A New Benchmark in Waterproof Connection Technology
AOHUA is proud to introduce the LD series waterproof connectors, a new family of circular, threaded-coupling connectors engineered for installations where moisture, dust, vibration and repeated field maintenance are everyday realities. The series comprises three model families — LD16, LD20 and LD24 — which together cover 2 to 9 poles, a rated voltage of 250 V and a rated current range of 5 A to 45 A. Every model shares the same rugged design philosophy: screw-clamp (screw terminal) termination, threaded male–female coupling, nylon housing, brass contacts, IP68 ingress protection, and CE and RoHS certification.
Whether you are extending power and signal cables outdoors, sealing an equipment enclosure, or routing wiring through a control panel, the LD series delivers a connection that is mechanically secure, electrically reliable and genuinely waterproof.
What Are the LD Series Waterproof Connectors?
The LD series waterproof connectors are field-wirable circular connectors that provide dust-tight, watertight termination for low- and medium-current applications up to 45 A. They are offered in two fundamental topologies:
- Wire-to-wire (in-line) assemblies, which join two cable ends for cable extension, repair and quick-disconnect applications.
- Wire-to-board connectors, which terminate cables at equipment panels, enclosures and chassis.
The wire-to-board versions are supplied in four configurations: a rear-mount male panel connector, a rear-mount female panel connector, and panel receptacles with either square-flange or oval-flange profiles. The flange designs provide positive locating against the mounting surface, simplify panel cut-out alignment, and allow the seal to be compressed evenly for a repeatable IP68 seal. The rear-mount arrangement lets installers fix the receptacle from the inside of the enclosure, keeping the live side protected while maintaining a clean, serviceable exterior.
The Product Lineup: LD16, LD20 and LD24
The three model families are sized to match different cable diameters, conductor cross-sections and current demands across the series-wide range of 5 A to 45 A:
- LD16 – the compact entry point of the series, ideal for space-constrained wiring and lower current ratings.
- LD20 – the mid-range family, balancing current capacity with connector footprint for general-purpose power and signal duties.
- LD24 – the largest family, accommodating heavier conductors and the higher end of the current range.
Because the entire series uses an identical termination principle and mating mechanism, specifiers can standardize on one connector system across multiple machine sizes, simplifying inventory, training and spare-part management.
Key Technical Specifications
Table 1 Technical specifications of the LD series waterproof connectors
| Parameter | Specification |
| Model families | LD16, LD20, LD24 |
| Configurations | Wire-to-wire (in-line); wire-to-board (rear-mount male panel, rear-mount female panel, square-flange panel, oval-flange panel) |
| Number of poles | 2 – 9 |
| Rated voltage | 250 V |
| Rated current | 5 A – 45 A (model- and pole-count dependent) |
| Termination method | Screw-clamp (screw terminal) wiring |
| Coupling mechanism | Threaded male–female mating |
| Housing material | Nylon (polyamide) |
| Contact material | Brass |
| Ingress protection | IP68 |
| Certifications | CE, RoHS |
Engineering Features and Functional Benefits
Screw-clamp termination. Each contact is terminated with a screw terminal, so installers need no crimping tools, special dies or hydraulic presses. The screw clamp produces a strong, mechanically firm grip on solid or stranded conductors, permits field re-termination and repair, and holds its clamping force under thermal cycling and vibration. For maintenance teams working on-site, this translates into faster installation and lower tooling cost.
Threaded male–female coupling. The mating halves are secured by a precision thread rather than a push-in latch. The thread provides a high, consistent mating force, prevents accidental disconnection under vibration and shock, and compresses the sealing elements evenly — a prerequisite for a repeatable IP68 seal over hundreds of mating cycles.
IP68 ingress protection. Per IEC 60529, the first digit (6) guarantees complete protection against dust ingress, while the second digit (8) certifies protection against the effects of continuous immersion in water under the conditions specified by the manufacturer. The LD series is therefore suitable for outdoor, washdown, condensation-prone and periodically submerged environments where standard connectors would fail prematurely.
Nylon housing. The polyamide housing offers excellent electrical insulation, good mechanical strength and impact resistance, corrosion resistance against moisture and many industrial chemicals, and a lightweight profile that reduces strain on cables and enclosures.
Brass contacts. Contacts machined from brass — a copper–zinc alloy — combine good electrical conductivity with inherent corrosion resistance, ensuring stable contact resistance and dependable current transfer across the 5 A to 45 A operating window.
Wide electrical envelope. With 2 to 9 poles at 250 V, a single series covers both power circuits and low-voltage signal circuits, reducing the number of connector types a facility must stock.
Applications Across Industries
The LD series waterproof connectors are engineered for any application requiring a dependable, sealed connection in demanding conditions:
- Outdoor and landscape lighting – LED street lights, floodlights, garden and architectural lighting, where water ingress and UV-exposed cable joints are the leading causes of failure.
- Agriculture and irrigation – solenoid valves, irrigation controllers, water pumps and fertigation systems exposed to moisture, soil and washdown.
- Security and surveillance – IP cameras, outdoor sensors and access-control devices requiring weatherproof power and signal connections.
- Industrial automation – sensors, actuators, limit switches and control panels in washdown zones or humid production environments.
- Marine and recreational vehicles – onboard lighting, navigation equipment and auxiliary systems subject to salt-laden air and spray.
- Renewable and low-voltage systems – auxiliary power and monitoring connections in solar installations and off-grid equipment.
- Water handling and treatment – submersible pumps, fountain equipment and treatment plants where connectors are routinely exposed to water.
- Outdoor signage and displays – LED billboards, digital signage and event-stage equipment needing fast, reliable, weatherproof hook-ups.
- Communication infrastructure – low-voltage power and signal links at base stations and outdoor cabinets.
In every case, the screw-clamp termination and threaded coupling reduce installation time, while the IP68 rating removes the need for secondary wrapping, taping or potting at the connection point.
Compliance and Quality Assurance
Every connector in the LD series is CE certified, confirming conformity with the applicable European health, safety and environmental protection directives for electrical equipment, and RoHS compliant, guaranteeing that hazardous substances such as lead, mercury and cadmium are restricted in accordance with EU Directive 2011/65/EU. These certifications support straightforward integration into equipment destined for the European Economic Area and other regulated markets.
Choose the AOHUA LD Series Waterproof Connectors
The AOHUA LD series waterproof connectors combine screw-terminal simplicity, threaded-coupling security, IP68 protection and a 250 V / 5 A–45 A electrical envelope in one standardized family. With LD16, LD20 and LD24 models spanning 2 to 9 poles and wire-to-wire, rear-mount panel, square-flange and oval-flange configurations, the series is ready for outdoor lighting, industrial automation, irrigation, marine and countless other harsh-environment applications.
Contact the AOHUA team today for datasheets, samples and volume pricing — and let the LD series waterproof connectors bring reliable, serviceable waterproof connectivity to your next project.
