LDSP1s6.25 Type 1+2 DC SPD for 600–1500V Solar PV Systems

LDSP1s6.25 Type 1+2 DC SPD for 600–1500V Solar PV Systems

The LDSP1s6.25 is intended for DC applications where both lightning impulse current and switching or induced surge protection need to be considered.

Unlike a standard Type 2 solar SPD that is specified mainly by In and Imax under an 8/20 μs waveform, this Type 1+2 series also carries an Iimp rating based on a 10/350 μs impulse waveform. That makes Iimp an important parameter when comparing the LDSP1s6.25 with conventional Type 2 DC surge protection devices.

The series covers several photovoltaic system voltages while keeping the same basic 3+0 product platform. Iimp, Itotal and Up vary by voltage model, so the correct version should be selected from the actual Ucpv and required protection level rather than by Imax alone.

Key Features

• Type 1+2 surge protection for DC photovoltaic systems

• Ucpv options from 600V to 1500V DC

• In 20kA and Imax 50kA under an 8/20 μs waveform

• Model-specific Iimp ratings under a 10/350 μs waveform

• 3+0 protection configuration

• High-energy MOV voltage-limiting technology

• Pluggable protective modules

• Internal thermal disconnection device

• Green/red operating and fault indication

• Optional remote signalling contact

• Short-circuit current rating, Iscpv: 10kA

• Maximum 125A gPV backup fuse

• 35mm DIN-rail installation

• IP20 thermoplastic enclosure

• Screw terminals for 2.5–25mm² conductors

Technical Specifications

Model Selection by Ucpv and Iimp

The LDSP1s6.25 series should be selected by looking at Ucpv, Iimp and Up together.

Although every model has an In rating of 20kA and an Imax rating of 50kA, the impulse discharge capability changes as the DC voltage increases.

For buyers comparing several solar SPD models, this table is important: the 600V, 800V and 1000V versions provide an Iimp rating of 6.25kA, while the 1200V and 1500V versions have lower model-specific impulse ratings.

Iimp, In and Imax Explained for the LDSP1s6.25

The LDSP1s6.25 carries three different discharge-current parameters, and they should not be treated as interchangeable.

Iimp – Impulse Discharge Current

Iimp represents the impulse-current capability specified with a 10/350 μs waveform. It is a defining parameter for the Type 1 function of this Type 1+2 DC SPD.

For this series, Iimp is:

• 6.25kA at 600V DC

• 6.25kA at 800V DC

• 6.25kA at 1000V DC

• 5kA at 1200V DC

• 3kA at 1500V DC

In – Nominal Discharge Current

In is specified with an 8/20 μs waveform. The LDSP1s6.25 series has an In rating of 20kA across the available voltage models.

Imax – Maximum Discharge Current

Imax is also specified with an 8/20 μs waveform. All listed LDSP1s6.25 models have an Imax rating of 50kA.

For product selection, do not compare two SPDs only by the largest kA number shown on the label. SPD type, test waveform, Ucpv, Iimp, In, Imax and Up describe different aspects of surge-protection performance.

3+0 DC Protection Configuration

The LDSP1s6.25 uses a three-module 3+0 arrangement with DC+, PE and DC− connections.

The supplied model data specifies protection paths from the positive and negative DC conductors toward PE. All listed 600–1500V versions use the same 3+0 configuration.

This gives the series a clear application profile for photovoltaic DC protection and also distinguishes it from products available in both 2+0 and 3+0 configurations.

When specifying the SPD, the protection arrangement should be checked together with the PV system voltage, earthing concept and installation design.

Solar PV Applications

The LDSP1s6.25 is designed for surge protection on the DC side of photovoltaic power systems.

Typical applications may include:

• PV combiner boxes

• Solar array DC protection

• DC distribution panels

• Solar inverter DC input circuits

• Commercial rooftop photovoltaic systems

• Industrial PV installations

• High-voltage DC sections of photovoltaic systems up to 1500V DC

The product is particularly relevant where a Type 1+2 DC SPD is required rather than a Type 2-only device.

For projects with different lightning exposure, installation positions or impulse-current requirements, compare the required Iimp rating against the exact LDSP1s6.25 voltage model before ordering.

Pluggable MOV Modules and Status Monitoring

The LDSP1s6.25 uses a pluggable module design, allowing the protective modules to be removed from the base assembly for replacement or maintenance.

Internal thermal disconnection helps isolate a protective element when it reaches an abnormal condition.

A visual indicator provides a simple local status check:

• Green: normal operating condition

• Red: fault or replacement condition

An optional remote signalling contact is available for installations where SPD condition needs to be monitored from a control panel or remote monitoring system.

The technical data specifies a remote contact rating of:

• 250V / 0.5A AC

• 30V / 3A DC

with NC, COM and NO terminals.

Installation and 125A gPV Backup Protection

The LDSP1s6.25 mounts on a standard 35mm DIN rail and accepts main conductors from 2.5mm² to 25mm² through screw terminals. The product data also notes that busbar wiring can be used.

The specified maximum backup fuse is:

125A gPV

The selected backup protection should be coordinated with the actual SPD model and PV system design.

For installation planning, also consider:

• Ucpv of the selected SPD

• DC system configuration

• conductor size

• PE connection

• protection mode

• upstream short-circuit protection

• cable routing and connection length

Installation should be completed by qualified electrical personnel using the confirmed product documentation and project requirements.

OEM & ODM Type 1+2 DC SPD Solutions

YQNT supports OEM and ODM requirements for photovoltaic equipment suppliers, electrical distributors, panel builders and private-label brands.

For the LDSP1s6.25 series, project discussions can include:

• 600–1500V DC model selection

• Product marking and private labels

• Packaging and label customization

• Remote-signalling requirements

• Product documentation

• Target-market labeling

• Order-specific packaging requirements

For a faster product recommendation and quotation, provide your PV system voltage, required Ucpv, required Iimp level, certification market and estimated order quantity.

FAQ

What is the main difference between the LDSP1s6.25 and a Type 2 DC SPD?

The LDSP1s6.25 is classified as a Type 1+2 DC surge protective device. In addition to In and Imax ratings based on an 8/20 μs waveform, it also has a model-specific Iimp rating based on a 10/350 μs waveform.

A Type 2-only SPD is normally characterized primarily by its 8/20 μs discharge-current ratings and does not have the same Type 1 impulse-current classification.

Which LDSP1s6.25 model should I choose for a 1000V PV system?

The series includes the LDSP1s6.25-DC1000 with Ucpv 1000V DC, In 20kA, Imax 50kA, Iimp 6.25kA, Itotal 12.5kA and Up ≤3.8kV.

Final selection should still take the actual maximum PV DC voltage and system design into account.

Does every LDSP1s6.25 model have an Iimp rating of 6.25kA?

No.

The 600V, 800V and 1000V versions are rated at Iimp 6.25kA. The 1200V version is rated at 5kA and the 1500V version at 3kA.

This is why the complete model specification should be checked rather than assuming all voltage variants have identical Type 1 impulse-current capability.

What is the Imax rating?

All listed LDSP1s6.25 models have an Imax rating of 50kA under an 8/20 μs waveform.

What protection configuration does the series use?

The supplied technical data lists a 3+0 configuration for all 600V, 800V, 1000V, 1200V and 1500V models.

Is remote signalling available?

Yes. Remote signalling is optional. The technical data lists NC, COM and NO contacts with a maximum rating of 250V/0.5A AC or 30V/3A DC.

What backup fuse is specified?

The product data specifies a maximum 125A gPV backup fuse.

Is the LDSP1s6.25 suitable for 1500V DC photovoltaic systems?

The series includes an LDSP1s6.25-DC1500 model with Ucpv 1500V DC. Its listed ratings include In 20kA, Imax 50kA, Iimp 3kA, Itotal 6kA and Up ≤5.2kV.

Related Solar DC Surge Protection Products

Need a different protection level for your PV system?

Explore related YQNT solar DC surge protection solutions, including:

• Type 2 Solar PV SPDs for standard surge protection

• Higher-Iimp Type 1+2 DC SPD options

• PV fuse links and gPV fuse protection

• Solar DC circuit protection products

For model selection, send us your DC system voltage, required SPD type, impulse-current requirement and project quantity.