavoidable, size fuses for the highest backfeed current and confirm SPD UCPV margin to array voltage.
How are fuses and SPDs maintained?
gPV fuses are field-replaceable. SPDs have visual indicators and, on many builds, pluggable cartridges. Inspect during inverter service windows and after severe weather.
Do you provide wiring diagrams and labels?
Yes. Each model’s “Specs & wiring” anchor includes diagrams, torque values, labeling, and tightening sequence. Start from SEC2 Product Range or contact us for project files.
Where can I learn about the standards you reference?
See IEC Webstore for IEC 60269-6, 61643-31, 60947-3, 61439-2. For North America builds, consult UL Standards.
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