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1. Applications: Themaster switchis a rugged switching device according to the IEC standards for hoisting applications. The modular design enables the switching device to be used universally A. It is suitable in AC 380V, 50Hz and DC 220V multi- direction control circuit B. The simulative controller, is suitable in DC for timing, commutating, and signals transfer 2. Working condition: 2.1 Permissible ambient temperature between -30°C to +60°C 2.2 Height no more than 2,000 meters 2.3 The relative humidity does not exceed 85%