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ZION Solar Accessories · PV Interconnection

MC4 Solar Connector Series — Fast, Secure PV Module Interconnection (IP67 / IP68 Options)

MC4 connectors for residential, commercial, and off-grid solar systems. Designed for outdoor use with low contact resistance, reliable locking, and compatibility with mainstream PV cable sizes (4–6 mm² / 10–12 AWG; higher-capacity variants available).
PV EngineersEPC / ContractorsInstallersProcurementDistributorsO&M
  • Default pick: Standard MC4 pair for 4–6 mm² (10–12 AWG) PV cables, 1000V/1500V options.

  • Utility/high-power: MC4-Evo2 for 1500V and larger cable sizes (e.g., 6–10 mm²).

  • System protection & wiring: Add fuse MC4 or branch connectors (T/Y) to simplify combiner-level layouts.

1) What is an MC4 Solar Connector?

MC4 connectors are the mainstream quick-lock connectors used to connect PV modules in series/parallel and to connect strings to inverters or combiner boxes. For outdoor environments, MC4 connectors are typically designed with weatherproof sealing (commonly IP67 when mated), UV-resistant housing, and low contact resistance to reduce heating at connection points.
Field reality
Most on-site failures come from poor crimp, wrong pin match, or connector incompatibility (mixing non-mating types). The connector is small, but the rework cost is big.

Practical rule
Procure MC4 connectors as a system set: connector + correct pin + seal + correct cable size range + tool kit. Standardize your model list to avoid mixed inventories on site.
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2) Selection List (MC4 Connector Models)

Recommended selection list for procurement and distributor stocking. (For OEM/ODM packaging, branding, and custom kitting, contact ZION.)

ModelDescriptionRated VoltageCable SizeSpecial Features
ZC-MC4-STStandard MC4 male + female pair1000V / 1500V4–6 mm² (10–12 AWG)IP67, UV-resistant, UL & TUV
ZC-MC4-EVO2MC4-Evo2 high-voltage connector1500V6–10 mm²Higher capacity, UL certified
ZC-MC4-T3-1T-Branch connector (3-in-1 parallel combiner)1000V4–6 mm²Compact wiring integration
ZC-MC4-FUSE10MC4 with 10A inline fuse1000V4–6 mm²Built-in fuse for string protection
ZC-MC4-Y2-1Y-Branch (2-to-1, M/FF + F/MM)1000V4–6 mm²Parallel panel wiring
ZC-MC4-TOOLKITMC4 Tool Kit (crimper, stripper, unlock tool)Installer convenience & reliable termination
MC4 Connector Variants

3) Technical Specifications (Typical)

ParameterSpecificationProcurement Note
Rated Voltage1000V DC (IEC) / 1500V DC (UL)Match inverter/string design and local code requirements.
Rated Current20–30 A (depends on cable & pin combination)Current depends on conductor size and contact pin spec.
Insulation MaterialPPO / PC (UV-resistant)Outdoor durability, UV aging resistance.
Contact MaterialTin/silver-plated copper alloyPlating helps reduce resistance and corrosion risk.
Contact Resistance≤ 0.5 mΩLower resistance = less heating at joints.
Protection RatingIP67 (mated), IP2X (unmated)Confirm the rating condition (mated/unmated) in documents.
Temperature Range−40°C to +85°CFor hot rooftops, manage bundling and ventilation.
FlammabilityUL94-V0Common baseline for connector housing FR grade.
Mating Cycles≥ 100 insertions/removalsEnough for install + maintenance operations.
CertificationsIEC 62852, UL 6703, TUV, CE, RoHSConfirm required marks per project and market.

4) Decision Rules / Engineer’s Shortcut

Use this table to decide the model set quickly with fewer RFQ cycles.
Decision TriggerRecommended ModelWhyProcurement Checklist
General rooftop PV / standard string wiringZC-MC4-STMost universal fit for 4–6 mm² PV cable sizesPin size match, seal set, correct crimp tool, rated voltage
1500V high-voltage utility system / larger conductorZC-MC4-EVO2Supports higher voltage and 6–10 mm² cable sizesConfirm cable OD range + torque spec + UL documentation
Need parallel combining without a separate junction boxZC-MC4-T3-1 / ZC-MC4-Y2-1Reduces wiring joints and improves layout speedCheck branch type (2-to-1 vs 3-in-1), polarity configuration
Want string-level overcurrent protectionZC-MC4-FUSE10Inline fuse simplifies protection design for stringsConfirm fuse rating + replacement/service method + certification needs
Multiple sites / installer standardizationZC-MC4-TOOLKITEnsures consistent crimp quality and safe disconnectTool range matches cable sizes; include unlock tool; spare pins/seals if needed

5) Applications & Installation Notes

ApplicationRecommended ItemsInstallation Notes
Residential rooftop PVZC-MC4-ST + ToolkitUse correct crimp + ensure full insertion & audible lock; avoid mixing incompatible connectors.
Commercial PV / distributed generationZC-MC4-ST / ZC-MC4-EVO2 + Branch as neededConfirm voltage class; manage cable routing to avoid over-bending and mechanical stress.
Solar farms / utility scaleZC-MC4-EVO2 + Branch + ToolkitStandardize connector family across the site; document torque/termination SOP to reduce rework risk.
Off-grid / RV / marine solarZC-MC4-ST / ZC-MC4-Y2-1 + ToolkitPrioritize weather sealing; avoid cable over-tightening; keep connectors away from incompatible types.
String protection designZC-MC4-FUSE10Verify fuse rating, service access, and replacement workflow for O&M.

6) Conclusion

The MC4 Solar Connector series is a low-cost component that controls high-cost outcomes: safety, uptime, and rework risk. The best procurement strategy is to standardize on a small set of validated models (Standard MC4 / Evo2 / Branch / Fuse / Toolkit), lock voltage & cable-size compatibility in the PO, and enforce tool-based termination for consistent crimp quality.
FINAL CTA — Request MC4 Connector Datasheet & Quotation
Please share: required model(s), system voltage (1000V/1500V), cable size (mm²/AWG), quantity, packaging/OEM label needs, and delivery destination for accurate pricing.


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