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Precision-engineered waterproof connectors and terminal blocks for EV charging infrastructure
The rapid global expansion of electric vehicle (EV) infrastructure has placed unprecedented demands on the electrical components that power charging networks. At the heart of every outdoor EV charging station lies a critical yet often overlooked component: the waterproof terminal block. As charging stations are deployed in parking lots, highways, commercial districts, and residential areas worldwide, these components must perform flawlessly in rain, snow, extreme heat, humidity, and corrosive environments — year after year, without failure.
🔌 Key Insight: The global EV charging infrastructure market is projected to exceed USD 100 billion by 2030. Reliable, IP67/IP68-rated waterproof terminal blocks are no longer optional — they are the engineering backbone of every outdoor charging deployment.
A waterproof terminal block for outdoor EV charging must satisfy a complex set of requirements simultaneously: it must provide secure electrical connections capable of handling high-voltage DC or AC power, resist water ingress to IP67 or IP68 standards, endure wide temperature fluctuations from -40°C to +125°C, and maintain structural integrity against vibration, UV radiation, and chemical exposure. Standard industrial terminal blocks simply cannot meet these demands, which is why purpose-engineered waterproof solutions have become a dedicated product category in the EV supply chain.
The EV charging market is experiencing a structural transformation. Governments across North America, Europe, and Asia-Pacific have committed to aggressive EV adoption targets, directly driving investment in public and semi-public charging infrastructure. In the European Union alone, the Alternative Fuels Infrastructure Regulation (AFIR) mandates charging stations every 60 km along major highways by 2025. The United States Bipartisan Infrastructure Law has allocated USD 7.5 billion specifically for EV charging networks. China, already the world's largest EV market, is deploying hundreds of thousands of charging piles annually.
This macro-level investment cascade creates enormous demand for every component in the charging station bill of materials — and waterproof terminal blocks are among the highest-specification items. Tier-1 charging equipment manufacturers such as ABB, Schneider Electric, BTC Power, and domestic Chinese OEMs are actively qualifying new supplier bases capable of meeting stricter IP ratings, higher current capacities (up to 500A for DC fast chargers), and tighter dimensional tolerances demanded by next-generation charger designs.
On the industrial side, fleet electrification — covering logistics trucks, buses, construction equipment, and port machinery — is creating a parallel demand stream for heavy-duty waterproof terminal blocks that can handle even more extreme operating conditions than passenger car chargers. These applications often require custom configurations, multi-pole arrangements, and specialized sealing technologies such as sintered glass hermetic seals.
Not all waterproof terminal blocks are equal. For outdoor EV charging applications, engineers evaluate several critical parameters:
IP67 protection (dust-tight, temporary immersion up to 1m) is the baseline for most outdoor EV chargers. Premium installations near flood-prone areas, coastal environments, or underground parking require IP68 (continuous submersion). Advanced sealing methods include compression O-ring seals, sintered glass hermetic seals for gas-tight connections, and over-molded cable entry systems that eliminate potential leak paths entirely.
Modern AC Level 2 chargers operate at 240V with currents up to 80A. DC fast chargers (DCFC) can reach 1000V DC and 500A. Ultra-fast chargers exceeding 350kW are entering deployment. Terminal blocks must be rated for these parameters with appropriate creepage and clearance distances per IEC 60947 and UL 508 standards, while maintaining their waterproof integrity under thermal cycling caused by load variations.
Outdoor environments subject terminal blocks to UV radiation, ozone, industrial chemicals, road salt, and biological growth. Housing materials must be UV-stabilized thermoplastics (PA66-GF, PBT) or die-cast aluminum alloys with appropriate surface treatments. Contact materials — typically copper alloys with silver, tin, or gold plating — must resist oxidation and maintain low contact resistance over decades of service.
Engineering excellence built into every waterproof terminal block
Full dust-tight and waterproof sealing tested to IEC 60529 standards. Designed for continuous outdoor exposure, rain, snow, and temporary submersion in demanding EV charging environments.
Rated for up to 1000V DC and 500A continuous current. Engineered for both AC Level 2 and DC fast charging applications, including next-generation ultra-fast chargers exceeding 350kW.
Operational from -40°C to +125°C. Thermal cycling resistance ensures consistent electrical performance across arctic winters and desert summers without seal degradation.
Bayonet and circular connector locking mechanisms provide vibration-proof connections. Tested to MIL-STD-810 vibration and shock profiles for long-term reliability in vehicle-adjacent installations.
UV-stabilized housing materials and silver/gold-plated contacts resist oxidation, road salt, ozone, and industrial chemicals. Maintains structural and electrical integrity over 20+ year service lifespans.
Push-in and bayonet locking designs enable rapid field installation and maintenance. Modular configurations support flexible wiring layouts for diverse charging station form factors.
Where waterproof terminal blocks make the critical difference in EV charging infrastructure
High-density urban charging hubs expose electrical components to constant rain, humidity, vandalism risk, and thermal stress from high-cycle usage. IP68-rated waterproof terminal blocks with hermetic glass seals ensure zero moisture ingress even after years of daily exposure. Multi-pole configurations handle the complex power distribution within hub-style charging cabinets serving 10–20 simultaneous vehicles.
Highway charging stations face the harshest conditions: temperature extremes, road salt spray, high-pressure washing during maintenance, and continuous 24/7 operation. Terminal blocks here must meet both IP67 protection and vibration resistance standards. The bayonet locking mechanism of FQC and FQ series connectors provides the mechanical security needed to prevent accidental disconnection during servicing.
Commercial fleet depots charge dozens of electric buses and trucks overnight using high-power overhead pantograph or plug-in systems. These industrial environments involve mechanical vibration from heavy vehicles, exposure to hydraulic fluids, and the need for rapid connector mating cycles. Waterproof circular connectors with robust locking and high current ratings are essential for reliable depot operation.
As electric construction machinery and mining vehicles enter the market, their charging infrastructure must operate in environments with dust, mud, water jets, and extreme mechanical shock. Sintered glass leakproof terminal blocks provide hermetic sealing that standard rubber-sealed products cannot match, maintaining integrity even under high-pressure cleaning and chemical exposure.
Shore power connections for electric ferries and port equipment demand the highest levels of waterproofing and corrosion resistance. Salt-laden marine atmospheres accelerate metal corrosion dramatically. Specialized marine-grade waterproof terminal blocks with stainless steel hardware and conformal-coated electronics provide the long-term reliability that vessel operators require.
Wall-mounted outdoor EV chargers for residential and smart community applications require compact, aesthetically integrated waterproof connections. These installations must handle years of exposure without maintenance. IP67 push-in terminal blocks with UV-resistant housings provide homeowners and property managers with the maintenance-free reliability they expect from modern EV infrastructure.
The evolving demands shaping next-generation waterproof terminal block technology
Next-gen chargers demand terminal blocks rated for 1000V DC / 500A+. New contact geometries and heat-dissipating designs are emerging to handle thermal loads at these power levels without compromising waterproof sealing integrity.
Embedded sensors within waterproof terminal blocks now monitor temperature, contact resistance, and insulation integrity in real-time, feeding data to cloud-based predictive maintenance platforms — enabling zero-downtime charging networks.
Bio-based and recycled thermoplastics with equivalent UV and chemical resistance are entering production. Halogen-free flame retardant formulations align with RoHS, REACH, and emerging circular economy regulations in the EU and beyond.
Vehicle-to-Grid technology requires terminal blocks that handle bidirectional power flow and more complex switching cycles. Enhanced contact durability and tighter impedance matching become critical parameters in V2G-compatible connector designs.
Convergence of IEC, UL, GB, and other regional standards is driving universal IP rating requirements and connector interoperability. Manufacturers with multi-certification capabilities gain significant competitive advantage in global EV supply chains.
Post-pandemic supply chain disruptions have accelerated demand for regional manufacturing of critical EV components. China-based manufacturers with full vertical integration — from raw materials to finished connectors — are strategically positioned to serve both domestic and export markets.
Shandong Longli Electronics is a nationally recognized "Key Little Giant" enterprise — specialized, refined, unique, and innovative — and a provincial-level Gazelle Enterprise, Hidden Champion, and Manufacturing Single Champion in Shandong Province.
The company operates R&D centers in Linyi, Xi'an, and Jinan, with comprehensive third-party service capabilities including testing and inspection services backed by CMA and CNAS certifications.
With over 130 product series spanning military connectors, smart grid connectors, new energy vehicle connectors, railway, mining, petroleum, and marine connectors, Longli's waterproof terminal blocks and circular connectors are engineered to the exact specifications demanded by outdoor EV charging infrastructure worldwide.
Decades of technical excellence powering the future of EV connectivity
The company has undertaken more than 60 research projects, including the Torch Program of the Ministry of Science and Technology, provincial major science and technology projects, and provincial key R&D programs. It has received 25 scientific and technological awards, including provincial science and technology awards and provincial SME technological progress awards.
Over 20 achievements have passed provincial appraisals, with two reaching international advanced levels and twelve achieving domestic leading levels — a testament to the engineering rigor applied to every waterproof terminal block and connector product in the EV charging portfolio.
Awarded Science and Technology Progress, Patent Star Enterprise, and Famous Trademark. Numerous products listed in the National Torch Program — validating technical leadership in waterproof connector innovation.
Over 10 senior engineers and 100 R&D professionals across regional R&D centers and 12 technical departments — continuously advancing waterproof sealing, contact materials, and connector architecture for EV applications.
Certified to ISO9001:2015 & IATF16949:2016, with CQC and MA certifications. Equipped with advanced testing labs and complete quality processes — ensuring every waterproof terminal block meets EV charging industry standards.
Products exported to more than 20 countries. Long-term stable partnerships with military, grid, and new energy clients — providing the supply chain reliability that global EV infrastructure projects demand.
Explore our complete range of IP-rated solutions for outdoor EV charging infrastructure
Partner with Shandong Longli Electronics for IP67/IP68 waterproof terminal blocks and circular connectors engineered for the demands of modern EV charging networks. From design consultation to volume supply — we deliver reliability at every connection point.
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