At LSP, we design AC Surge Protector Devices with one purpose: uncompromising protection for your critical systems. Built on strict IEC/EN 61643-11 standards and modular architecture compatible with 3+1 and 4+0 configurations, our solutions ensure seamless integration wherever protection is needed.
Using premium components from global leaders such as Phoenix Contact—featuring MOV and GDT technologies—our portfolio spans Type 1 SPDs, Type 2 SPDs, and Type 3 SPDs, delivering certified surge protection for every application, from renewable energy and telecom to industrial automation.
LSP ensures long-term reliability while maintaining flexibility and compliance with international standards.
Choosing an AC Surge Protector shouldn’t be a headache. It’s simply about matching your site’s risks to your equipment’s needs. We’ve simplified the technical details below to help you pinpoint the exact configuration for a safe, compliant, and reliable system.
| Current Situation | Quick Selection |
| At the building service entrance, where the SPD needs to withstand high-energy lightning currents | Consider Type 1 or Type 1+2 SPD |
| The building is exposed to direct lightning strikes, or lightning current protection is required at the main power entrance | Select Type 1 / Type 1+2 SPD |
| One SPD is required to provide both lightning current and induced surge protection | Select Type 1+2 SPD |
| At the main or distribution board, primarily protecting against induced lightning and switching surges | Typically select Type 2 SPD |
| Type 1 / Type 1+2 SPD is already installed upstream, and the current installation is at a downstream distribution level | Typically select Type 2 SPD |
| Installed close to sensitive electronic equipment where further reduction of residual overvoltage is required | Select Type 3 or Type 2+3 SPD |
| The main circuit breaker has a relatively low current rating, but the SPD installation location has a high lightning exposure risk | Do not select Type 2 based solely on the main circuit breaker rating; consider the lightning exposure and installation location |
| Unsure how many poles are required | First identify the power system, such as TN-C, TN-S, TT, or IT, then determine the required SPD poles and protection mode |
| Unsure about the SPD operating voltage | Determine the corresponding SPD Uc based on the rated grid voltage Un |
| The SPD Type has been determined, but the specific model is unclear | For detailed model selection, switch to the Model Selection Rules section and select the appropriate model based on the system voltage, power system, number of poles, backup protection, and required surge current capacity. |
Not sure if you need Type 1 or Type 2? Let our team confirm based on your building’s risk profile.
| Recommended Installation Location | Type LPZ / Lightning Exposure Level | Main Circuit Breaker | SPD Backup Protection | TN-S System | TN-C System | TT System | ||||
| MCCB/MCB | Fuse | Single-Phase | Three-Phase | Single-Phase | Three-Phase | Single-Phase | Three-Phase | |||
| Service Entrance / Main Distribution Board | Type 1 LPZ 0A → LPZ 1 | ACB ≥ 630A MCCB: 630A ~ 315A | 200A | 315A ~ 250A | FLP25-275/1(s) | FLP25-275/3(s) | FLP25-275/3(s)+1 | |||
| Service Entrance / Main Distribution Board | Type 1+2 LPZ 0A/0B → LPZ 2 | MCCB: 400A ~ 200A | 125A ~ 100A | 125A | FLP12,5-275/1(s) | FLP12,5-275/3(s) | FLP12,5-275/3(s)+1 | |||
| Service Entrance / Main Distribution Board | Type 1+2 LPZ 0A/0B → LPZ 2 | MCCB: 200A | 80A ~ 50A | 80A | FLP7-275/1(s) | FLP7-275/3(s) | FLP7-275/3(s)+1 | |||
| Main / Sub-Distribution Board | Type 2 LPZ 1 → LPZ 2 | MCCB: 100A ~ 63A | 40A ~ 32A | 40A ~ 32A | SLP40-275/1(s) | SLP40-275/3(s) | SLP40-275/3(s)+1 | |||
| Sub-Distribution / Final Distribution Board | Type 2+3 LPZ 2 → LPZ 3 | MCB: 32A | 20A | 20A | SLP20-275/1(s) | SLP20-275/3(s) | SLP20-275/3(s)+1 | |||
| Final Circuit / Near Sensitive Equipment | Type 3 LPZ 2 → LPZ 3 | / | 16A ~ 10A | 16A ~ 10A | TLP-255/2(s) | / | TLP-255/2(s) | / | TLP-255/2(s) | / |
Provide your system voltage and pole configuration to receive the specific part numbers for your project.
As one of the best surge protector brands, LSP ensures unmatched protection and reliability, safeguarding your electrical systems with superior performance.
Certified with 8/20 waveform and 10/350 waveform tests, our SPD endures In = 20kA (±5 times) and Imax = 40kA (±1 time), ensuring it performs excellently under both lightning and switching surges, offering complete protection to your electrical systems.
Unlike traditional SPDs with basic moisture protection, our MOV encapsulation design prevents moisture infiltration, reducing failure risks and extending lifespan in humid environments, ensuring stable performance.
Our SPD features an internally developed tripping mechanism that isolates and extinguishes arcs, preventing fires and ensuring safe disconnection even under extreme lightning conditions, providing maximum safety for your equipment.
Our Surge Protection Device uses reinforced metal contacts (8 mm × 0.8 mm). This robust design enhances conduction and strength, enabling the device to withstand high surges while ensuring stable, long-term protection for connected equipment.
Benefit from high-precision AC surge protector with robust durability. Features such as fast response mechanisms, optimized clamping voltage, and advanced MOV/GDT components safely redirect surges, extending the lifespan of sensitive equipment while maintaining consistent performance.
We use high-quality MOVs from LKD and GDTs from Vactech to ensure the stability and lightning protection performance of our AC surge protectors.
Robust metal lead pins (0.8 mm thick, 8 mm wide) withstand high electrical potentials without breaking.
Our R&D team’s optimized low-temperature trip mechanism and advanced soldering process enhance arc suppression and fire prevention.
Every AC surge protector undergoes rigorous testing; only devices meeting our standards are approved. All AC Surge Protectors are TUV, CB, and CE certified.
As AC SPD suppliers in China, we continually advance our technology to meet diverse lightning protection needs and deliver the best surge protectors to our customers.
Our manufacturing processes strictly adhere to ISO9001, ensuring compliance and efficiency. Our surge protectors are fully certified with TUV, CB, and CE, guaranteeing superior quality and suitability for global markets.
In the electrical field, we have independent R&D capabilities. Our R&D team, with 20 years of experience, provides technical support to help you realize your technical visions.
Our quality control system integrates advanced testing procedures, including lightning impulse tests and multiple durability evaluations, to ensure SPD reliability under surges, heat, corrosion, and fire risks. Consistency checks on solder durability and unified welding temperatures further guarantee long-term stability and safety.
We offer more to our valued customers! Including high-quality corrugated cardboard packaging, 3D animation materials for marketing, and regulatory and certification support.
We also provide 7-day return and 30-day exchange policy. Shipping costs and duties are covered by us during the warranty period.
Our experienced team manages inventory and production, maintaining a steady stock of materials to handle peak periods. We complete and ship regular orders within 15 days and custom orders within 30 days, maintaining a 96% on-time rate!
Our AC surge protector solutions serve diverse sectors: datacenters, LED systems, security systems, industrial installations, wind turbines, domestic and industrial photovoltaics, solar farms, energy storage, and water treatment facilities.
As surge protector suppliers, we empower multiple industries with customized protection and proven expertise.
An AC surge protector does the same job for your electrical system. In normal conditions it sits quietly and lets power flow through. When a surge arrives, it opens a low-resistance path that diverts the excess voltage to ground, protecting the equipment connected downstream. When the surge passes, it returns to its high-resistance state.
A simple way to understand it: an AC surge protector works like a pressure relief valve on a water pipe.
Metal oxide varistor (MOV). This is the core protection element. A MOV is composed of non-linear zinc oxide grains embedded in a ceramic matrix, connected between metal electrodes. Its resistance drops sharply when the voltage across it exceeds a threshold, allowing it to conduct the surge current and limit the voltage. In surge protectors, MOVs are typically square-shaped for Type 1 and Type 2 designs (where they handle higher energy), and disc-shaped for Type 3 and signal SPDs (where the energy class is lower).
Three core protection technologies appear in low-voltage AC surge protectors: the metal oxide varistor (MOV), the gas discharge tube (GDT), and the graphite spark gap. In modern designs they are usually complementary, each handling a different part of the surge problem. In IEC/EN 61643-11, an SPD built around one of these is classified as voltage-limiting, voltage-switching, or combination type.
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