EXD1 Photovoltaic DC Disconnect Switch
EXU3DC-II is a Type II DC surge protection device (SPD) designed for photovoltaic (PV) DC power systems, rated for 800V / 1000V / 1200VDC. It provides 20kA nominal discharge current (In) and up to 40kA maximum surge capacity (Imax). Designed for protection against lightning-induced and switching surges in solar PV arrays and DC combiner systems. Available in 2P / 3P configurations with DIN rail mounting. Replaceable module design with visual fault indication and remote signaling contact for maintenance monitoring. Compliant with IEC 61643-1, CE, CQC, and TUV standards. Suitable for rooftop and utility-scale PV systems.
Standards: IEC 61643-1, CE, CQC, TUV, ROHS
Rated Voltage: 800V / 1000V / 1200V DC
Nominal Discharge Current: 20kA
Max Discharge Current: 40kA
Poles: 2P / 3P
Features: Replaceable module, visual status indicator, remote signaling
Applications: PV combiner box, inverter DC protection, solar power systems
Product Information
The HUYU Electric EXU3DC-II T2 is a fast, modular, and solar-PV-specific DC surge protection device.
The EXU3DC-II series from HUYU Electric is a Type II DC Surge Protective Device specifically engineered for photovoltaic (PV) DC electrical systems, designed to protect solar installations from transient over-voltage and surge currents caused by lightning strikes and grid switching operations.
It supports a maximum operating voltage of 800V / 1000V / 1200V DC, covering residential, commercial, and utility-scale photovoltaic string configurations used in modern solar energy systems.
With a nominal discharge current (In) of 20kA and a maximum surge discharge capacity (Imax) of 40kA, it provides robust surge protection for rooftop solar systems and ground-mounted PV plants.
With its replaceable module design, built-in visual fault indication, and remote signaling contacts, maintenance personnel can easily monitor device status without opening the enclosure.
The response time is under 25 nanoseconds, ensuring ultra-fast clamping of transient surge events before they reach sensitive inverter electronics.
The EXU3DC-II is certified to IEC 61643-1 and CQC / TUV, ensuring full compliance with international photovoltaic surge protection standards.
HUYU Electric provides factory-direct OEM/ODM support with complete technical documentation for solar EPC contractors, distributors, and PV system integrators.
Technical Data
| Parameter | EXU3DC-II/2P | EXU3DC-II/3P |
|---|---|---|
| Max. Continuous Operating Voltage | 800V / 1000V / 1200V DC | |
| Nominal Discharge Current (In) | 20kA | |
| Maximum Discharge Current (Imax) | 40kA | |
| Voltage Protection Level (Up) | 3.2kV / 4.0kV / 4.4kV | |
| Response Time | ≤25ns | |
| Max. Backup Fuse | 125A gL/gG | |
| Operating Temperature | -40°C to +80°C | |
| Remote Signaling Contact | Switching contact (250V/0.5A, 125V/0.2A, 75V/0.5A) | |
| Casing Material | Thermoplastic UL94-V0 flame-retardant housing | |
| Certifications | CE, CQC, TUV, ROHS, ISO9001 | |
| Mounting | 35mm DIN rail | |
| MOQ | Project-based quotation required | |
The EXU3DC-II comes in either 2P or 3P configuration for different PV system architectures. 2P protects positive and negative DC lines, while 3P supports additional grounding or bipolar system design.
Due to its quick-replace module design, only damaged modules need replacement, significantly reducing maintenance downtime.
The device supports wiring up to 25mm² solid and 35mm² flexible conductors, suitable for standard PV combiner box installations.
Protection for Solar PV DC Systems
PV systems are highly exposed to lightning-induced and switching surges, especially in rooftop and ground-mounted installations.
The EXU3DC-II SPD suppresses transient over-voltage within 25 nanoseconds and safely diverts surge energy to ground.
It includes a thermal disconnect mechanism and real-time visual + remote signaling for safe operation monitoring.
Request a Quotation for EXU3DC-II DC Surge Protective Devices
800V/1000V/1200V DC Type II SPD, 40kA Imax, ≤25ns response, replaceable module with remote monitoring. Suitable for PV combiner box and inverter protection.
IEC 61643-1 Certified • OEM/ODM Available • Global PV Applications
OEM/ODM Supply – Certified DC Surge Protection for PV Systems
EXU3DC-II – Reliable, Replaceable, and Smart Monitored PV SPD Solution
The EXU3DC-II DC SPD is designed for long-term photovoltaic system protection with high reliability and fast fault response.
Integrated visual indicators and remote signaling contacts allow immediate failure detection and system safety improvement.
This product is ideal for EPC contractors, PV distributors, and combiner box manufacturers requiring IEC-certified surge protection.
How to Select a DC SPD for Your Solar PV System
Key selection factors for EXU3DC-II photovoltaic surge protection devices.
Voltage Selection
800V / 1000V / 1200V based on PV string design.
Configuration
2P for standard PV strings, 3P for advanced grounding systems.
Protection Coordination
Use 125A gL/gG backup fuse for safe disconnection.
Installation
Install close to inverter or combiner box with <0.5m wiring.
Frequently Asked Questions
What is DC SPD?
A DC SPD is a surge protection device used to protect photovoltaic DC circuits from lightning and switching surges.
AC vs DC SPD difference?
DC SPD must extinguish arcs without zero-crossing, unlike AC SPD which relies on AC waveform zero-crossing.
Installation method?
Install in PV combiner box or inverter DC input with proper grounding and short wiring.
Outdoor use?
Yes, designed for outdoor PV environments with proper enclosure protection.
