25kA Type 1 AC Surge Protective Device for Main Distribution Board

Product Overview

This 25kA Type 1 SPD is intended for first-stage AC surge protection where high-energy lightning current must be discharged before it reaches downstream distribution equipment.

Unlike MOV-based Type 2 products, the LDSP1-A25 uses a multi-layer graphite-gap structure. It is designed for Type 1 SPD AC power protection at service entrances, main switchboards and primary distribution panels.

Available voltage ratings and protection modes allow the product to be configured for different electrical networks. For coordinated protection, the Type 1 lightning current arrester should be selected together with suitable downstream Type 2 SPDs.

Key Features

• Type 1 / T1 / Class I AC surge protection

• Iimp 25kA per protection path at 10/350μs

• Multi-layer graphite-gap technology

• Integrated high-energy discharge structure

• 275Vac, 320Vac, 385Vac and 440Vac options

• Six single-phase and three-phase protection modes

• Follow-current rating stated as 100Arms

• Short-circuit current rating stated as 25kA

• Maximum backup fuse stated as 315A gG

• 35mm DIN-rail mounting

• IP20 thermoplastic enclosure

• Suitable for coordinated Type 1 and Type 2 protection systems

Technical Specifications

Voltage Options

Select the Uc rating according to the maximum continuous voltage across the SPD terminals, the network configuration, and the earthing arrangement. Confirm the complete protection mode before ordering.

Model Selection and Protection Modes

Technical Notes

• Iimp is 25kA per listed protection path.

• Iimp Total is the combined value stated in the supplied selection table.

• The / symbol means that no value is provided for that protection path.

• Do not promote a 4+0 configuration as a 100kA Type 1 SPD. The series-level rating remains Iimp 25kA per protection path.

Multi-Layer Graphite Gap Technology

The product uses a multi-layer graphite-gap structure for high-energy lightning-current discharge. This technology separates the LDSP1-A25 from the MOV-based Type 2 AC SPD series used for downstream transient-overvoltage protection.

The integrated graphite-gap design is intended for first-stage protection where a 10/350μs lightning-current impulse must be handled at the incoming distribution level.

Follow Current and Backup Protection

The supplied technical table states a follow-current rating of 100Arms, an Isccr of 25kA and a maximum backup fuse of 315A gG.

Final backup protection must be coordinated with:

• The prospective short-circuit current

• The upstream protective device

• The conductor size

• The electrical network

• The applicable installation requirements

Typical Applications

This Type 1 lightning current arrester is suitable for:

• Building service-entrance panels

• Main distribution boards

• Main electrical switchboards

• Incoming low-voltage feeders

• Industrial main power panels

• Commercial building power distribution

• Facilities with external lightning-protection systems

• First-stage protection before downstream Type 2 SPDs

This product is intended for AC systems. It should not be used as a photovoltaic DC SPD.

OEM, ODM & Private-Label Type 1 SPD Solutions

YQNT supports OEM, ODM and private-label Type 1 SPD production for electrical distributors, panel builders, electrical brands and project suppliers.

Available options may include:

• Private-label logos and product markings

• Customized rating labels and nameplates

• Packaging, barcodes and instruction materials

• Uc and protection-mode combinations

• Product datasheets and catalog materials

• Documentation support within the available test and certification scope

• Selected product-platform customization, subject to technical evaluation

For an accurate proposal, provide the system voltage, required Uc, protection mode, target market, branding requirements, and estimated quantity.

FAQ

What is the impulse-current rating of this Type 1 SPD?

The supplied technical documentation states an Iimp rating of 25kA per protection path under a 10/350μs waveform.

How is this product different from a Type 2 AC SPD?

This is a Type 1 lightning current arrester designed for first-stage protection and 10/350μs impulse-current discharge. Type 2 SPDs are normally selected for downstream 8/20μs transient-overvoltage protection.

What protection technology does it use?

The product uses multi-layer graphite-gap technology rather than the MOV platform used in the LDSP1-40 and LDSP1-100 Type 2 series.

Where is a 25kA Type 1 AC surge protective device installed?

Typical positions include service entrances, main switchboards and main distribution boards. Final installation depends on the lightning-protection concept and electrical network.

Which Uc ratings are available?

The supplied technical table lists 275Vac, 320Vac, 385Vac and 440Vac options.

Which protection modes are available?

Available configurations include 1+0, 2+0, 3+0, 4+0, 1+1 and 3+1.

Does this product include fault indication or remote signalling?

The supplied technical table marks both fault indication and remote signalling as unavailable.

What backup fuse is specified?

The supplied documentation lists a maximum backup fuse of 315A gG. Final coordination must consider the installation short-circuit current and applicable requirements.

Request a Quote for a 25kA Type 1 SPD

Need a 25kA Type 1 AC surge protective device for an incoming power or main-distribution project?

Send us the electrical system and purchasing requirements. We will confirm the suitable Uc rating, protection mode, documentation scope, and customization options before quotation.