I. Recommended Core Compliant Products (ETL Certification + LED Indicator)

　　Marinco 3050W-B Sealed Splitter

　　Specifications: 3-foot 10/3 wire gauge, dog-bone molded housing

　　Connections: 50A anti-detachment male connector → dual 30A locking female connectors (press to unlock to prevent accidental touch)

　　Certifications & Indicator: ETL+CSA dual certification, equipped with waterproof LED power indicator (solid green = normal power supply, flashing = poor contact)

　　Protection: IP65 fully sealed, heat shrink tubing + potting process for waterproofing, wide operating temperature range of -40℃~85℃

　　Camping Compatibility: Withstands 1.5-meter drop, UV-resistant housing for sun exposure, compatible with dual-device power supply in RVs

　　Price: $59.99 (RV accessory supplier exclusive, includes 1-year warranty)

　　Progressive Industries 5030SW Smart Splitter

　　Specifications: 18-inch short version (can be equipped with 3 3-foot extension cord, 10AWG copper core

　　Connection: NEMA 14-50P → Dual TT-30R, with grounding detection terminal

　　Certifications and Indicators: ETL certified, three-color LED alarm system (green = normal, yellow = ground fault, red = overload/short circuit)

　　Core Functions: Built-in EMS power monitoring, automatic overload power cut-off (response time < 0.1 seconds), fault code display

　　Protection Performance: IP67 waterproof rating, silicone sealing ring + waterproof cover double protection

　　Price: $89.99 (includes carrying case, lifetime repair support)

　　Camco 55315 Upgraded Waterproof Splitter

　　Specifications: 3-foot 10AWG pure copper wire, STW 1.2mm thick sheath

　　Connection: NEMA 14-50P → Dual TT-30R, screw-type waterproof cover

　　Certifications and Indicators: ETL+CSA certified, added LED load indicator (30A per channel) (Independent output display)

　　Protection performance: IP67 short-term immersion rating, EPDM rubber sealing ring for dust and sand protection

　　Price: (45.99 (increased from the old model) 3, plus indicator light function)

　　II. Key Technical Parameter Description (Focusing on Certification and Indicator Lights)

　　ETL Certification Compliance Points: Must comply with UL62368-1 safety standard. Key components (such as copper wire, insulating sheath, indicator light circuit) must have certification codes. Certification markings must be clearly marked on the casing (format: ETL Listed XXXXXX) to avoid false advertising of "certified components rather than whole machine certification."

　　LED Indicator Function Classification:

　　Basic Level: Single green power indicator (e.g., Camco 55315), only displays overall power supply status;

　　Advanced Level: Branch indicator + fault alarm (e.g., Marinco 3050W-B), can locate single-circuit faults;

　　Intelligent Level: Tri-color alarm + code display (e.g., Progressive Industries 5030SW), supports 6 types of fault diagnosis including grounding, overload, and overvoltage.

　　Protection and Performance Matching:

　　Indicator lights must integrate a waterproof design (e.g., potted and sealed LED modules) to prevent rainwater infiltration and short circuits; wire diameter must be ≥10AWG (ETL's mandatory requirement of 30A current carrying capacity) to ensure stable operation of the indicator light circuit and the main circuit.

　　III. Safety Use and Maintenance Instructions

　　Indicator Light Interpretation and Emergency Handling:

　　Green light off: First check the main power switch, then check the male connector contact of the splitter (you can use fine sandpaper to remove the oxide layer);

　　Red light alarm: Immediately disconnect high-power equipment (such as air conditioners). If the LED continues to flash, check if the grounding is good (refer to Camco's grounding detection function);

　　Indicator light flashing: May be due to load fluctuations (such as compressor starting). If accompanied by overheating, replace with a larger wire gauge (e.g., upgrade to 8AWG).

　　ETL Certification Maintenance:

　　Avoid self-disassembly and modification (this will invalidate the certification). Regularly check if the certification label is intact. If damaged, contact the brand to reissue the test report.

　　Camping Tips:

　　For nighttime use, choose models with LED soft light design (such as Marinco) to avoid glare;

　　For long-term camping, it is recommended to point the indicator lights towards the campsite control panel for easy observation from a distance.

　　IV. Alternative Solutions and Purchase Pitfalls

　　Compliant Alternatives:

　　Short Option: Southwire 20037SW0002 (12-inch, ETL certified, single LED indicator, $34.99);

　　High-Value Option: Generac 6340 Adapter (30A/50A compatible, LED power indicator, ETL certified, $39.99).

　　Common Pitfalls to Avoid:

　　Beware of “ETL Tested” Labels: Look for “ETL Listed” (fully certified), not just “ETL Tested”;

　　Reject Products with No Functional Indicator Lights: Some products only have decorative lights; confirm that the indicator lights reflect the actual circuit status (you can ask the seller for a test video).

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