Siemens 5SY4302-8 Circuit Breaker

Siemens 5SY4302-8 is a three-pole SENTRON miniature circuit breaker designed for 400 V AC systems, rated In 2 A with a short‑circuit breaking capacity (Icu) of 10 kA. This 5SY series device provides reliable overcurrent and short‑circuit protection for three‑phase feeders in commercial and industrial panels, safeguarding wiring and connected equipment in control cabinets and distribution boards. It uses a D‑curve tripping characteristic, offering predictable response for inductive loads while remaining tolerant of brief overloads, making it suitable for motors and other equipment that experience transient current surges. The unit is specified for 400 V operation and supports three poles, which ensures simultaneous interruption of all phases in a three‑phase circuit. With In = 2 A and Icu = 10 kA, it accommodates moderate fault currents while maintaining safe disconnection in the event of overloads, helping prevent damage to downstream devices and wiring. The 5SY4302-8 is cataloged under the SENTRON 5SY family and is chosen where a compact, reliable 3P protection device is required for circuits at the 2‑amp level, reflecting Siemens’ emphasis on robust protection for industrial and commercial electrical distributions.