Railway duty and environmental rating
The 5SY5113-7CC11 is explicitly designed for railway applications, which means it meets the vibration, shock, and temperature extremes common to traction and signaling environments. The operating range spans -40 °C to 75 °C, with humidity derating up to 95% at 55 °C, tapering to 35% at 75 °C. That covers everything from a frozen yard in Siberia to a hot summer day inside a roof-mounted equipment box. Pollution degree 3 and overvoltage category III mean the breaker is rated for the conductive-dust and transient-overvoltage conditions you get in an industrial or traction substation — not just a clean control cabinet. IP20 protection applies only with conductors connected; the terminals themselves are touch-protected.