One of the more famous early manufacturers of solar connectors was Swiss Multi-contact.
The prospect of new energy products is considerable, so let's take a look at solar photovoltaic connectors.
The first half of the connector "MC" is the abbreviation of this company. The diameters of the connecting hardware of the two main connectors are OD: 4.0mm and OD: 3.0m, so MC4 solar connector and MC3 solar connector It follows.
1. The appearance difference between MC4 solar connector and MC3 solar connector is as follows:
The external dimensions of the MC4 series are much larger than the external dimensions of the MC3 series, which is mainly determined by the structural design. Please refer to our product information
| MC4 PV connector | MC3 PV connector | |
| Product No. | SY-CC4K | SY-CC3A |
| Rated Voltage | TUV1000V DC/UL 600V DC | TUV 1000V |
| Rating Current | 20A-30A | 20A-30A |
| Suitable cable cross setions | 2.5mm2/4.0mm2/6.0mm2 | 2.5mm2/4.0mm2/6.0mm2 |
| Pin dimension | φ4.0mm | φ3.0mm |
| Flame Class | UL94V-0 | UL94 HB |
| Protection class | Class II | Class II |
| Connector Material | PPO | EPTR |
| Degree of protection IP | IP67 | IP67 |
2. The difference in texture between MC4 solar connector and MC3 solar connector is as follows:
MC4 solar connectors are mainly made of hard materials such as PPO, PPE, PC, etc.
![]()
MC3 solar connectors are mainly made of mixed flexible materials such as TPE/EPTR and other mixed materials

Thank you so much for enjoying my article.
IP67 Connectors solar cable connector PV DC connector For Outdoor Harsh Environments
Solar connector Male And Female Solar Connector for Solar PV System / Solar Power Supply
solar collector, solar array connector, water connector with Tin Plated Copper Contact
Stable Performance solar Compatible Connectors For Connecting Solar Panels
Solar Panel solar Diode Connector IP68 With Tin Plated Copper Contact
Solar Wire Connectors , PPO Insulated Solar Panel Connector Plugs
Fuse Connector IP68 For Outdoor Extreme Environments
Multi Contact 4 Inline Fuse Holder Connector For Photovoltaic System
fuse connector and a terminal fitting, fuse connector block
PPO Insulated Waterproof protection solar connector fuse on connector