LSP Type 1+2 DC Surge Protector is designed for DC-side surge protection in photovoltaic systems. It is used in 600V, 1000V, and 1500V DC PV installations, including residential rooftop systems, commercial distributed PV plants, and utility-scale ground-mounted solar projects.
The device provides protection against lightning and switching surges in PV DC circuits through a coordinated multi-stage protection structure, enabling surge current discharge and overvoltage limitation. It supports system-level surge protection coordination and limits electrical stress on inverters, combiner boxes, and associated DC equipment under defined surge conditions.
All Type 1+2 DC SPDs are designed and tested in accordance with IEC/EN 61643-31 to ensure defined electrical performance under standardized surge conditions and to meet application requirements in photovoltaic systems.
Type 1+2
Surge Protection
10/350 μs & 8/20 μs Waveforms
DC-Side Installation
IEC / EN 61643-31
Type 1+2 DC Surge Protector is designed for the DC side of photovoltaic systems as a combined surge protection device, integrating both Type 1 (direct lightning) and Type 2 (induced surge) protection stages.The coordinated protection structure enables rapid surge current discharge and residual overvoltage limitation during lightning or surge events, effectively protecting critical PV system equipment and ensuring stable operation under photovoltaic DC operating conditions.
Type 1+2 DC Surge Protector is designed for photovoltaic DC surge protection systems, combining Type 1 and Type 2 protection in a MOV-based surge protection structure. It processes high-energy surge currents caused by direct and induced lightning through staged energy absorption and voltage clamping. The device limits residual overvoltage at each protection stage and supports insulation coordination between surge protection levels and PV system equipment in accordance with IEC 61643-31 requirements.
Type 1 Protection Stage
The Type 1 DC SPD handles high-energy lightning currents from direct strikes and diverts surge current to the earthing system in photovoltaic power systems.
Type 2 Protection Stage
The Type 2 DC SPD limits surge voltages caused by induced lightning or switching operations in DC electrical installations, reducing residual voltage to specified levels.
Coordinated Protection
This MOV-based PV DC surge protection structure enables voltage clamping and multi-stage energy control, supporting system operation in residential, commercial, and utility-scale solar installations under complex electromagnetic conditions.
Type 1+2 DC Surge Protector is designed for photovoltaic DC systems, providing service entrance and distribution-level surge protection in networks exposed to lightning currents and switching transients. This SPD also defines the application scope of PV DC systems and enables coordinated surge protection design across protection stages in accordance with IEC 61643-31 requirements.
In photovoltaic DC systems, surge protective devices are classified according to their surge handling capability, with each type corresponding to specific protection functions and application locations.
| SPD Type | Main Function | Surge Type |
| Type 1 | Discharge high-energy lightning current | Direct lightning surge |
| Type 2 | Limit transient overvoltage | Induced lightning and switching surges |
The Type 1+2 DC Surge Protector integrates both Type 1 and Type 2 protection functions in a single device, providing coordinated protection against direct and induced surge events in PV DC distribution systems.
10/350 µs waveform (Type 1)
The 10/350 µs waveform for Type 1, as specified in IEC 61643-11, is used to simulate direct lightning current characteristics. It is characterized by high current amplitude and long duration, and is mainly used to verify the lightning current withstand capability (Iimp) of the SPD.
8/20 µs waveform (Type 2)
The 8/20 µs waveform for Type 2, as specified in IEC 61643-11, is used to simulate surge currents caused by induced lightning or switching operations. It is mainly used to evaluate the nominal discharge current (In) and maximum discharge current (Imax), reflecting the current handling capability and voltage limiting performance of the SPD.
The modular design supports standardized DIN rail installation, enabling integration into DC distribution systems and facilitating maintenance.
| Parameter | Symbol | FLP-PV | FLP-PV-G |
| Maximum continuous operating voltage | Ucpv | 600 / 1000 / 1200 / 1500 V DC | 1000 / 1500 V DC |
| Lightning impulse current | Iimp | 6.25 kA (10/350 µs) | 6.25 kA (10/350 µs) |
| Nominal discharge current | In | 20 kA (8/20 µs) | 20 kA (8/20 µs) |
| Maximum discharge current | Imax | 40 kA (8/20 µs) | 40 kA (8/20 µs) |
| Voltage protection level | Up | ≤ 5.2 kV | ≤ 3.75 kV |
Type 1+2 DC Surge Protector provides coordinated surge protection in photovoltaic DC systems through thermal disconnection, MOV-based energy absorption, and integrates coordinated Type 1 and Type 2 surge protection stages. The design supports system-level surge protection against lightning and switching surges in high-voltage DC solar environments, in compliance with IEC 61643-31 standards.
Type 1+2 DC Surge Protector undergoes standardized electrical and environmental testing to verify surge current handling capability, voltage protection performance, and operational stability under lightning and switching surge conditions. All tests are designed in accordance with IEC 61643-31 requirements to ensure reliable performance in photovoltaic DC systems.
Type 1+2 DC Surge Protector is designed and type-tested according to IEC/EN 61643-31, the dedicated standard for DC surge protective devices used in photovoltaic and DC power systems. IEC/EN 61643-31 specifies the technical requirements, test procedures, and performance criteria for DC SPDs to ensure reliable surge protection in PV installations under lightning and switching surge conditions.
Parallel Connection – Installed at main DC distribution points such as PV combiner boxes or inverters to provide effective surge current diversion in PV DC systems.
Backup Protection – A DC circuit breaker or fuse is recommended upstream to support safe system operation.
DIN-Rail Mounting Compact design enables fast installation inside DC distribution panels.
Status Monitoring – Remote terminals enable continuous SPD status indication in PV DC systems.
Fault Indication – Provides early signal of failure or end-of-life conditions for maintenance planning.
Maintenance Support – Facilitates timely response while maintaining system operation in photovoltaic installations.
A Type 1+2 DC Surge Protector is used in photovoltaic DC systems to discharge lightning current and limit transient overvoltages caused by switching or grid disturbances. It provides coordinated DC surge protection for inverters, PV strings, and combiner boxes.
It is typically installed at key DC points such as PV combiner boxes, inverter DC inputs, or battery connection points. Installation close to the protected equipment helps reduce residual surge voltage in DC circuits.
They are typically designed and tested according to IEC 61643-11 and related PV surge protection standards. Compliance ensures defined performance under lightning impulse and switching surge conditions.
Copyright © 2010-2026 Wenzhou Arrester Electric Co., Ltd. All Rights Reserved.
