üSM-A-2: Surge protection device type 3 (class D) to DIN EN 61643-11 (VDE 0675 Part 6-11), fine protection device, for 230/400 V supplies.Intended for use in safety contact sockets ? with audible fault signalling? with 2 wires for passage wiring? with smaller sizes? Y connection Application: can be used for all installation systems
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