I. Core Product Selection Recommendations

　　1. Mainstream Compliant Products

　　In terms of mainstream compliant products, the Furrion FP5230R-SB is a common choice for shore power connection and equipment power conversion scenarios. This product features a 50A RV female connector to 30A marine male connector design, capable of withstanding 600V voltage and 105°C high temperature, equipped with IP protection and a sealing sleeve, certified by Marine UL, with a reference price of USD 81.95. The Blue Sea 7157 is suitable for shunt protection and equipment overload protection scenarios. As a 50A DC circuit breaker, it has an interrupting capacity of 28V/2500A, paired with an IP64 waterproof sleeve, and offers marine-grade corrosion resistance, with a reference price of approximately USD 30. If a low-cost equipment shunting solution is needed, the ZW marine circuit breaker can be selected. This product supports 50~30A current adjustment, has flame-retardant and waterproof performance as well as a manual reset function, with a reference price of CNY 38 per unit, suitable for general scenarios in both automotive and marine applications.

　　2. Key Selection Indicators

　　Current Matching: The 30A output terminal must match the rated current of the equipment, and the circuit breaker setting value is recommended to be ≤ 30A (e.g., Blue Sea 30A model)

　　Protection Level: IP44 is recommended for conventional ships, while IP56 or above is required for speedboats/humid areas

　　Material Requirements: Priority should be given to corrosion-resistant alloy enclosures (e.g., Furrion's anti-corrosion materials) + flame-retardant wiring (10/3 STW specification)

　　II. Mandatory Marine Safety Standards

　　1. Requirements of China Classification Society (CCS)

　　Circuit breakers must comply with the IEC 60947-2 standard and be equipped with free tripping + anti-tripping devices

　　The installation of splitters must not damage the watertightness of bulkheads, and drilling and fixing on watertight structures is prohibited

　　Grounding Requirements: Metal enclosures must be reliably grounded, and the terminal torque must reach 20 in-lb (e.g., Blue Sea products)

　　2. International General Specifications

　　ABYC Standard: Splitters must be marked with rated current/voltage, and the circuit breaker type (Class A non-selective/Class B selective) must match the system

　　Japanese Maritime Regulations: Circuits above 300A must be equipped with automatic circuit breakers, and the protection characteristics must match the thermal capacity of the cables

　　III. Installation and Maintenance Specifications

　　1. Core Installation Steps

　　Location Selection: Choose a well-ventilated and dry area, away from fuel pipelines, with reserved maintenance space

　　Wiring Process: Use 6/3 STW cables for the 50A input terminal and 10/3 STW cables for the 30A output terminal; apply anti-oxidation grease after crimping the core wires

　　Protection Configuration: The circuit breaker must be connected in series with the 30A output terminal, with a distance of ≤ 0.5 meters from the splitter

　　2. Compliance Inspection

　　Verify the tripping characteristics of the circuit breaker: It should trip within 1 hour when overloaded by 125%, and trip instantly when short-circuited by 200%

　　Protection Test: IP64 level must pass the water spray test (e.g., Blue Sea waterproof sleeve)

　　IV. Common Problems and Solutions

　　In practical use, if the circuit breaker trips frequently, first check whether the load exceeds 30A; if the load is normal, replace it with a Class B selective circuit breaker, which is based on the CCS E02 guideline. If poor contact due to connector corrosion occurs, replace with stainless steel locknuts (e.g., Blue Sea accessories) and apply conductive paste, which meets the requirements of marine anti-corrosion standards. When there is no output from shore power conversion, first check the status of the Powersmart™ indicator light, then reset the circuit breaker; this operation refers to the Furrion technical manual.

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