Siemens Miniature circuit breaker, 1-pole, 230/400V, 10kA, 20AProduct Overview The Siemens 5SY4120 7 is a high performance miniature circuit breaker designed for reliable electrical protection in medium current single phase applications. This compact 1 pole circuit breaker features a 20 A current rating with 230 400 V operational voltage and enhanced 10 kA breaking capacity, making it ideal for protecting medium current single phase electrical circuits, heating systems, motor controls, and general purpose
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