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The LDSP1-100 series is designed to limit transient overvoltages caused by switching operations and indirect lightning effects in AC electrical installations. It is suitable for coordinated surge protection in distribution boards, switchboards and industrial electrical panels.
With an Imax rating of 100kA and four Uc options, the LDSP1-100 gives panel builders and electrical distributors more flexibility when selecting protection for different AC distribution systems.
The integrated construction combines MOV protection elements, thermal disconnection and visual fault indication. An optional changeover contact can provide remote status monitoring in control and building-management systems.
Type 2 AC surge protective device
In 50kA and Imax 100kA
Uc options from 275Vac to 440Vac
MOV voltage-limiting technology
Integrated product structure
Internal thermal disconnection
Red end-of-life fault indication
Optional remote signalling contact
Six protection-mode configurations
Response time of 25ns or less
35mm DIN-rail mounting
IP20 thermoplastic enclosure
Parameter | LDSP1-100 Series |
|---|---|
Product Type | Type 2 AC Surge Protective Device |
SPD Classification | Type 2 / T2 / Class II |
Protection Technology | Metal Oxide Varistor, MOV |
Structure | Integrated |
Nominal AC Voltage, Un | 230Vac |
Nominal Discharge Current, In | 50kA, 8/20μs |
Maximum Discharge Current, Imax | 100kA, 8/20μs |
Maximum Continuous Operating Voltage, Uc | 275 / 320 / 385 / 440Vac |
Voltage Protection Level, Up | ≤2.0kV to ≤2.8kV, depending on model |
Short-Circuit Current Rating, Isccr | 25kA |
Response Time | ≤25ns |
Thermal Disconnection | Built in |
Fault Indication | Red |
Remote Signalling | Optional changeover contact |
Remote Contact Rating | 250Vac / 0.5A; 30Vdc / 3A |
Maximum Remote-Signal Wire Size | 1.5mm² |
Maximum Backup Fuse | 125–160A gG |
Main Terminal Capacity | 2.5–25mm² |
Wiring Method | Screw terminal; busbar connection may be used |
Installation | 35mm DIN rail |
Protection Rating | IP20 |
Operating Temperature | −40°C to +85°C |
Enclosure Material | Thermoplastic, catalog states UL94-V0 |
Approximate Dimensions | 90.5 × 36 × 66.5mm per protection unit |
Reference Standards in Catalog | IEC 61643-11, EN 61643-11, GB/T 18802.11 |
The LDSP1-100 series is available with 275Vac, 320Vac, 385Vac and 440Vac maximum continuous operating voltage options. Protection configurations include 1+0, 2+0, 3+0, 4+0, 1+1 and 3+1.
Select the model according to the system voltage, protection mode and required voltage protection level.
Model | Protection Mode | In | Imax Total | Up: L→PE | Up: L→N | Up: N→PE |
|---|---|---|---|---|---|---|
LDSP1-100-275/1+0 | L/N→PE | 50kA | 100kA | ≤2.0kV | / | ≤2.0kV |
LDSP1-100-275/2+0 | L, N→PE | 50kA | 200kA | ≤2.0kV | / | ≤2.0kV |
LDSP1-100-275/3+0 | L→PE | 50kA | 300kA | ≤2.0kV | / | / |
LDSP1-100-275/4+0 | L,N→PE | 50kA | 400kA | ≤2.0kV | / | ≤2.0kV |
LDSP1-100-275/1+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.0kV | ≤2.0kV |
LDSP1-100-275/3+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.0kV | ≤2.0kV |
LDSP1-100-320/1+0 | L/N→PE | 50kA | 100kA | ≤2.2kV | / | ≤2.0kV |
LDSP1-100-320/2+0 | L, N→PE | 50kA | 200kA | ≤2.2kV | / | ≤2.0kV |
LDSP1-100-320/3+0 | L→PE | 50kA | 300kA | ≤2.2kV | / | / |
LDSP1-100-320/4+0 | L,N→PE | 50kA | 400kA | ≤2.2kV | / | ≤2.0kV |
LDSP1-100-320/1+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.2kV | ≤2.0kV |
LDSP1-100-320/3+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.2kV | ≤2.0kV |
LDSP1-100-385/1+0 | L/N→PE | 50kA | 100kA | ≤2.5kV | / | ≤2.0kV |
LDSP1-100-385/2+0 | L, N→PE | 50kA | 200kA | ≤2.5kV | / | ≤2.0kV |
LDSP1-100-385/3+0 | L→PE | 50kA | 300kA | ≤2.5kV | / | / |
LDSP1-100-385/4+0 | L,N→PE | 50kA | 400kA | ≤2.5kV | / | ≤2.0kV |
LDSP1-100-385/1+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.5kV | ≤2.0kV |
LDSP1-100-385/3+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.5kV | ≤2.0kV |
LDSP1-100-440/1+0 | L/N→PE | 50kA | 100kA | ≤2.8kV | / | ≤2.0kV |
LDSP1-100-440/2+0 | L, N→PE | 50kA | 200kA | ≤2.8kV | / | ≤2.0kV |
LDSP1-100-440/3+0 | L→PE | 50kA | 300kA | ≤2.8kV | / | / |
LDSP1-100-440/4+0 | L,N→PE | 50kA | 400kA | ≤2.8kV | / | ≤2.0kV |
LDSP1-100-440/1+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.8kV | ≤2.0kV |
LDSP1-100-440/3+1 | L→N,N→PE | 50kA | 100kA | / | ≤2.8kV | ≤2.0kV |
The LDSP1-100-385 is the 385Vac version of the LDSP1-100 series. It provides an In rating of 50kA, an Imax rating of 100kA and a voltage protection level of ≤2.5kV.
Available configurations include 1+0, 2+0, 3+0, 4+0, 1+1 and 3+1. The 385Vac version is suitable for compatible low-voltage AC distribution systems where a higher continuous operating voltage margin is required.
The LDSP1-100 Type 2 AC SPD can be used in:
Low-voltage distribution boards
Sub-distribution panels
Commercial electrical switchboards
Industrial control cabinets
Machinery power-distribution panels
Building electrical systems
Equipment power-supply panels
AC-side distribution in solar installations
The product is intended for AC power circuits. It should not be used as a replacement for a photovoltaic DC surge protective device.
YQNT provides OEM and ODM Type 2 AC surge protective device solutions for electrical distributors, panel builders, private-label brands, and project suppliers. For the LDSP1-100 series, we can support both brand customization and application-based product configuration—not just a different logo.
Available options may include:
Private-label logos, model markings and rating labels
Customized nameplates, packaging, barcodes and manuals
275Vac, 320Vac, 385Vac and 440Vac Uc options
1+0, 2+0, 3+0, 4+0, 1+1 and 3+1 protection modes
Optional remote-signalling contacts
Selected housing and appearance options
Product datasheets, catalogs and technical documentation
Document support based on the available test and certification scope
For an accurate proposal, please send us your system voltage, required Uc, protection mode, remote-signal requirement, target market, branding details and estimated order quantity.
We will confirm the suitable LDSP1-100 configuration, customization scope, and quotation before production.
The series has a nominal discharge current, In, of 50kA and a maximum discharge current, Imax, of 100kA. Both values should be specified using the 8/20μs waveform for the Type 2 product.
The LDSP1-100 is a Type 2 AC surge protective device. It is designed for coordinated surge protection in low-voltage AC distribution systems.
The catalog lists 275Vac, 320Vac, 385Vac and 440Vac options. Select the Uc rating according to the actual system voltage and network configuration.
A 4+0 configuration connects four voltage-limiting paths directly to PE. A 3+1 configuration uses three main protection paths together with a separate N-PE protection path. Selection depends on the system and earthing arrangement.
Yes. An optional changeover contact is available for remote status monitoring. The catalog contact rating is 250Vac/0.5A or 30Vdc/3A.
No pluggable-cartridge claim should be made for this series. The catalog describes the LDSP1-100 as an integrated structure with an internal thermal disconnection device.
The catalog lists a maximum backup fuse of 125–160A gG. Final selection must also consider the installation short-circuit current, conductor size, and applicable electrical requirements.
