1000V DC Surge Protective Device 20KA–40KA for Solar PV Systems

1000V DC Surge Protective Device (SPD) for Solar PV Systems

Protect your solar photovoltaic investment with this heavy-duty DC Surge Protective Device (SPD). Rated up to 1000V DC with a nominal discharge current of 20KA and a maximum discharge current of 40KA, this unit is engineered to shield solar panels, inverters, and converters from damaging voltage transients caused by lightning strikes and switching surges. Available in 2-pole (2P) and 3-pole (3P) configurations to suit a wide range of DC network layouts.

Key Features

• Wide Voltage Rating: Max. continuous operating voltage of 1000V DC — ideal for modern high-voltage solar PV arrays.
• High Discharge Capacity: Nominal discharge current 20KA; maximum discharge current 40KA for robust surge management.
• Dual-Mode Protection: Provides both common-mode and differential-mode protection when installed in parallel on DC networks.
• High-Energy MOV Technology: Metal oxide varistors (MOVs) equipped with thermal disconnectors and built-in failure indicators for fast, reliable response.
• Safe Creepage Distance: 10mm creepage distance meets strict safety standards for high-voltage DC applications.
• Standards & Certifications: Compliant with IEC61643-31; certified CE, CB, TUV, and RoHS.
• Flexible Installation: Designed for parallel installation at both ends of the DC power supply line — solar panel side and inverter/converter side — especially for long external cable runs.
• Made in China.

Specifications

Installation Guide

Install this SPD in parallel on the DC network to be protected. For best results, place units at both ends of the DC supply line — one at the solar panel array side and one at the inverter or converter side. This approach is especially important when cable routing is external or spans a long distance, maximising protection across the entire DC circuit.

What's in the Box

• 1× DC Surge Protective Device (SPD)

Please Note: Due to screen color variations, the actual product color may differ slightly from images. Please allow ±1mm measurement tolerances.

For more information on surge protection best practices and electrical safety in photovoltaic systems, visit the U.S. Department of Energy – Solar Energy Resources.

Frequently Asked Questions

Q: What is a DC Surge Protective Device (SPD) and why do I need one for my solar PV system?

A: A DC SPD is a device installed on your solar PV system's DC wiring to divert sudden voltage spikes — caused by lightning, grid switching, or other transient events — safely to ground before they can reach and damage your panels, inverter, or converter. Installing an SPD on both ends of your DC line significantly extends the lifespan of your solar equipment.

Q: What is the difference between the 2P and 3P configurations?

A: The 2-pole (2P) version protects two conductors (positive and negative), making it suitable for standard two-wire DC solar circuits. The 3-pole (3P) version adds protection for a third conductor, which is useful in certain grounded or mid-point referenced PV systems where three-wire protection is required.

Q: What do "20KA nominal" and "40KA maximum" discharge current ratings mean?

A: The nominal discharge current (20KA) is the standard surge level the SPD is tested and rated to handle repeatedly. The maximum discharge current (40KA) is the single-event peak surge the device can withstand without failing. Together these ratings indicate the SPD can handle both frequent smaller surges and rare, large lightning-induced events.

Q: Is this SPD compatible with my inverter brand?

A: Yes — this SPD is designed for universal DC network installation and is compatible with virtually all grid-tie and off-grid solar inverters rated up to 1000V DC. Simply install it in parallel on your DC wiring between the solar array and the inverter, following your inverter manufacturer's wiring guidelines and local electrical codes.