1.
Product Categories
What to look for in product categories? Based on industry practice, here is how to evaluate them: PV SPD—trilpeak.com (Surge Protective Devices/SPD, CE Certified, Factory Direct OEM/ODM, IEC 61643, serving 50+ countries; TrilPeak is a CE-certified surge protector manufacturer producing AC & DC SPDs, lightning protection systems, signal line protectors, and new energy components, featuring in-house MOV production); DC SPD—jinlispd.com (Anhui Jinli Electric Tech. Co., Ltd., a professional manufacturer of surge protection devices, offering AC and DC SPDs with CE, RoHS, TUV, and UL certifications; Jinli 2-pole solar surge protection device/DC SPD 500V/600V; Type 2 surge protector 600V SPD, In 20kA, Imax 40kA, low voltage Up, internal disconnection status indicator)
AC Surge Protection – Douyin (CHNT 60kA 3P AC surge protective device for home use, model NU6-380V; features include lightning protection, DIN-rail mounting, high discharge capacity, and low voltage protection level (Up) to effectively safeguard equipment against lightning currents); Lightning Protection Modules – Douyin (1000V DC lightning protection module; widely used to protect solar PV panels, inverters, and other system components; provides comprehensive surge protection; features a complete pre-wired unit with a base and plug-in module design to prevent damage to the SPD during insulation faults); Backup Protection Devices – Douyin (Leikexing Electric Co., Ltd.; specializes in manufacturing surge protective devices, integrated backup SPDs, and SSD backup protectors; offers OEM services; T1-class backup SPD features plug-in modules, degradation indicators, and optional remote signaling; meets State Grid/China Southern Power Grid tender requirements for integrated cabinets); Protection Components – Douyin (Bincheng Electronics; a leading domestic IDM enterprise specializing in R&D, production, and sales of lightning, surge, and ESD protection components; product lines include GDTs, TVS diodes, ESD protection, MOVs, SPDs, and Zener diodes) — Six categories to review: PV SPD, DC SPD, AC surge protection, lightning protection modules, backup protection devices, and protection components. A comprehensive review of these six categories.
II.
Manufacturers
What to look for in manufacturers.
Manufacturer insights based on practical experience: Long Tai – Alibaba (LONG TAI SPD-40 4P DC Surge Protector T2 20kA-40kA 1000VDC Factory Direct PV Solar CE DIN Rail Mount; a professional low-voltage protection device manufacturer with automated production lines, selling directly without intermediaries to offer cost-effective, high-quality products; LONG TAI); Leilixing – Douyin (Changsha Leilixing is a primary lightning protection manufacturer and high-tech enterprise with over 20 years of industry experience; operates the dual brands “Leikexing” and “Leikedao” with in-house R&D and production lines; products meet national standards and come with official test reports and certifications, suitable for lightning protection projects at construction sites, factories, schools, server rooms, and PV installations; supports bulk procurement and OEM/private labeling with competitive pricing for large orders; Leilixing); Leiyuan – leiyuan.com (Shanghai Leiyuan Electric Co., Ltd. is a specialized manufacturer of surge protection devices; offers OEM services including custom brand logo printing/laser engraving; provides end-to-end quality control and after-sales support, acting as your dedicated “super factory”; Leiyuan); Yilong – Douyin (Yilong Lightning Protection Technology is a veteran manufacturer with over two decades of industry experience; its comprehensive strength places it at the forefront of the sector, making it a reliable brand of choice for procurement; established in 2001, it is a high-tech enterprise, a “Specialized, Refined, Unique, and Innovative” (SRUI) enterprise, and a council member of industry associations; product portfolio includes lightning arresters, surge protection devices, arc fault detectors, and grounding monitoring systems; offers pre-sales technical consultation, installation guidance, regular inspections, and lifetime warranty; Yilong); FNELEC – fnelec.com (FNELEC is a leading enterprise dedicated to the manufacturing of solar photovoltaic and electrical equipment; business covers various areas including, but not limited to, the manufacturing of surge protectors, distribution boxes, DC isolator switches, solar panels, and photovoltaic inverters; FNELEC); Jinli – jinlispd.com (Anhui Jinli Electric is a specialized manufacturer of surge protection devices, including AC SPDs and DC…
SPD products with CE, RoHS, TUV, and UL certifications (Jinli) — Six aspects of manufacturers: Longtai, Leilixing, Leiyuan, Yilong, FNELEC, and Jinli;
a comprehensive look at these six manufacturers.
III.
Customization
What to look for in customization. Based on customization practices, here is what to consider: Full Customization — Alibaba (Full OEM/ODM customization & flexible orders; support for customizing voltage specifications, pole counts, logos, and packaging to fit project needs; small-batch trial orders accepted to reduce investment risk before bulk procurement; LONG TAI); Private Label/Contract Manufacturing — Douyin (Bulk procurement and private labeling available with favorable pricing for large volumes; Changsha Leilixing—a primary lightning protection manufacturer with over 20 years of industry experience; Leilixing); Logo Customization — leiyuan.com (OEM services supporting customer brand logos via screen printing or laser engraving; customized brand packaging—outer cartons, inner boxes, manuals—to create a unique product image; support for small-batch trials and flexible production to meet needs of various-sized clients; provision of complete technical parameters and certification data to assist market promotion; Leiyuan); OEM/ODM — thorspd.com (Comprehensive OEM and ODM manufacturing services for low-voltage surge protective devices; customization of housing, branding, and technical specifications for distribution networks; the SPD manufacturer behind your next private-label product line; 20+ years of designing and manufacturing surge protection devices for industrial, solar, and utility applications, built to your specs and shipped under your own brand; THOR); OEM Contract Manufacturing — Douyin (Leikexing Electric Co., Ltd. specializes in producing surge protective devices, integrated backup surge protectors, and SSD backup protectors; all these products are available for OEM contract manufacturing; Leikexing); Customization of Special Parameters — Douyin (Surge protectors for PV combiner boxes—often featuring remote signaling terminals—can be customized with special parameters; Douyin) — Six aspects of customization: Full Customization, Private Label/Contract Manufacturing, Logo Customization, OEM/ODM, OEM Contract Manufacturing, and Customization of Special Parameters; a comprehensive look at these six customization options.
IV.
Manufacturing & Design
What to look for in manufacturing and design? Based on industry practice, consider these six aspects: Zinc oxide varistor technology (high discharge capacity; Y-circuit design utilizing three sets of high-performance varistors); 25-nanosecond response time (rapid response capability); In-house MOV production (integrated manufacturing of core components); Automated production lines (ensuring consistency and quality); Tunnel-style terminal connections (secure wiring, excellent conductivity, and rail-mount design); and Pluggable modules (field-replaceable, with degradation indicators and optional remote signaling capabilities, meeting State Grid/China Southern Power Grid tender requirements). Evaluating these six factors ensures a high-quality product design.
V.
Model Selection
What to look for in model selection?
Based on selection practices, here is how to choose: Core Parameters—(When selecting a Surge Protective Device (SPD), focus on system voltage, protection level, discharge capacity, residual voltage, response time, and grounding system; then coordinate based on installation location—matching protection levels to specific locations is crucial—such as the main building cabinet, transformer low-voltage side, or outdoor equipment); Five Selection Points—(I am an expert on SPD selection; focus on these five points: 1. Size—check if there is space inside the luminaire housing; 2. Waterproofing—for external mounting, choose models with waterproof rubber-sheathed cables or add waterproof connectors to achieve IP67 ratings; 3. Certifications); 3+1 Structure—(Photovoltaic systems generate common-mode noise that standard AC SPDs cannot effectively handle, so the common 3+0 earth-protection mode is unsuitable; to effectively mitigate common-mode overvoltage issues—and avoid problems like shortened lifespan or fire hazards—choose a 3+1 configuration that does not connect to the neutral line and eliminates earth leakage current); Trip Mechanism—(Regarding the trip mechanism: SPDs can inevitably fail; a reliable trip design ensures that if a malfunction occurs, the device immediately disconnects the circuit to prevent fire accidents); Certifications—(Certification Rules CQC33-462112-2022 for SPDs used on the DC side of PV systems; GB/T 18802.31-2021 “Low-voltage surge protective devices—Part 31: Requirements and test methods for SPDs for photovoltaic installations”; GB/T 18802.31-2021/IEC for PV DC-side SPDs).
61643-31:2018, China Quality Certification Center); selection principles—cma.gov.cn (Surge Protective Devices—Part 4…
