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DC Cables, Connectors & SPD
3 Product Series · 8 Models available
The DC side of a PV plant is only as reliable as the cables, connectors and surge protection that carry its current. QDTB supplies the complete DC balance-of-system — double-insulated PV1-F cables rated to 1500 V DC, weatherproof MC4-compatible connectors, and Type 2 surge protective devices for the array and inverter. Cable cross-sections are sized to the string current and voltage drop, connectors are IP68-rated against moisture and dust, and SPDs clamp lightning and switching surges before they reach the inverter. Selecting these three components as a matched set avoids the compatibility and derating failures that plague mixed-brand installations.
Specifications Range
All specifications and dimensions can be customized upon request
| Key parameters | Model Range |
|---|---|
| Rated Voltage | 1500 V |
| Cross-Section | 4 mm², 6 mm², 10 mm² |
| Temperature Range | -40~+90 |
| Rated current (A) | 30 A, 50 A |
| Rated Voltage | 1500 V |
| Rated Voltage | 600 V, 1000 V, 1500 V |
| Nominal Discharge Current | 20 kA |
| Max Discharge Current | 40 kA |
| Protection Mode | Positive/negative to ground |
| Type | DC cable, MC4 connector, Surge protector (SPD) |
| Key Spec | 4 mm² · 1500 V, 6 mm² · 1500 V, 10 mm² · 1500 V, 30 A · 1500 V, 50 A · 1500 V, Imax 40 kA · 600 V… |
| Standard | EN 50618, IEC 62852, IEC 61643-31 |
Available Series
DC-Cable
→DC-Cable Series — PV1-F Double-Insulated Cables
PV1-F double-insulated cables rated to 1500 V DC for string interconnection and long DC runs, with UV- and weather-resistant sheaths for decades of outdoor service.
MC4-Connector
→MC4-Connector Series — Weatherproof PV Connectors
MC4-compatible connectors sealed to IP68 for reliable string mating in rain, dust and coastal environments, rated for 1500 V DC.
SPD
→SPD Series — Type 2 Surge Protective Devices
Type 2 surge protective devices for the PV array and inverter, clamping induced lightning and switching surges before they damage electronics.
Application Scenarios
String Interconnection
PV1-F cables and MC4 connectors linking modules into strings and strings to the inverter.
Long DC Runs
Correctly sized cable cross-sections keep voltage drop and resistive loss within design limits.
Lightning-Prone Sites
Type 2 SPDs at the array and inverter clamp induced surges before they damage electronics.
Harsh Environments
UV-stable, double-insulated cables and IP68 connectors for desert, coastal and high-UV sites.
Ground-Mount & Rooftop
Trunk and drop cabling layouts for both large ground arrays and distributed rooftops.
Retrofit & Repair
Standard-compatible connectors that mate with existing MC4-style systems.
Technical Advantages
1500 V DC Rating
Cables and connectors rated for modern 1500 V strings with full safety margin.
Double-Insulated Cable
PV1-F construction with UV- and weather-resistant sheath for decades of outdoor life.
IP68 Connectors
MC4-compatible connectors sealed against water and dust, with reliable snap-lock mating.
Type 2 Surge Protection
SPDs sized to clamp induced lightning and switching surges at the array and inverter.
Frequently Asked Questions
Why choose PV1-F cable over ordinary wire?
PV1-F is double-insulated, UV-resistant and rated for 1500 V DC continuous outdoor use, unlike general building wire.
What is the difference between Type 1 and Type 2 SPDs?
Type 1 handles direct lightning strikes at the service entrance; Type 2 clamps induced surges at distribution points such as the array and inverter.
Are the connectors compatible with standard MC4?
Yes, our connectors follow the MC4 interface and mate reliably with standard PV connectors.
How do I size the DC cable?
The cross-section must keep voltage drop within about 1–2 % at the string's maximum current, accounting for cable length and ambient temperature.
Where should surge protection be installed?
At the DC array combiner and at the inverter DC input, plus AC-side SPDs at the point of grid connection.
What is the minimum order quantity (MOQ) for DC Cables, Connectors & SPD?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.
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All specifications and dimensions can be customized upon request
Type 1 vs Type 2 vs Combined SPD: How to Choose
| Type 1 SPD | Type 2 SPD | Type 1+2 Combined | |
|---|---|---|---|
| Surge handled | Direct lightning strike current at the service entrance | Induced surges from switching and distant strikes | Both, in one device |
| Location | At the point where the array or service enters the building | At the array combiner and the inverter DC input | Where both duties fall on the same point |
| Residual voltage | Higher, because the device must survive the strike | Low, which is what the inverter needs | Low, with the strike rating retained |
| Coordination | First stage, feeding the downstream Type 2 | Second stage, close to the protected equipment | Replaces the two stages at that point |
| Cost | Highest per device | Lowest, so it is fitted at more points | Between the two |
| Code basis | Required where a lightning protection system exists | Standard practice on PV arrays and inverters | Used where space allows only one device |
| Typical application | Lightning-prone sites and exposed ground plants | Array combiners and inverter DC inputs | Compact stations and retrofit cabinets |
Where QDTB® DC Cables, Connectors & SPD Are Specified
The DC side of a PV plant is where most field failures start, so these components are specified together rather than from three different suppliers. PV1-F cable is double-insulated, UV-resistant and rated for 1500 V DC, which is what lets it run exposed on a roof or between rows for the life of the plant.
Long DC runs are where cable sizing actually earns its keep: the cross-section has to hold voltage drop within about 1-2 % at the string's maximum current, otherwise the loss is paid every day for decades. IP68 connectors keep moisture and dust out of the joint that would otherwise corrode and heat.
Lightning-prone and exposed ground plants specify surge protection at the array combiner and at the inverter DC input, plus AC-side SPDs at the point of grid connection. Type 1 devices go where a lightning protection system is installed, and Type 2 devices clamp the induced surges closer to the equipment.
The set is matched to IEC 62852 for connectors, EN 50618 for cable and IEC 61643-31 for PV surge protection. Sourcing them as one matched set is what avoids the compatibility and derating failures of mixed-brand installations.
Frequently Asked Questions
Why choose PV1-F cable over ordinary wire?
PV1-F is double-insulated, UV-resistant and rated for 1500 V DC continuous outdoor use, unlike general building wire.
What is the difference between Type 1 and Type 2 SPDs?
Type 1 handles direct lightning strikes at the service entrance; Type 2 clamps induced surges at distribution points such as the array and inverter.
Are the connectors compatible with standard MC4?
Yes, our connectors follow the MC4 interface and mate reliably with standard PV connectors.
How do I size the DC cable?
The cross-section must keep voltage drop within about 1–2 % at the string's maximum current, accounting for cable length and ambient temperature.
Where should surge protection be installed?
At the DC array combiner and at the inverter DC input, plus AC-side SPDs at the point of grid connection.
What is the minimum order quantity (MOQ) for DC Cables, Connectors & SPD?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.