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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.
Instant Selection & Quote Calculator
Select your specifications to get an estimated price instantly.
| Base price (interpolation) | $5 |
| × Product factor | ×1.0000 |
| × Country factor | ×1.0000 |
| × Copper-linked factor | ×1.0000 |
| + Options / accessories | $0 |
Complete equipment — no winding copper linkage
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Need help?
All specifications and dimensions can be customized upon request