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The modular distribution box is designed to be equipped with devices that protect the customer installation. The 30 mA differential switches for two-phases are designed to protect persons by detecting insulation defects. The AC-type detected faults on the AC component. The A-type detected faults on the AC and DC components. The DC components faults can be produce by some electrical devices. The size of differntial swith is 2 modules. Subdivisional circuit breakers are designed to protect the circuits of the installation. The proposed materials are : - Neutral Phase 230V, - A type C trip curve according to EN 60898-1.