MC4 Connector Manufacturer
VIOX Electric is a leading manufacturer and supplier of premium electrical components, specializing in MC4 Solar Connectors. With decades of industry expertise, we deliver connectors that meet the highest standards of safety, reliability, and performance in solar energy systems. Our MC4 connectors ensure secure and efficient connections for photovoltaic arrays, making them essential for solar installers and system integrators. VIOX Electric: your trusted partner for superior solar connection solutions.
Certified By
VIOX Solar DC Connector VOPV Series
VIOX Solar DC Connector VOPV-T Series
VIOX Solar DC Connector VOPV-Y Series
A Brief Self-Nomination: Why Choose VIOX Electric?
At VIOX Electric, we’ve established ourselves as a leading manufacturer of MC4 solar connectors with over 15 years of dedicated experience in the renewable energy sector. Our commitment to quality, innovation, and customer satisfaction has made us the preferred choice for solar installers, system integrators, and distributors worldwide.
What makes VIOX Electric your ideal partner for solar connect solutions?
- Industry-Leading Quality Control: Every connector undergoes rigorous testing to ensure perfect performance under extreme conditions
- Competitive Pricing: Direct manufacturer benefits passed on to our customers
- Global Certification: UL, TÜV, CE, and RoHS compliant products
- Fast Delivery: 15-day lead time on standard orders, expedited options available
- Technical Support: Our application engineers provide comprehensive installation guidance and troubleshooting
- Customization: Ability to tailor products to your specific project requirements
VIOX FULL RANGE of Solar Connetctor
Our comprehensive MC4 connector lineup covers every solar installation need:
- Standard MC4 Solar Connectors
- MC4 Branch Connectors
- MC4 Connector Accessories
- Special Application MC4 Connectors
VIOX MC4 Solar Connector More details presented
Safe to use
Waterproof design uses high-quality raw materials and a high-strength waterproof ring design for a waterproof and dustproof effect.
High-quality waterproof ring
After the convenient buckle connects the positive and negative terminals, the buckle is secure, and the waterproof ring closes to achieve IP67 waterproof rating, allowing for repeated insertion and removal.
Thickened purple copper
Open-type inner core, genuine materials
High-strength PPO material
High heat resistance, wear-resistant, durable, and corrosion-resistant.
VIOX MC4 Solar Connector datasheet
| MODEL NUMBER | TYPE | RATED CURRENT | RATED VOLTAGE | CABLE SIZE | SPECIAL FEATURES |
|---|---|---|---|---|---|
| VOPV-01 | Solar DC Connector | 30A | 1000V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Standard design |
| VOPV-02 | Solar DC Connector | 30A | 1000V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Enhanced grip |
| VOPV-03 | Solar DC Connector | 30A | 1500V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm², 10mm² | Higher voltage rating |
| VOPV-03-1 | Solar DC Connector | 50A | 1500V DC(IEC)/DC(UL) | 10mm² | Higher current capacity |
| VOPV-04 | Solar DC Connector | 30A | 1000V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Compact design |
| VOPV-05 | Solar DC Connector | 30A | 1000V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Panel mount option |
| VOPV-06 | Solar DC Connector | 30A | 1500V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Reinforced housing |
| VOPV-07 | Solar DC Connector | 30A | 1000V DC(IEC)/DC(UL) | 2.5mm², 4mm², 6mm² | Tool-free assembly |
| VOPV-T3 | Branch Connector – 2 way | 50A | 1500V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-T4 | Branch Connector – 3 way | 50A | 1500V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-T5 | Branch Connector – 4 way | 50A | 1500V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-T6 | Branch Connector – 5 way | 50A | 1500V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-T7 | Branch Connector – 6 way | 50A | 1500V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-Y3 | Branch Connector – Y type | 30A | 1000V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-Y4 | Branch Connector – Y type | 30A | 1000V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-Y5 | Branch Connector – Multi-Y | 30A | 1000V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Schottky Diode/PV Fuse |
| VOPV-30A(1000V)-FUSE | Photovoltaic Fuse Connector | 30A | 1000V DC(IEC)/800V DC(UL) | 2.5mm², 4mm², 6mm² | Integrated fuse protection |
VIOX MC4 Solar Connector Step-by-Step Installation
Proper installation ensures maximum safety and performance:
- Tools Required: Wire stripper, MC4 crimping tool, cable cutter, measuring tape
- Safety First: Ensure system is powered down before beginning installation
- Cable Selection: Use only solar-rated PV cable matching connector specifications
- Measure and mark 8mm from cable end
- Carefully strip the insulation without damaging conductor strands
- Inspect for any cut strands which could reduce current capacity
- Insert stripped wire into appropriate metal contact (male or female)
- Position in the correct crimping tool location based on cable size
- Apply firm, even pressure until crimp is complete
- Perform pull test (minimum 80N) to verify secure connection
- Slide connector housing nut and seal onto cable
- Insert crimped contact into connector housing until you hear/feel a “click”
- Verify contact is secured by gentle pulling
- Tighten connector housing nut to manufacturer’s specifications (1.5-2.0 Nm)
- Visually inspect the complete assembly
- Ensure no copper strands are visible outside the connection
- Verify proper alignment before mating connectors
- Connect male and female connectors until fully engaged
- Verify continuity across connections before energizing
- Check polarity to prevent reverse current damage
- Measure resistance across connection points (should be <0.5mΩ)
For detailed installation videos and troubleshooting guidance, visit the Technical Resources section of our website.
Get Your Free MC4 Connector Sample!
We provide samples for free, you just need to tell us what you need
More Than Just a MC4 SOLAR CONNECTOR Manufacturer
At VIOX, we go beyond manufacturing MC4 Solar Connector by offering a suite of value-added services tailored to meet your project needs. Our commitment to excellence ensures that every customer receives personalized attention, expert guidance, and seamless support throughout their journey with us.
Service Consultation
Whether your MC4 Solar Connector requirements are straightforward or complex, our team provides expert advice and technical consultation. For more intricate projects, we offer in-depth engineering support to ensure optimal product selection and application.
Product Recommendations
Unsure which MC4 Solar Connector suits your system? Our specialists provide free, customized recommendations based on your specific operational and environmental requirements, ensuring you get the perfect fit.
Logistics Support
If you lack a reliable freight forwarder, we can arrange transportation from our factory to your project site at no extra cost. Our logistics team ensures timely and secure delivery to keep your project on schedule.
Installation Support
Need help with installation? Our technical team is available to answer your questions or provide hands-on support. For larger projects, we can even dispatch an engineer to your site for on-the-ground assistance.
Frequently Asked Questions
We have compiled some common questions from our clients. If your question isn’t included here, our customer service is always available to help. We’d love to talk with you.
How Can I Get a Quote for the MC4 Solar Connector
To get a quote for our MC4 Solar Connector, contact our customer service team. We are available 24/7. Just provide the specifics of your order like the type, size, and quantity. We’ll guide you through the entire ordering process.
What is Your MOQ for the Order?
We have a low MOQ or minimum order quantity. You can order as little as one unit, and we will deliver according to your specifications.
What Is the Turnaround Time for My Order?
The standard turnaround time for our MC4 Solar Connector is 7 to 10 business days. Delivery time may extend by up to 15 business days due to transit. For custom or bulk orders, we can discuss the turnaround time before finalizing your order.
Can I Get a Sample Before Placing the Order?
Yes, we provide samples for evaluation and approval. Creating samples typically takes 3 to 7 business days.
Can You Make Customized MC4 Solar Connector
Yes, we offer customized MC4 Solar Connector. Let us know your requirements, and our expert customer service team will work with you through the design process.
What is Your Warranty for the MC4 Solar Connector
We offer a 1-year warranty on all MC4 Solar Connector we produce. This ensures we deliver high-quality products. Every product is thoroughly tested before delivery.
KNOWLEDGE About MC4 Solar Connector
What is an MC4 Connector?
MC4 stands for “Multi-Contact, 4 millimeter,” which describes both the manufacturer that developed them and the size of their contact pins. Originally developed by Multi-Contact (now known as Stäubli Electrical Connectors), these connectors have become the de facto standard in the renewable energy industry. The “4” in MC4 refers to the 4mm diameter contact pin, which distinguishes them from their predecessors, MC3 connectors, which featured 3mm pins.
MC4 connectors consist of two complementary parts: male and female connectors that interlock using a snapping mechanism. The male connectors have pins that fit into the corresponding sockets of the female connectors. This two-piece design creates a secure electrical connection while providing protection against environmental hazards
Components of MC4 Connectors
MC4 connectors consist of several essential components that work together to ensure their effectiveness in solar power systems. These include male and female connectors, metal contacts (pins and sockets), rubber sealing rings for waterproofing, and a durable plastic housing resistant to UV radiation and environmental stress. The connectors utilize a crimping system for quick and secure connections, eliminating the need for soldering. This design allows for easy assembly and installation while maintaining the connector’s high performance and reliability in various solar panel configurations.
Key Features of MC4 Connectors
MC4 connectors boast several key features that make them ideal for solar power applications:
IP67-rated weatherproof design, ensuring durability in outdoor environments
UV-resistant construction to withstand prolonged sun exposure
High voltage and current ratings, capable of handling up to 1500V in modern versions
Secure locking mechanism that prevents accidental disconnections and requires a special tool for detachment
Quick and easy installation using a crimping system, eliminating the need for soldering
These features contribute to the connectors’ reliability, safety, and efficiency in solar panel systems, making them a preferred choice for residential, commercial, and industrial PV installations.
How MC4 Connectors Work
MC4 connectors operate on a simple yet effective plug-and-socket design. The male connector features a cylindrical insulator housing a metal contact pin, while the female connector contains a square probe with a metal socket. When connected, the male pin slides into the female socket, creating a secure electrical connection. The connectors incorporate a locking mechanism with two plastic tabs on the socket that snap into notches on the plug, ensuring a tight fit and preventing accidental disconnection.
These connectors are designed for easy hand assembly but require a specialized tool for disconnection, enhancing safety in solar installations. The internal contacts, typically made of tin- or silver-plated copper, ensure excellent conductivity and corrosion resistance. A rubber sealing ring creates a watertight seal between the male and female ends, providing IP67-rated protection against water and dust ingress, crucial for maintaining the integrity of the electrical connection in outdoor environments.
Installation Tools for MC4 Connectors
Installing MC4 connectors requires specific tools to ensure proper assembly and optimal performance. Key tools include:
Wire stripper: For precise removal of cable insulation
MC4 crimping tool: Designed to crimp pins onto 10-14 AWG stranded copper wire, with adjustable pressure settings for consistent crimps
MC4 assembly wrenches: Used for tightening connector housings and ensuring waterproof seals
Release tool: Facilitates safe disconnection of MC4 connectors without damaging components
High-quality crimping tools, such as those with ratcheting mechanisms, ensure uniform crimps and can significantly speed up the installation process. When selecting tools, prioritize those specifically designed for MC4 connectors to maintain system integrity and comply with industry standards.
Solar System Applications
MC4 connectors have found widespread use beyond solar panel systems, thanks to their robust design and reliable performance. In the automotive industry, these connectors are utilized for connecting power supplies, lighting systems, and ground wires. Industrial applications include powering motors and machinery, while marine environments benefit from MC4 connectors for electrical systems, power supplies, and navigation lights.
The versatility of MC4 connectors extends to powering medical equipment, lighting systems in commercial and residential spaces, and connecting renewable energy sources like wind turbines and hydroelectric systems. In urban design, they play a crucial role in building-integrated photovoltaic (BIPV) systems. The consumer electronics industry has also adopted MC4 connectors for connecting laptops, tablets, and other devices to external power supplies, showcasing their adaptability across various sectors.
How to select the right MC4 connectors
When selecting MC4 connectors for a solar power system, consider these key factors:
Voltage and current ratings: Choose connectors rated for at least 1500V DC and 30A to handle the output of modern solar panels.
Compatibility: Ensure connectors match your solar panel and inverter specifications.
Environmental protection: Opt for IP68-rated connectors for maximum dust and water resistance.
Quality certifications: Look for connectors with TÜV Rheinland or UL Listed certifications to ensure safety and performance standards.
Cable size compatibility: Match the connector to your system’s cable gauge, typically 4-6mm² for standard installations.
Always prioritize genuine MC4 connectors from reputable manufacturers over third-party alternatives to ensure reliability and proper system integration.
What are the advantages of using MC4 connectors over other types
MC4 connectors offer several advantages over other types of solar connectors, making them the preferred choice for many solar panel installations:
Standardization: MC4 connectors have become the industry standard, ensuring wide compatibility and availability across various solar installations.
Reliability: These connectors provide secure and dependable connections, reducing the risk of power loss and electrical faults in solar systems.
Easy installation: MC4 connectors feature a plug-and-socket design that allows for quick and straightforward installation, saving time and effort during setup.
Weather resistance: They are designed to be waterproof, dustproof, and UV-resistant, making them suitable for outdoor use in harsh environmental conditions.
Efficiency: MC4 connectors are engineered to minimize power loss and maximize energy transfer from solar panels to the rest of the system.
Durability: Constructed with high-quality materials, MC4 connectors can withstand extreme temperatures and prolonged exposure to the elements.
Safety: They feature a locking mechanism that ensures a secure connection, reducing the risk of accidental disconnection and enhancing overall safety.
Versatility: MC4 connectors are compatible with a wide range of solar panels and inverters, providing flexibility for various system designs1.
Cost-effectiveness: Their widespread use and reliability make MC4 connectors a cost-effective choice for solar installations.
Low maintenance: Once installed, MC4 connectors require minimal maintenance, contributing to the long-term reliability of solar power systems.
These advantages make MC4 connectors a superior choice for most residential and commercial solar installations, offering a balance of reliability, ease of use, and cost-effectiveness compared to other connector types.
How often should I inspect and maintain my MC4 connectors
MC4 connectors should be inspected and maintained regularly to ensure the efficiency and safety of your solar power system. The recommended frequency depends on environmental conditions and usage:
Inspection Frequency:
Inspect MC4 connectors at least every six months under normal conditions.
In harsh environments (e.g., areas with heavy rain, dust, or extreme temperatures), inspections may need to be conducted more frequently, such as every 3-6 months.
For general solar system maintenance, annual inspections are also common practice.
Maintenance Tasks:
Visual Inspection: Check for wear, cracks, corrosion, or loose connections.
Cleaning: Remove dirt, debris, and moisture using a soft cloth or compressed air. Avoid harsh chemicals.
Seal Integrity: Ensure waterproof seals are intact to prevent moisture ingress.
Tighten Connections: Use an MC4 wrench or disconnect tool to secure loose connectors.
Replacement: Replace damaged or worn connectors immediately to avoid system failures.
Regular inspection and maintenance not only prolong the lifespan of MC4 connectors but also enhance the overall performance and safety of your solar system.
What Are the Common Faults and Solutions of MC4 Connectors?
MC4 connectors can develop several common faults that impact solar system performance and safety. Key issues include:
Overheating due to loose connections or high resistance, often caused by inadequate crimping or improper assembly
Poor electrical contact from corrosion, dirt, or improper crimping
Water ingress resulting from failed seals or improper installation
Connector mismatch when mixing different brands or types
Mechanical damage from UV exposure, extreme weather, or rough handling
Solutions involve proper maintenance and timely replacement. Use appropriate crimping tools, verify correct current/voltage ratings, and regularly inspect and clean connectors1. For water ingress, use IP67/IP68-rated connectors and apply dielectric grease. Replace connectors showing burn marks, corrosion, or physical damage immediately. Implementing these measures can prevent power loss, overheating, and safety hazards in solar panel systems.
How do I test the continuity of an MC4 connector
To test the continuity of an MC4 connector, follow these steps:
Disconnect the MC4 connectors from the solar panels and other components to ensure safety.
Set your multimeter to the continuity or resistance (ohms) setting.
Insert the multimeter probes into the male and female MC4 connectors:
Place the red probe in the positive (+) connector
Place the black probe in the negative (-) connector
Check the multimeter reading:
A continuous beep or very low resistance (close to 0 ohms) indicates good continuity
No beep or high resistance suggests a poor connection or faulty connector
Gently wiggle the cables while testing to check for intermittent issues.
If testing a single connector, touch one probe to the metal pin inside the connector and the other to the stripped wire end to verify continuity through the crimp.
For a more thorough test, you can also check for continuity between the positive and negative connectors when mated. Lack of continuity here indicates a good connection, as there should be no electrical path between them.
Remember to perform this test before connecting MC4 connectors to solar panels or charge controllers to ensure a good connection that will last for years. Always prioritize safety by avoiding testing when the sun is shining on the panels or when they’re connected to a battery.
Types of MC4 Connectors
There are several types of MC4 connectors used in solar panel systems:
Standard MC4 Connectors: These are the most common type, featuring male and female connectors for positive and negative leads. They are typically rated for 1000V-1500V and 30A.
MC4 Branch Connectors: These include:
2 Female + 1 Male configuration
1 Female + 2 Male configuration
These allow for parallel connections of solar panels.
Heavy Duty MC4 Connectors: Designed for more demanding applications, these offer enhanced durability.
MC4 Combiners (Multi-Branch Connectors): Available in various configurations (2-in-1, 3-in-1, 4-in-1, etc.), these allow multiple panels or strings to be connected in parallel.
1500V Rated MC4 Connectors: Newer versions designed for higher voltage systems, allowing for longer series strings of solar panels2.
All MC4 connectors share some common features:
Made from UV-resistant and flame-retardant materials (e.g., PPO or PA)
IP67 rated for weather resistance
Locking mechanism for secure connections
Compatible with solar cables of various sizes (typically 2.5mm², 4mm², and 6mm²)
These connectors are designed to provide reliable, efficient, and safe connections in solar panel systems across various environmental conditions.
Yueqing’s Solar Connector Dominance
Yueqing, a city in China’s Zhejiang province, has become a key player in the global MC4 connector market. Manufacturers such as Yueqing VIOX Electric Co., Ltd. have significantly contributed to the region’s growing prominence. These companies utilize their expertise in solar accessories and photovoltaic connectors to establish a competitive edge on the international stage.
Yueqing-based manufacturers have gained recognition through competitive pricing strategies, high production capacities with some factories exceeding 10,000 square meters, and international certifications like CE, TUV, and ISO9001 that ensure quality and compliance. Their strong presence in markets such as Southeast Asia, the Middle East, and Brazil, coupled with a focus on research and development leading to innovative connector designs, has further solidified the city’s role in China’s dominance of the global solar connector market. By 2030, China is expected to account for over 50% of the global market share.
MC4 Connector Production
The manufacturing process of MC4 connectors involves several key stages, combining precision engineering with advanced automation:
Injection molding: The plastic housings are produced using high-performance materials like PPO or PA through injection molding. Manufacturers employ servo-driven machines with multi-cavity molds for high-volume production, ensuring dimensional accuracy and consistency.
Metal contact production: Copper or copper alloy strips undergo stamping and forming processes to create the pins and sockets. These components are then plated with tin or silver for corrosion resistance and optimal conductivity.
Assembly: Automated systems are used to assemble the components, including the insertion of metal contacts into the housings, installation of sealing gaskets, and attachment of locking mechanisms. Specialized machines can tighten cable glands at rates of 900-2000 pieces per hour.
Quality control: Throughout the process, rigorous quality checks are performed, including visual inspections and automated testing to ensure each connector meets stringent performance and safety standards.
This highly automated and precise manufacturing process enables the production of high-quality MC4 connectors that meet the demanding requirements of solar power systems.
Request an MC4 Solar Connector
VIOX Electric is ready to assist you with your OEM MC4 Solar Connector needs. We offer high-quality and cost-effective solutions.
